{"id":21256,"date":"2026-01-08T22:40:56","date_gmt":"2026-01-08T14:40:56","guid":{"rendered":"https:\/\/viox.com\/?p=21256"},"modified":"2026-01-08T22:45:13","modified_gmt":"2026-01-08T14:45:13","slug":"ats-circuit-breaker-coordination-guide-icw-selectivity","status":"publish","type":"post","link":"https:\/\/test.viox.com\/my\/ats-circuit-breaker-coordination-guide-icw-selectivity\/","title":{"rendered":"ATS & Circuit Breaker Coordination Guide: Icw & Selectivity Explained"},"content":{"rendered":"
\n
\"Industrial
\u1015\u102f\u1036 \u1041: VIOX \u1010\u1005\u103a\u1001\u102f\u1000\u102d\u102f \u1000\u103b\u103d\u1019\u103a\u1038\u1000\u103b\u1004\u103a\u1005\u103d\u102c \u1010\u1015\u103a\u1006\u1004\u103a\u1011\u102c\u1038\u1015\u102f\u1036 \u1021\u101c\u102d\u102f\u1021\u101c\u103b\u1031\u102c\u1000\u103a\u101c\u103d\u103e\u1032\u1015\u103c\u1031\u102c\u1004\u103a\u1038\u1001\u101c\u102f\u1010\u103a<\/a> \u1016\u103c\u1014\u1037\u103a\u1016\u103c\u1030\u1038\u101b\u1031\u1038\u1015\u1010\u103a\u101d\u1014\u103a\u1038\u1000\u103b\u1004\u103a\u1010\u103d\u1004\u103a ATS \u1014\u103e\u1004\u1037\u103a upstream protection devices \u1019\u103b\u102c\u1038\u1021\u1000\u103c\u102c\u1038 \u1021\u101b\u1031\u1038\u1000\u103c\u102e\u1038\u101e\u1031\u102c \u101b\u102f\u1015\u103a\u1015\u102d\u102f\u1004\u103a\u1038\u1006\u102d\u102f\u1004\u103a\u101b\u102c \u1006\u1000\u103a\u1005\u1015\u103a\u1019\u103e\u102f\u1000\u102d\u102f \u101e\u101b\u102f\u1015\u103a\u1016\u1031\u102c\u103a\u1011\u102c\u1038\u101e\u100a\u103a\u104b.<\/figcaption><\/figure>\n

\u1021\u1018\u101a\u103a\u1000\u103c\u1031\u102c\u1004\u1037\u103a ATS \u101e\u1010\u103a\u1019\u103e\u1010\u103a\u1001\u103b\u1000\u103a\u1021\u1019\u103b\u102c\u1038\u1005\u102f\u101e\u100a\u103a \u1021\u101b\u1031\u1038\u1000\u103c\u102e\u1038\u101e\u1031\u102c \u100a\u103e\u102d\u1014\u103e\u102d\u102f\u1004\u103a\u1038\u1019\u103e\u102f\u1021\u1001\u103b\u1000\u103a\u1000\u102d\u102f \u101c\u103d\u1032\u1001\u103b\u1031\u102c\u103a\u101b\u101e\u1014\u100a\u103a\u1038<\/h2>\n

\u1021\u101c\u102d\u102f\u1021\u101c\u103b\u1031\u102c\u1000\u103a \u101c\u103d\u103e\u1032\u1015\u103c\u1031\u102c\u1004\u103a\u1038\u1001\u101c\u102f\u1010\u103a (automatic transfer switch) \u1000\u102d\u102f \u101e\u1010\u103a\u1019\u103e\u1010\u103a\u101b\u102c\u1010\u103d\u1004\u103a \u101c\u103b\u103e\u1015\u103a\u1005\u1005\u103a\u1021\u1004\u103a\u1002\u103b\u1004\u103a\u1014\u102e\u101a\u102c\u1021\u1019\u103b\u102c\u1038\u1005\u102f\u101e\u100a\u103a \u1011\u1004\u103a\u101b\u103e\u102c\u1038\u101e\u1031\u102c parameters \u1019\u103b\u102c\u1038\u1016\u103c\u1005\u103a\u101e\u100a\u1037\u103a \u1005\u1009\u103a\u1006\u1000\u103a\u1019\u1015\u103c\u1010\u103a \u101c\u103b\u103e\u1015\u103a\u1005\u102e\u1038\u1000\u103c\u1031\u102c\u1004\u103a\u1038 \u1021\u1006\u1004\u1037\u103a\u101e\u1010\u103a\u1019\u103e\u1010\u103a\u1001\u103b\u1000\u103a\u104a \u101c\u103d\u103e\u1032\u1015\u103c\u1031\u102c\u1004\u103a\u1038\u1001\u103b\u102d\u1014\u103a\u1014\u103e\u1004\u1037\u103a \u1017\u102d\u102f\u1037\u1021\u102c\u1038\u101c\u102d\u102f\u1000\u103a\u1016\u1000\u103a\u100a\u102e\u1019\u103e\u102f\u1010\u102d\u102f\u1037\u1000\u102d\u102f \u1021\u102c\u101b\u102f\u1036\u1005\u102d\u102f\u1000\u103a\u1000\u103c\u101e\u100a\u103a\u104b \u101e\u102d\u102f\u1037\u101e\u1031\u102c\u103a \u1000\u1019\u1039\u1018\u102c\u1010\u1005\u103a\u101d\u103e\u1019\u103a\u1038\u101b\u103e\u102d \u1010\u1015\u103a\u1006\u1004\u103a\u1019\u103e\u102f\u1011\u1031\u102c\u1004\u103a\u1015\u1031\u102b\u1004\u103a\u1038\u1019\u103b\u102c\u1038\u1005\u103d\u102c\u1010\u103d\u1004\u103a \u101d\u103e\u1000\u103a\u1011\u102c\u1038\u101e\u1031\u102c \u1021\u101b\u1031\u1038\u1000\u103c\u102e\u1038\u101e\u1031\u102c \u101c\u1005\u103a\u101f\u102c\u1001\u103b\u1000\u103a\u1010\u1005\u103a\u1001\u102f\u101b\u103e\u102d\u101e\u100a\u103a- upstream circuit breakers \u1019\u103b\u102c\u1038\u1014\u103e\u1004\u1037\u103a ATS \u104f short-circuit \u1001\u1036\u1014\u102d\u102f\u1004\u103a\u101b\u100a\u103a\u1005\u103d\u1019\u103a\u1038\u101b\u100a\u103a\u1000\u103c\u102c\u1038 \u100a\u103e\u102d\u1014\u103e\u102d\u102f\u1004\u103a\u1038\u1019\u103e\u102f \u1021\u102d\u1015\u103a\u1019\u1000\u103a\u1006\u102d\u102f\u1038\u1016\u103c\u1005\u103a\u101e\u100a\u103a\u104b \u1019\u1000\u102d\u102f\u1000\u103a\u100a\u102e\u101e\u1031\u102c \u1000\u102c\u1000\u103d\u101a\u103a\u101b\u1031\u1038\u1021\u1005\u102e\u1021\u1005\u1009\u103a\u101e\u100a\u103a \u1010\u1005\u103a\u1001\u102f\u101c\u102f\u1036\u1038\u1000\u102d\u102f \u101c\u103b\u103e\u1015\u103a\u1005\u1005\u103a\u1019\u102e\u1038\u1016\u103c\u1010\u103a\u1010\u1031\u102c\u1000\u103a\u1001\u103c\u1004\u103a\u1038 \u101e\u102d\u102f\u1037\u1019\u101f\u102f\u1010\u103a \u1005\u1000\u103a\u1015\u1005\u1039\u1005\u100a\u103a\u1038\u1019\u103b\u102c\u1038\u1000\u102d\u102f \u101c\u102f\u1036\u1038\u101d\u1000\u102c\u1000\u103d\u101a\u103a\u101b\u1014\u103a \u1015\u103b\u1000\u103a\u1000\u103d\u1000\u103a\u101e\u1031\u102c\u1021\u1001\u102b \u1024\u1000\u103d\u102c\u101f\u1001\u103b\u1000\u103a\u101e\u100a\u103a \u1018\u1031\u1038\u1025\u1015\u1012\u103a\u1016\u103c\u1005\u103a\u101c\u102c\u101e\u100a\u103a\u104b.<\/p>\n

\u1021\u1013\u102d\u1000\u1015\u103c\u103f\u1014\u102c\u1019\u103e\u102c \u1021\u1015\u103c\u1014\u103a\u1021\u101c\u103e\u1014\u103a\u1021\u1000\u103b\u102d\u102f\u1038\u101e\u1000\u103a\u101b\u1031\u102c\u1000\u103a\u1019\u103e\u102f\u1010\u103d\u1004\u103a \u1010\u100a\u103a\u101b\u103e\u102d\u101e\u100a\u103a\u104b circuit breaker \u101b\u103d\u1031\u1038\u1001\u103b\u101a\u103a\u1014\u102d\u102f\u1004\u103a\u1019\u103e\u102f \u1021\u1019\u103b\u102d\u102f\u1038\u1021\u1005\u102c\u1038\u1019\u103b\u102c\u1038<\/strong>, short-time withstand current (Icw) \u1021\u1006\u1004\u1037\u103a\u101e\u1010\u103a\u1019\u103e\u1010\u103a\u1001\u103b\u1000\u103a\u1019\u103b\u102c\u1038<\/strong>\u1014\u103e\u1004\u1037\u103a ATS fault-current \u1001\u1036\u1014\u102d\u102f\u1004\u103a\u101b\u100a\u103a<\/strong>. \u1021\u1004\u103a\u1002\u103b\u1004\u103a\u1014\u102e\u101a\u102c\u1019\u103b\u102c\u1038\u101e\u100a\u103a \u101b\u103d\u1031\u1038\u1001\u103b\u101a\u103a\u100a\u103e\u102d\u1014\u103e\u102d\u102f\u1004\u103a\u1038\u1019\u103e\u102f\u1000\u102d\u102f \u101b\u101b\u103e\u102d\u101b\u1014\u103a \u101b\u100a\u103a\u101b\u103d\u101a\u103a\u1001\u103b\u1000\u103a\u101b\u103e\u102d\u101b\u103e\u102d \u1021\u1001\u103b\u102d\u1014\u103a\u1014\u103e\u1031\u102c\u1004\u1037\u103a\u1014\u103e\u1031\u1038\u1019\u103e\u102f\u1019\u103b\u102c\u1038\u1016\u103c\u1004\u1037\u103a Category B circuit breakers \u1019\u103b\u102c\u1038\u1000\u102d\u102f \u101e\u1010\u103a\u1019\u103e\u1010\u103a\u101e\u1031\u102c\u1021\u1001\u102b\u104a ATS \u101e\u100a\u103a \u1011\u102d\u102f\u1014\u103e\u1031\u102c\u1004\u1037\u103a\u1014\u103e\u1031\u1038\u1019\u103e\u102f\u1000\u102c\u101c\u1021\u1010\u103d\u1004\u103a\u1038 (\u1019\u103b\u102c\u1038\u101e\u1031\u102c\u1021\u102c\u1038\u1016\u103c\u1004\u1037\u103a \u1019\u102e\u101c\u102e\u1005\u1000\u1039\u1000\u1014\u1037\u103a \u1041\u1040\u1040 \u1019\u103e \u1041 \u1005\u1000\u1039\u1000\u1014\u1037\u103a) \u1021\u1011\u102d \u1021\u1015\u103c\u100a\u1037\u103a\u1021\u101d fault current \u1000\u102d\u102f \u1001\u1036\u1014\u102d\u102f\u1004\u103a\u101b\u100a\u103a\u101b\u103e\u102d\u101b\u1019\u100a\u1037\u103a \u1021\u1001\u103c\u1031\u1021\u1014\u1031\u1010\u1005\u103a\u1001\u102f\u1000\u102d\u102f \u1016\u1014\u103a\u1010\u102e\u1038\u1000\u103c\u101e\u100a\u103a\u104b \u1005\u1036 3-cycle \u1021\u1006\u1004\u1037\u103a\u101e\u1010\u103a\u1019\u103e\u1010\u103a\u1011\u102c\u1038\u101e\u1031\u102c ATS \u101a\u1030\u1014\u1005\u103a\u1019\u103b\u102c\u1038\u101e\u100a\u103a \u1024\u1000\u103c\u102c\u101b\u103e\u100a\u103a\u101e\u1031\u102c fault \u1000\u103c\u102c\u1001\u103b\u102d\u1014\u103a\u1019\u103b\u102c\u1038\u1000\u102d\u102f \u1019\u1001\u1036\u1014\u102d\u102f\u1004\u103a\u101e\u1031\u102c\u1000\u103c\u1031\u102c\u1004\u1037\u103a contact welding\u104a arc \u1015\u103b\u1000\u103a\u1005\u102e\u1038\u1001\u103c\u1004\u103a\u1038 \u101e\u102d\u102f\u1037\u1019\u101f\u102f\u1010\u103a \u101c\u103d\u103e\u1032\u1015\u103c\u1031\u102c\u1004\u103a\u1038\u1001\u101c\u102f\u1010\u103a \u101c\u102f\u1036\u1038\u101d\u1015\u103b\u1000\u103a\u1000\u103d\u1000\u103a\u1001\u103c\u1004\u103a\u1038\u1010\u102d\u102f\u1037\u1000\u102d\u102f \u1016\u103c\u1005\u103a\u1005\u1031\u101e\u100a\u103a\u104b.<\/p>\n

\u1024\u1015\u103c\u100a\u1037\u103a\u1005\u102f\u1036\u101e\u1031\u102c \u101c\u1019\u103a\u1038\u100a\u103d\u103e\u1014\u103a\u1001\u103b\u1000\u103a\u101e\u100a\u103a ATS-breaker \u100a\u103e\u102d\u1014\u103e\u102d\u102f\u1004\u103a\u1038\u1019\u103e\u102f\u1000\u102d\u102f \u1000\u103b\u103d\u1019\u103a\u1038\u1000\u103b\u1004\u103a\u1015\u102d\u102f\u1004\u103a\u1014\u102d\u102f\u1004\u103a\u1005\u103d\u102c \u101c\u102f\u1015\u103a\u1006\u1031\u102c\u1004\u103a\u101b\u1014\u103a\u104a Category A \u1014\u103e\u1004\u1037\u103a B \u1000\u102c\u1000\u103d\u101a\u103a\u101b\u1031\u1038\u1000\u102d\u101b\u102d\u101a\u102c\u1019\u103b\u102c\u1038\u1000\u103c\u102c\u1038 \u1000\u103d\u102c\u1001\u103c\u102c\u1038\u1001\u103b\u1000\u103a\u1000\u102d\u102f \u1014\u102c\u1038\u101c\u100a\u103a\u101b\u1014\u103a\u104a \u1021\u1001\u103b\u102d\u1014\u103a\u1021\u1001\u103c\u1031\u1001\u1036 \u101b\u103d\u1031\u1038\u1001\u103b\u101a\u103a\u1014\u102d\u102f\u1004\u103a\u1019\u103e\u102f \u1021\u1001\u103c\u1031\u1001\u1036\u1019\u1030\u1019\u103b\u102c\u1038\u1000\u102d\u102f \u1019\u103e\u1014\u103a\u1000\u1014\u103a\u1005\u103d\u102c \u1021\u101e\u102f\u1036\u1038\u1001\u103b\u101b\u1014\u103a\u1014\u103e\u1004\u1037\u103a \u101e\u1004\u103a\u104f overcurrent \u1000\u102c\u1000\u103d\u101a\u103a\u101b\u1031\u1038\u1014\u100a\u103a\u1038\u1017\u103b\u1030\u101f\u102c\u1014\u103e\u1004\u1037\u103a \u1000\u102d\u102f\u1000\u103a\u100a\u102e\u101e\u1031\u102c \u101c\u103d\u103e\u1032\u1015\u103c\u1031\u102c\u1004\u103a\u1038\u1001\u101c\u102f\u1010\u103a\u1019\u103b\u102c\u1038\u1000\u102d\u102f \u101e\u1010\u103a\u1019\u103e\u1010\u103a\u101b\u1014\u103a \u101c\u102d\u102f\u1021\u1015\u103a\u101e\u1031\u102c \u1021\u1004\u103a\u1002\u103b\u1004\u103a\u1014\u102e\u101a\u102c\u1021\u1006\u1004\u1037\u103a \u1011\u102d\u102f\u1038\u1011\u103d\u1004\u103a\u1038\u101e\u102d\u1019\u103c\u1004\u103a\u1019\u103e\u102f\u1000\u102d\u102f \u1015\u1031\u1038\u1015\u102b\u101e\u100a\u103a\u104b \u1006\u1031\u1038\u101b\u102f\u1036\u1019\u103b\u102c\u1038\u104a \u1012\u1031\u1010\u102c\u1005\u1004\u103a\u1010\u102c\u1019\u103b\u102c\u1038 \u101e\u102d\u102f\u1037\u1019\u101f\u102f\u1010\u103a \u1021\u101b\u1031\u1038\u1000\u103c\u102e\u1038\u101e\u1031\u102c \u1005\u1000\u103a\u1019\u103e\u102f\u101c\u102f\u1015\u103a\u1004\u1014\u103a\u1038\u1019\u103b\u102c\u1038\u1021\u1010\u103d\u1000\u103a \u1021\u101b\u1031\u1038\u1015\u1031\u102b\u103a\u1005\u103d\u1019\u103a\u1038\u1021\u1004\u103a\u1005\u1014\u1005\u103a\u1019\u103b\u102c\u1038\u1000\u102d\u102f \u101e\u1004\u103a\u1012\u102e\u1007\u102d\u102f\u1004\u103a\u1038\u1006\u103d\u1032\u1014\u1031\u101e\u100a\u103a\u1016\u103c\u1005\u103a\u1005\u1031 \u1021\u101e\u102f\u1036\u1038\u101d\u1004\u103a\u1015\u102b\u101e\u100a\u103a\u104b.<\/p>\n

\u1021\u1015\u102d\u102f\u1004\u103a\u1038 \u1041: Circuit Breaker \u1021\u1019\u103b\u102d\u102f\u1038\u1021\u1005\u102c\u1038\u1019\u103b\u102c\u1038\u1014\u103e\u1004\u1037\u103a Icw \u1021\u1006\u1004\u1037\u103a\u101e\u1010\u103a\u1019\u103e\u1010\u103a\u1001\u103b\u1000\u103a\u1019\u103b\u102c\u1038\u1000\u102d\u102f \u1014\u102c\u1038\u101c\u100a\u103a\u1001\u103c\u1004\u103a\u1038<\/h2>\n

\u1041.\u1041 Category A \u1014\u103e\u1004\u1037\u103a Category B Circuit Breakers: \u100a\u103e\u102d\u1014\u103e\u102d\u102f\u1004\u103a\u1038\u101b\u1031\u1038\u1014\u100a\u103a\u1038\u1017\u103b\u1030\u101f\u102c\u104f \u1021\u1001\u103c\u1031\u1001\u1036\u1021\u102f\u1010\u103a\u1019\u103c\u1005\u103a<\/h3>\n

IEC 60947-2 \u1005\u1036\u1014\u103e\u102f\u1014\u103a\u1038\u101e\u100a\u103a low-voltage circuit breakers \u1019\u103b\u102c\u1038\u1000\u102d\u102f \u104e\u1004\u103a\u1038\u1010\u102d\u102f\u1037\u104f \u100a\u103e\u102d\u1014\u103e\u102d\u102f\u1004\u103a\u1038\u1006\u1031\u102c\u1004\u103a\u101b\u103d\u1000\u103a\u1019\u103e\u102f \u1021\u1015\u103c\u102f\u1021\u1019\u1030\u1000\u102d\u102f \u1006\u102f\u1036\u1038\u1016\u103c\u1010\u103a\u101e\u100a\u1037\u103a \u1021\u1001\u103c\u1031\u1001\u1036 \u1000\u102c\u1000\u103d\u101a\u103a\u101b\u1031\u1038 \u1021\u1019\u103b\u102d\u102f\u1038\u1021\u1005\u102c\u1038 \u1014\u103e\u1005\u103a\u1001\u102f\u1021\u1016\u103c\u1005\u103a \u1015\u102d\u102f\u1004\u103a\u1038\u1001\u103c\u102c\u1038\u1011\u102c\u1038\u101e\u100a\u103a\u104b. Category A circuit breakers \u1019\u103b\u102c\u1038<\/strong> \u1001\u103b\u1000\u103a\u1001\u103b\u1004\u103a\u1038 magnetic trip \u101c\u102f\u1015\u103a\u1006\u1031\u102c\u1004\u103a\u1001\u103b\u1000\u103a\u1019\u103b\u102c\u1038\u1016\u103c\u1004\u1037\u103a \u101c\u102f\u1015\u103a\u1006\u1031\u102c\u1004\u103a\u1015\u103c\u102e\u1038 \u101b\u100a\u103a\u101b\u103d\u101a\u103a\u1001\u103b\u1000\u103a\u101b\u103e\u102d\u101b\u103e\u102d short-time \u1014\u103e\u1031\u102c\u1004\u1037\u103a\u1014\u103e\u1031\u1038\u1019\u103e\u102f\u1000\u102d\u102f \u1019\u1015\u1031\u1038\u1015\u102b\u104b \u1024\u1000\u102d\u101b\u102d\u101a\u102c\u1019\u103b\u102c\u1038\u2014\u1015\u102f\u1036\u1019\u103e\u1014\u103a\u1021\u102c\u1038\u1016\u103c\u1004\u1037\u103a molded-case circuit breakers (MCCBs) \u1014\u103e\u1004\u1037\u103a miniature circuit breakers (MCBs)\u2014\u101e\u100a\u103a fault current \u1000\u102d\u102f \u1010\u103d\u1031\u1037\u101b\u103e\u102d\u101e\u1031\u102c\u1021\u1001\u102b \u1010\u1010\u103a\u1014\u102d\u102f\u1004\u103a\u101e\u1019\u103b\u103e \u1021\u1019\u103c\u1014\u103a\u1006\u102f\u1036\u1038 trip \u1016\u103c\u1005\u103a\u1005\u1031\u101b\u1014\u103a \u1021\u1004\u103a\u1002\u103b\u1004\u103a\u1014\u102e\u101a\u102c\u1019\u103b\u102c\u1038\u1000 \u1012\u102e\u1007\u102d\u102f\u1004\u103a\u1038\u1011\u102f\u1010\u103a\u1011\u102c\u1038\u1015\u103c\u102e\u1038 \u1019\u103b\u102c\u1038\u101e\u1031\u102c\u1021\u102c\u1038\u1016\u103c\u1004\u1037\u103a \u1019\u102e\u101c\u102e\u1005\u1000\u1039\u1000\u1014\u1037\u103a \u1041\u1040-\u1042\u1040 \u1021\u1010\u103d\u1004\u103a\u1038\u1016\u103c\u1005\u103a\u101e\u100a\u103a\u104b Category A breakers \u1019\u103b\u102c\u1038\u101e\u100a\u103a Icw \u1021\u1006\u1004\u1037\u103a\u101e\u1010\u103a\u1019\u103e\u1010\u103a\u1001\u103b\u1000\u103a\u1000\u102d\u102f \u1019\u101e\u101a\u103a\u1006\u1031\u102c\u1004\u103a\u1015\u102b\u104a \u1021\u1018\u101a\u103a\u1000\u103c\u1031\u102c\u1004\u1037\u103a\u1006\u102d\u102f\u101e\u1031\u102c\u103a \u104e\u1004\u103a\u1038\u1010\u102d\u102f\u1037\u1000\u102d\u102f short-circuit currents \u1019\u103b\u102c\u1038\u1000\u102d\u102f \u1001\u1036\u1014\u102d\u102f\u1004\u103a\u101b\u100a\u103a\u101b\u103e\u102d\u101b\u1014\u103a\u1019\u101f\u102f\u1010\u103a\u1018\u1032 \u1016\u103c\u1010\u103a\u1010\u1031\u102c\u1000\u103a\u101b\u1014\u103a \u1012\u102e\u1007\u102d\u102f\u1004\u103a\u1038\u1011\u102f\u1010\u103a\u1011\u102c\u1038\u101e\u1031\u102c\u1000\u103c\u1031\u102c\u1004\u1037\u103a\u1016\u103c\u1005\u103a\u101e\u100a\u103a\u104b.<\/p>\n

\u101e\u1004\u103a\u101e\u100a\u103a motor feeder circuits \u1019\u103b\u102c\u1038\u104a final distribution panels \u1019\u103b\u102c\u1038 \u1014\u103e\u1004\u1037\u103a branch circuit protection \u1019\u103b\u102c\u1038\u1010\u103d\u1004\u103a Category A breakers \u1019\u103b\u102c\u1038\u1000\u102d\u102f \u1021\u101e\u102f\u1036\u1038\u1015\u103c\u102f\u1019\u100a\u103a\u1016\u103c\u1005\u103a\u1015\u103c\u102e\u1038 \u101b\u100a\u103a\u1019\u103e\u1014\u103a\u1038\u1001\u103b\u1000\u103a\u1019\u103e\u102c \u1001\u103b\u1000\u103a\u1001\u103b\u1004\u103a\u1038 fault clearance \u1016\u103c\u1005\u103a\u101e\u100a\u103a\u104b \u1021\u1019\u103c\u1014\u103a\u101c\u102f\u1015\u103a\u1006\u1031\u102c\u1004\u103a\u1014\u102d\u102f\u1004\u103a\u101e\u1031\u102c \u101c\u1000\u1039\u1001\u100f\u102c\u101e\u100a\u103a \u1000\u1031\u1018\u101a\u103a\u1019\u103b\u102c\u1038\u1014\u103e\u1004\u1037\u103a downstream \u1005\u1000\u103a\u1015\u1005\u1039\u1005\u100a\u103a\u1038\u1019\u103b\u102c\u1038\u1000\u102d\u102f thermal \u1014\u103e\u1004\u1037\u103a mechanical \u1016\u102d\u1005\u102e\u1038\u1019\u103e\u102f\u1019\u103e \u1000\u102c\u1000\u103d\u101a\u103a\u1015\u1031\u1038\u101e\u1031\u102c\u103a\u101c\u100a\u103a\u1038 \u100a\u103e\u102d\u1014\u103e\u102d\u102f\u1004\u103a\u1038\u1006\u1031\u102c\u1004\u103a\u101b\u103d\u1000\u103a\u1019\u103e\u102f \u101c\u102d\u102f\u1000\u103a\u101c\u103b\u1031\u102c\u100a\u102e\u1011\u103d\u1031\u1019\u103e\u102f \u1019\u101b\u103e\u102d\u1015\u102b\u104b \u1000\u102c\u1000\u103d\u101a\u103a\u1011\u102c\u1038\u101e\u1031\u102c \u1007\u102f\u1014\u103a\u1021\u1010\u103d\u1004\u103a\u1038 \u1019\u100a\u103a\u101e\u100a\u1037\u103a\u1014\u1031\u101b\u102c\u1010\u103d\u1004\u103a\u1019\u1006\u102d\u102f fault \u1016\u103c\u1005\u103a\u1015\u1031\u102b\u103a\u1015\u102b\u1000 Category A breaker \u101e\u100a\u103a trip \u1016\u103c\u1005\u103a\u101e\u103d\u102c\u1038\u1019\u100a\u103a\u1016\u103c\u1005\u103a\u101e\u100a\u103a\u104b.<\/p>\n

\"Technical
\u1015\u102f\u1036 \u1042: Category A (\u1001\u103b\u1000\u103a\u1001\u103b\u1004\u103a\u1038) \u1014\u103e\u1004\u1037\u103a Category B (\u1014\u103e\u1031\u102c\u1004\u1037\u103a\u1014\u103e\u1031\u1038) breakers \u1019\u103b\u102c\u1038\u1000\u103c\u102c\u1038 \u1021\u1010\u103d\u1004\u103a\u1038\u1015\u102d\u102f\u1004\u103a\u1038 \u1000\u103d\u102c\u1001\u103c\u102c\u1038\u1001\u103b\u1000\u103a\u1019\u103b\u102c\u1038\u1000\u102d\u102f \u1015\u103c\u101e\u1011\u102c\u1038\u101e\u1031\u102c \u1021\u101e\u1031\u1038\u1005\u102d\u1010\u103a \u1014\u100a\u103a\u1038\u1015\u100a\u102c\u1015\u102d\u102f\u1004\u103a\u1038\u1006\u102d\u102f\u1004\u103a\u101b\u102c \u1014\u103e\u102d\u102f\u1004\u103a\u1038\u101a\u103e\u1009\u103a\u1001\u103b\u1000\u103a\u104b \u101b\u103d\u1031\u1038\u1001\u103b\u101a\u103a\u100a\u103e\u102d\u1014\u103e\u102d\u102f\u1004\u103a\u1038\u1019\u103e\u102f\u1021\u1010\u103d\u1000\u103a \u101c\u102d\u102f\u1021\u1015\u103a\u101e\u1031\u102c Category B \u1000\u102d\u101b\u102d\u101a\u102c\u1019\u103b\u102c\u1038\u1010\u103d\u1004\u103a \u1021\u102c\u1038\u1016\u103c\u100a\u1037\u103a\u1011\u102c\u1038\u101e\u1031\u102c contacts \u1019\u103b\u102c\u1038\u1014\u103e\u1004\u1037\u103a \u1014\u103e\u1031\u102c\u1004\u1037\u103a\u1014\u103e\u1031\u1038\u1019\u103e\u102f \u101a\u1014\u1039\u1010\u101b\u102c\u1038\u1019\u103b\u102c\u1038\u1000\u102d\u102f \u1019\u103e\u1010\u103a\u101e\u102c\u1038\u1015\u102b\u104b.<\/figcaption><\/figure>\n

Category B circuit breakers \u1019\u103b\u102c\u1038<\/strong>, \u1006\u1014\u1037\u103a\u1000\u103b\u1004\u103a\u1018\u1000\u103a\u1021\u1014\u1031\u1016\u103c\u1004\u1037\u103a \u1001\u1031\u1010\u103a\u1019\u102e\u101e\u1031\u102c \u1021\u1001\u103b\u102d\u1014\u103a\u1021\u1001\u103c\u1031\u1001\u1036 \u100a\u103e\u102d\u1014\u103e\u102d\u102f\u1004\u103a\u1038\u101b\u1031\u1038\u1014\u100a\u103a\u1038\u1017\u103b\u1030\u101f\u102c\u1019\u103b\u102c\u1038\u1000\u102d\u102f \u101c\u102f\u1015\u103a\u1006\u1031\u102c\u1004\u103a\u1014\u102d\u102f\u1004\u103a\u1005\u1031\u101e\u100a\u1037\u103a \u1001\u103b\u102d\u1014\u103a\u100a\u103e\u102d\u1014\u102d\u102f\u1004\u103a\u101e\u1031\u102c short-time \u1014\u103e\u1031\u102c\u1004\u1037\u103a\u1014\u103e\u1031\u1038\u1019\u103e\u102f \u101c\u102f\u1015\u103a\u1006\u1031\u102c\u1004\u103a\u1001\u103b\u1000\u103a\u1019\u103b\u102c\u1038\u1000\u102d\u102f \u1011\u100a\u1037\u103a\u101e\u103d\u1004\u103a\u1038\u1011\u102c\u1038\u101e\u100a\u103a\u104b \u1024\u1000\u102d\u101b\u102d\u101a\u102c\u1019\u103b\u102c\u1038\u2014\u1021\u1013\u102d\u1000\u1021\u102c\u1038\u1016\u103c\u1004\u1037\u103a air circuit breakers (ACBs) \u1014\u103e\u1004\u1037\u103a \u1021\u1001\u103b\u102d\u102f\u1037\u101e\u1031\u102c \u1005\u103d\u1019\u103a\u1038\u1006\u1031\u102c\u1004\u103a\u101b\u100a\u103a\u1019\u103c\u1004\u1037\u103a\u1019\u102c\u1038\u101e\u1031\u102c MCCBs<\/a>\u2014\u101e\u100a\u103a fault current \u1000\u102d\u102f \u1010\u103d\u1031\u1037\u101b\u103e\u102d\u101e\u1031\u102c\u1021\u1001\u102b 0.05 \u1014\u103e\u1004\u1037\u103a 1.0 \u1005\u1000\u1039\u1000\u1014\u1037\u103a\u1000\u103c\u102c\u1038 \u104e\u1004\u103a\u1038\u1010\u102d\u102f\u1037\u104f trip \u1010\u102f\u1036\u1037\u1015\u103c\u1014\u103a\u1019\u103e\u102f\u1000\u102d\u102f \u101b\u100a\u103a\u101b\u103d\u101a\u103a\u1001\u103b\u1000\u103a\u101b\u103e\u102d\u101b\u103e\u102d \u1014\u103e\u1031\u102c\u1004\u1037\u103a\u1014\u103e\u1031\u1038\u1005\u1031\u101b\u1014\u103a \u1015\u101b\u102d\u102f\u1002\u101b\u1019\u103a\u1015\u103c\u102f\u101c\u102f\u1015\u103a\u1014\u102d\u102f\u1004\u103a\u101e\u100a\u103a\u104b \u1024\u1014\u103e\u1031\u102c\u1004\u1037\u103a\u1014\u103e\u1031\u1038\u1019\u103e\u102f\u1000\u102c\u101c\u101e\u100a\u103a downstream \u1000\u102c\u1000\u103d\u101a\u103a\u101b\u1031\u1038\u1000\u102d\u101b\u102d\u101a\u102c\u1019\u103b\u102c\u1038\u1000\u102d\u102f \u1026\u1038\u1005\u103d\u102c fault \u1019\u103b\u102c\u1038\u1000\u102d\u102f \u101b\u103e\u1004\u103a\u1038\u101c\u1004\u103a\u1038\u1005\u1031\u1015\u103c\u102e\u1038 \u1005\u1005\u103a\u1019\u103e\u1014\u103a\u101e\u1031\u102c \u101b\u103d\u1031\u1038\u1001\u103b\u101a\u103a\u100a\u103e\u102d\u1014\u103e\u102d\u102f\u1004\u103a\u1038\u1019\u103e\u102f\u1000\u102d\u102f \u101b\u101b\u103e\u102d\u1005\u1031\u101e\u100a\u103a\u104b Category B breakers \u1019\u103b\u102c\u1038\u101e\u100a\u103a \u1015\u103b\u1000\u103a\u1005\u102e\u1038\u1019\u103e\u102f\u1019\u101b\u103e\u102d\u1018\u1032 \u1014\u103e\u1031\u102c\u1004\u1037\u103a\u1014\u103e\u1031\u1038\u1019\u103e\u102f\u1000\u102c\u101c\u1021\u1010\u103d\u1004\u103a\u1038 fault current \u1000\u102d\u102f \u1001\u1036\u1014\u102d\u102f\u1004\u103a\u101b\u100a\u103a\u101b\u103e\u102d\u1000\u103c\u1031\u102c\u1004\u103a\u1038 \u1021\u101e\u102d\u1021\u1019\u103e\u1010\u103a\u1015\u103c\u102f\u101e\u100a\u1037\u103a Icw \u1021\u1006\u1004\u1037\u103a\u101e\u1010\u103a\u1019\u103e\u1010\u103a\u1001\u103b\u1000\u103a\u1000\u102d\u102f \u101e\u101a\u103a\u1006\u1031\u102c\u1004\u103a\u101b\u1019\u100a\u103a\u1016\u103c\u1005\u103a\u101e\u100a\u103a\u104b.<\/p>\n\n\n\n\n\n\n\n\n\n\n\n
\u1021\u1004\u103a\u1039\u1002\u102b<\/th>\nCategory A Breakers \u1019\u103b\u102c\u1038<\/th>\nCategory B Breakers \u1019\u103b\u102c\u1038<\/th>\n<\/tr>\n<\/thead>\n
Trip \u101c\u1000\u1039\u1001\u100f\u102c<\/strong><\/td>\n\u1001\u103b\u1000\u103a\u1001\u103b\u1004\u103a\u1038 (10-20ms)<\/td>\n\u1001\u103b\u102d\u1014\u103a\u100a\u103e\u102d\u1014\u102d\u102f\u1004\u103a\u101e\u1031\u102c \u1014\u103e\u1031\u102c\u1004\u1037\u103a\u1014\u103e\u1031\u1038\u1019\u103e\u102f (0.05-1.0s)<\/td>\n<\/tr>\n
Icw \u1021\u1006\u1004\u1037\u103a\u101e\u1010\u103a\u1019\u103e\u1010\u103a\u1001\u103b\u1000\u103a<\/strong><\/td>\n\u1019\u1015\u1031\u1038\u1011\u102c\u1038\u1015\u102b<\/td>\n\u1019\u1016\u103c\u1005\u103a\u1019\u1014\u1031 \u1021\u1006\u1004\u1037\u103a\u101e\u1010\u103a\u1019\u103e\u1010\u103a\u1001\u103b\u1000\u103a<\/td>\n<\/tr>\n
\u1015\u102f\u1036\u1019\u103e\u1014\u103a \u1021\u1019\u103b\u102d\u102f\u1038\u1021\u1005\u102c\u1038\u1019\u103b\u102c\u1038<\/strong><\/td>\nMCB, \u1005\u1036 MCCB<\/td>\nACB, \u1021\u1006\u1004\u1037\u103a\u1019\u103c\u1004\u1037\u103a MCCB<\/td>\n<\/tr>\n
\u1021\u1013\u102d\u1000\u1021\u101e\u102f\u1036\u1038\u1015\u103c\u102f\u1019\u103e\u102f<\/strong><\/td>\nFeeder\/branch circuits \u1019\u103b\u102c\u1038<\/td>\nMain incomers \u1019\u103b\u102c\u1038, bus-tie<\/td>\n<\/tr>\n
\u100a\u103e\u102d\u1014\u103e\u102d\u102f\u1004\u103a\u1038\u101b\u1031\u1038\u1014\u100a\u103a\u1038\u101c\u1019\u103a\u1038<\/strong><\/td>\n\u101c\u103b\u103e\u1015\u103a\u1005\u102e\u1038\u1000\u103c\u1031\u102c\u1004\u103a\u1038 \u1015\u1019\u102c\u100f\u101e\u102c<\/td>\n\u1021\u1001\u103b\u102d\u1014\u103a\u1014\u103e\u1031\u102c\u1004\u1037\u103a\u1014\u103e\u1031\u1038 \u101b\u103d\u1031\u1038\u1001\u103b\u101a\u103a\u1014\u102d\u102f\u1004\u103a\u1019\u103e\u102f<\/td>\n<\/tr>\n
\u1014\u103e\u102d\u102f\u1004\u103a\u1038\u101b\u1000\u102f\u1014\u103a\u1000\u103b\u1005\u101b\u102d\u1010\u103a<\/strong><\/td>\n\u1021\u1031\u102c\u1000\u103a\u1015\u102d\u102f\u1004\u103a\u1038<\/td>\n\u1015\u102d\u102f\u1019\u103c\u1004\u1037\u103a\u1010\u101a\u103a\u104b<\/td>\n<\/tr>\n
\u1021\u101e\u102f\u1036\u1038\u1001\u103b\u1019\u103e\u102f \u101b\u103e\u102f\u1015\u103a\u1011\u103d\u1031\u1038\u1019\u103e\u102f<\/strong><\/td>\n\u101b\u102d\u102f\u1038\u101b\u102d\u102f\u1038\u101b\u103e\u1004\u103a\u1038\u101b\u103e\u1004\u103a\u1038<\/td>\n\u100a\u103e\u102d\u1014\u103e\u102d\u102f\u1004\u103a\u1038\u101b\u1031\u1038 \u101c\u1031\u1037\u101c\u102c\u1019\u103e\u102f \u101c\u102d\u102f\u1021\u1015\u103a\u101e\u100a\u103a<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n

\u1024\u1021\u1001\u103c\u1031\u1001\u1036 \u1000\u103d\u102c\u1001\u103c\u102c\u1038\u1001\u103b\u1000\u103a\u1000\u102d\u102f \u1014\u102c\u1038\u101c\u100a\u103a\u1001\u103c\u1004\u103a\u1038\u101e\u100a\u103a \u1021\u101b\u1031\u1038\u1000\u103c\u102e\u1038\u1015\u102b\u101e\u100a\u103a\u104b ATS \u1010\u1015\u103a\u1006\u1004\u103a\u1019\u103e\u102f\u1019\u103b\u102c\u1038\u1021\u1010\u103d\u1000\u103a circuit protection \u1000\u102d\u102f \u101b\u103d\u1031\u1038\u1001\u103b\u101a\u103a\u1001\u103c\u1004\u103a\u1038<\/a>, \u1021\u1018\u101a\u103a\u1000\u103c\u1031\u102c\u1004\u1037\u103a\u1006\u102d\u102f\u101e\u1031\u102c\u103a breaker \u1021\u1019\u103b\u102d\u102f\u1038\u1021\u1005\u102c\u1038\u101e\u100a\u103a ATS \u1021\u1006\u1004\u1037\u103a\u101e\u1010\u103a\u1019\u103e\u1010\u103a\u1001\u103b\u1000\u103a \u101c\u102d\u102f\u1021\u1015\u103a\u1001\u103b\u1000\u103a\u1019\u103b\u102c\u1038\u1014\u103e\u1004\u1037\u103a \u100a\u103e\u102d\u1014\u103e\u102d\u102f\u1004\u103a\u1038\u1006\u1031\u102c\u1004\u103a\u101b\u103d\u1000\u103a\u1019\u103e\u102f \u101b\u103e\u102f\u1015\u103a\u1011\u103d\u1031\u1038\u1019\u103e\u102f\u1000\u102d\u102f \u1010\u102d\u102f\u1000\u103a\u101b\u102d\u102f\u1000\u103a\u1006\u102f\u1036\u1038\u1016\u103c\u1010\u103a\u101e\u1031\u102c\u1000\u103c\u1031\u102c\u1004\u1037\u103a\u1016\u103c\u1005\u103a\u101e\u100a\u103a\u104b.<\/p>\n

\u1041.\u1042 Icw (Short-Time Withstand Current) \u1006\u102d\u102f\u101e\u100a\u103a\u1019\u103e\u102c \u1021\u1018\u101a\u103a\u1014\u100a\u103a\u1038\u104b<\/h3>\n

\u1021\u1006\u1004\u1037\u103a\u101e\u1010\u103a\u1019\u103e\u1010\u103a\u1011\u102c\u1038\u101e\u1031\u102c \u1010\u102d\u102f\u1010\u1031\u102c\u1004\u103a\u1038\u101e\u1031\u102c\u1021\u1001\u103b\u102d\u1014\u103a \u1001\u1036\u1014\u102d\u102f\u1004\u103a\u101b\u100a\u103a\u101b\u103e\u102d\u101e\u1031\u102c \u101c\u103b\u103e\u1015\u103a\u1005\u102e\u1038\u1000\u103c\u1031\u102c\u1004\u103a\u1038 (Icw)<\/strong> Category B circuit breaker \u101e\u100a\u103a tripping \u101e\u102d\u102f\u1037\u1019\u101f\u102f\u1010\u103a thermal \u101e\u102d\u102f\u1037\u1019\u101f\u102f\u1010\u103a electrodynamic \u1015\u103b\u1000\u103a\u1005\u102e\u1038\u1019\u103e\u102f\u1000\u102d\u102f \u1019\u1001\u1036\u1005\u102c\u1038\u101b\u1018\u1032 \u101e\u1010\u103a\u1019\u103e\u1010\u103a\u1011\u102c\u1038\u101e\u1031\u102c \u1000\u103c\u102c\u1001\u103b\u102d\u1014\u103a\u1021\u1010\u103d\u1000\u103a \u101e\u101a\u103a\u1006\u1031\u102c\u1004\u103a\u1014\u102d\u102f\u1004\u103a\u101e\u1031\u102c \u1021\u1019\u103c\u1004\u1037\u103a\u1006\u102f\u1036\u1038 RMS symmetrical short-circuit current \u1000\u102d\u102f \u1000\u102d\u102f\u101a\u103a\u1005\u102c\u1038\u1015\u103c\u102f\u101e\u100a\u103a\u104b IEC 60947-2 \u101e\u100a\u103a 0.05, 0.1, 0.25, 0.5 \u1014\u103e\u1004\u1037\u103a 1.0 \u1005\u1000\u1039\u1000\u1014\u1037\u103a\u104f \u1005\u1036\u1005\u1019\u103a\u1038\u101e\u1015\u103a\u1019\u103e\u102f \u1000\u103c\u102c\u1001\u103b\u102d\u1014\u103a\u1019\u103b\u102c\u1038\u1000\u102d\u102f \u101e\u1010\u103a\u1019\u103e\u1010\u103a\u1011\u102c\u1038\u1015\u103c\u102e\u1038 breaker \u101e\u100a\u103a contact \u101a\u102d\u102f\u101a\u103d\u1004\u103a\u1038\u1019\u103e\u102f\u104a insulation \u1015\u103b\u1000\u103a\u1000\u103d\u1000\u103a\u1019\u103e\u102f \u101e\u102d\u102f\u1037\u1019\u101f\u102f\u1010\u103a mechanical \u1015\u102f\u1036\u1015\u103b\u1000\u103a\u1001\u103c\u1004\u103a\u1038\u1021\u1010\u103d\u1000\u103a \u1005\u1031\u102c\u1004\u1037\u103a\u1000\u103c\u100a\u1037\u103a\u1014\u1031\u1005\u1009\u103a fault \u1010\u1005\u103a\u101c\u103b\u103e\u1031\u102c\u1000\u103a\u101c\u102f\u1036\u1038 \u1015\u102d\u1010\u103a\u1011\u102c\u1038\u101e\u100a\u103a\u104b.<\/p>\n

\"Close-up
\u1015\u102f\u1036 \u1043: contact assembly \u1014\u103e\u1004\u1037\u103a arc quenching chambers \u1019\u103b\u102c\u1038\u104f \u1021\u101e\u1031\u1038\u1005\u102d\u1010\u103a\u1019\u103c\u1004\u103a\u1000\u103d\u1004\u103a\u1038\u104b \u1024\u1021\u1005\u102d\u1010\u103a\u1021\u1015\u102d\u102f\u1004\u103a\u1038\u1019\u103b\u102c\u1038\u101e\u100a\u103a short-time withstand (Icw) \u1000\u102c\u101c\u1021\u1010\u103d\u1004\u103a\u1038 \u1015\u103c\u1004\u103a\u1038\u1011\u1014\u103a\u101e\u1031\u102c thermal (I2<\/sup>t) \u1014\u103e\u1004\u1037\u103a electrodynamic \u1016\u102d\u1005\u102e\u1038\u1019\u103e\u102f\u1019\u103b\u102c\u1038\u1000\u102d\u102f \u1001\u1036\u1014\u102d\u102f\u1004\u103a\u101b\u100a\u103a\u101b\u103e\u102d\u101b\u1019\u100a\u103a\u104b.<\/figcaption><\/figure>\n

\u1024\u1001\u1036\u1014\u102d\u102f\u1004\u103a\u101b\u100a\u103a\u101b\u103e\u102d\u101e\u1031\u102c \u1000\u102c\u101c\u1021\u1010\u103d\u1004\u103a\u1038 \u101b\u102f\u1015\u103a\u1015\u102d\u102f\u1004\u103a\u1038\u1006\u102d\u102f\u1004\u103a\u101b\u102c \u1016\u102d\u1005\u102e\u1038\u1019\u103e\u102f\u1019\u103b\u102c\u1038\u101e\u100a\u103a \u1021\u101c\u103d\u1014\u103a\u1015\u103c\u1004\u103a\u1038\u1011\u1014\u103a\u101e\u100a\u103a\u104b Thermally \u1021\u101b\u1006\u102d\u102f\u101c\u103b\u103e\u1004\u103a fault current \u101e\u100a\u103a I2<\/sup>t \u1005\u103d\u1019\u103a\u1038\u1021\u1004\u103a\u1000\u102d\u102f \u1011\u102f\u1010\u103a\u1015\u1031\u1038\u1015\u103c\u102e\u1038 \u101c\u103b\u103e\u1015\u103a\u1005\u102e\u1038\u1000\u103c\u1031\u102c\u1004\u103a\u1038\u104f \u1014\u103e\u1005\u103a\u1011\u1015\u103a\u1000\u102d\u1014\u103a\u1038\u1014\u103e\u1004\u1037\u103a \u1021\u1001\u103b\u102d\u1014\u103a\u1014\u103e\u1004\u1037\u103a\u1021\u100a\u102e \u101c\u103b\u103e\u1015\u103a\u1000\u1030\u1038\u1015\u1005\u1039\u1005\u100a\u103a\u1038\u1019\u103b\u102c\u1038\u104a contacts \u1019\u103b\u102c\u1038\u1014\u103e\u1004\u1037\u103a busbars \u1019\u103b\u102c\u1038\u1000\u102d\u102f \u1021\u1015\u1030\u1015\u1031\u1038\u101e\u100a\u103a\u104b 0.5 \u1005\u1000\u1039\u1000\u1014\u1037\u103a\u1000\u103c\u102c\u1021\u1031\u102c\u1004\u103a \u1011\u102d\u1014\u103a\u1038\u1011\u102c\u1038\u101e\u1031\u102c 50kA fault \u101e\u100a\u103a \u1015\u1005\u1039\u1005\u100a\u103a\u1038\u1021\u1015\u1030\u1001\u103b\u102d\u1014\u103a \u1000\u1014\u1037\u103a\u101e\u1010\u103a\u1001\u103b\u1000\u103a\u1011\u1000\u103a \u1019\u1000\u103b\u1031\u102c\u103a\u101c\u103d\u1014\u103a\u1018\u1032 \u1005\u102f\u1015\u103a\u101a\u1030\u101b\u1019\u100a\u1037\u103a thermal \u1005\u103d\u1019\u103a\u1038\u1021\u1004\u103a 1,250 MJ\/s \u1000\u102d\u102f \u1011\u102f\u1010\u103a\u1015\u1031\u1038\u101e\u100a\u103a\u104b Electrodynamically \u1021\u101b\u1006\u102d\u102f\u101c\u103b\u103e\u1004\u103a fault currents \u1019\u103b\u102c\u1038\u1019\u103e \u1011\u102f\u1010\u103a\u1015\u1031\u1038\u101e\u1031\u102c \u101e\u1036\u101c\u102d\u102f\u1000\u103a\u1005\u1000\u103a\u1000\u103d\u1004\u103a\u1038\u1019\u103b\u102c\u1038\u101e\u100a\u103a \u1019\u102e\u1010\u102c\u101c\u103b\u103e\u1004\u103a \u1010\u1014\u103a\u1001\u103b\u102d\u1014\u103a\u1019\u103b\u102c\u1038\u1005\u103d\u102c\u1011\u1000\u103a \u1000\u103b\u1031\u102c\u103a\u101c\u103d\u1014\u103a\u1014\u102d\u102f\u1004\u103a\u101e\u1031\u102c parallel conductors \u1019\u103b\u102c\u1038\u1000\u103c\u102c\u1038 \u1010\u103d\u1014\u103a\u1038\u101c\u103e\u1014\u103a\u1021\u102c\u1038\u1019\u103b\u102c\u1038\u1000\u102d\u102f \u1016\u1014\u103a\u1010\u102e\u1038\u1015\u1031\u1038\u101e\u100a\u103a\u2014\u1011\u102d\u102f\u1021\u102c\u1038\u1019\u103b\u102c\u1038\u101e\u100a\u103a busbars \u1019\u103b\u102c\u1038\u1000\u102d\u102f \u1019\u1000\u103d\u1031\u1038\u1005\u1031\u101b \u101e\u102d\u102f\u1037\u1019\u101f\u102f\u1010\u103a contact assemblies \u1019\u103b\u102c\u1038\u1000\u102d\u102f \u1019\u1015\u103b\u1000\u103a\u1005\u102e\u1038\u1005\u1031\u101b\u1015\u102b\u104b.<\/p>\n

ATS \u100a\u103e\u102d\u1014\u103e\u102d\u102f\u1004\u103a\u1038\u1019\u103e\u102f\u1021\u1010\u103d\u1000\u103a Icw \u1021\u101b\u1031\u1038\u1000\u103c\u102e\u1038\u101b\u101e\u100a\u1037\u103a \u1021\u1000\u103c\u1031\u102c\u1004\u103a\u1038\u101b\u1004\u103a\u1038<\/strong>: downstream feeders \u1019\u103b\u102c\u1038\u1014\u103e\u1004\u1037\u103a \u101b\u103d\u1031\u1038\u1001\u103b\u101a\u103a\u1014\u102d\u102f\u1004\u103a\u1019\u103e\u102f\u1000\u102d\u102f \u101b\u101b\u103e\u102d\u101b\u1014\u103a 0.2-\u1005\u1000\u1039\u1000\u1014\u1037\u103a short-time \u1014\u103e\u1031\u102c\u1004\u1037\u103a\u1014\u103e\u1031\u1038\u1019\u103e\u102f\u1016\u103c\u1004\u1037\u103a upstream Category B breaker \u1000\u102d\u102f \u101e\u1004\u103a configure \u101c\u102f\u1015\u103a\u101e\u1031\u102c\u1021\u1001\u102b\u104a ATS \u1021\u1015\u102b\u1021\u101d\u1004\u103a \u1005\u102e\u1038\u101b\u102e\u1038\u101b\u103e\u102d \u1000\u102d\u101b\u102d\u101a\u102c\u1010\u102d\u102f\u1004\u103a\u1038\u101e\u100a\u103a \u1011\u102d\u102f\u1014\u103e\u1031\u102c\u1004\u1037\u103a\u1014\u103e\u1031\u1038\u1019\u103e\u102f\u1010\u1005\u103a\u1001\u102f\u101c\u102f\u1036\u1038\u1021\u1010\u103d\u1000\u103a fault current \u1000\u102d\u102f \u1001\u1036\u1014\u102d\u102f\u1004\u103a\u101b\u100a\u103a\u101b\u103e\u102d\u101b\u1019\u100a\u103a\u1016\u103c\u1005\u103a\u101e\u100a\u103a\u104b 0.5s \u1021\u1010\u103d\u1000\u103a Icw = 42kA \u1016\u103c\u1004\u1037\u103a \u1021\u1006\u1004\u1037\u103a\u101e\u1010\u103a\u1019\u103e\u1010\u103a\u1011\u102c\u1038\u101e\u1031\u102c breaker \u101e\u100a\u103a \u1010\u1005\u103a\u101d\u1000\u103a\u1005\u1000\u1039\u1000\u1014\u1037\u103a\u1021\u1010\u103d\u1000\u103a 42,000 amperes \u1000\u102d\u102f \u1001\u1036\u1014\u102d\u102f\u1004\u103a\u101b\u100a\u103a\u101b\u103e\u102d\u1014\u102d\u102f\u1004\u103a\u101e\u1031\u102c\u103a\u101c\u100a\u103a\u1038 \u101e\u1004\u103a\u104f ATS \u1010\u103d\u1004\u103a \u100a\u102e\u1019\u103b\u103e\u101e\u1031\u102c short-time \u1001\u1036\u1014\u102d\u102f\u1004\u103a\u101b\u100a\u103a\u1005\u103d\u1019\u103a\u1038\u101b\u100a\u103a \u1019\u101b\u103e\u102d\u1015\u102b\u1000 \u104e\u1004\u103a\u1038\u101e\u100a\u103a \u1005\u1014\u1005\u103a\u104f \u101a\u102f\u1036\u1000\u103c\u100a\u103a\u1005\u102d\u1010\u103a\u1001\u103b\u101b\u1019\u103e\u102f\u1000\u102d\u102f \u1019\u103c\u103e\u1004\u1037\u103a\u1010\u1004\u103a\u101b\u1014\u103a \u1012\u102e\u1007\u102d\u102f\u1004\u103a\u1038\u1011\u102f\u1010\u103a\u1011\u102c\u1038\u101e\u1031\u102c \u100a\u103e\u102d\u1014\u103e\u102d\u102f\u1004\u103a\u1038\u101b\u1031\u1038\u1021\u1005\u102e\u1021\u1005\u1009\u103a\u1019\u103b\u102c\u1038\u1021\u1031\u102c\u1000\u103a\u1010\u103d\u1004\u103a \u1015\u103b\u1000\u103a\u1000\u103d\u1000\u103a\u101e\u100a\u1037\u103a \u1021\u102c\u1038\u1014\u100a\u103a\u1038\u1001\u103b\u1000\u103a\u1016\u103c\u1005\u103a\u101c\u102c\u101e\u100a\u103a\u104b.<\/p>\n\n\n\n\n\n\n\n
Breaker \u1021\u1019\u103b\u102d\u102f\u1038\u1021\u1005\u102c\u1038<\/th>\n\u1015\u102f\u1036\u1019\u103e\u1014\u103a Icw \u1021\u1015\u102d\u102f\u1004\u103a\u1038\u1021\u1001\u103c\u102c\u1038<\/th>\n\u1021\u101e\u102f\u1036\u1038\u1019\u103b\u102c\u1038\u101e\u1031\u102c \u1021\u1001\u103b\u102d\u1014\u103a \u1021\u1006\u1004\u1037\u103a\u101e\u1010\u103a\u1019\u103e\u1010\u103a\u1001\u103b\u1000\u103a\u1019\u103b\u102c\u1038<\/th>\n\u1042\u1047\u1040: Application \u1025\u1015\u1019\u102c<\/th>\n<\/tr>\n<\/thead>\n
Heavy-duty MCCB<\/strong><\/td>\n12-50 kA<\/td>\n0.05s, 0.1s, 0.25s<\/td>\nDistribution switchboard main<\/td>\n<\/tr>\n
Air Circuit Breaker (ACB)<\/strong><\/td>\n30-100 kA<\/td>\n0.1s, 0.25s, 0.5s, 1.0s<\/td>\nService entrance, bus coupling<\/td>\n<\/tr>\n
Compact ACB<\/strong><\/td>\n50-85 kA<\/td>\n0.25s, 0.5s, 1.0s<\/td>\nGenerator main, UPS input<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n

Pro Tip<\/strong>: breaker \u104f datasheet \u101b\u103e\u102d Icw \u1010\u1014\u103a\u1016\u102d\u102f\u1038\u101e\u100a\u103a \u1015\u102f\u1036\u1019\u103e\u1014\u103a\u1021\u102c\u1038\u1016\u103c\u1004\u1037\u103a \u1021\u1019\u103c\u1004\u1037\u103a\u1006\u102f\u1036\u1038 \u1014\u103e\u1031\u102c\u1004\u1037\u103a\u1014\u103e\u1031\u1038\u1001\u103b\u102d\u1014\u103a (\u1019\u103b\u102c\u1038\u101e\u1031\u102c\u1021\u102c\u1038\u1016\u103c\u1004\u1037\u103a 1.0s) \u1000\u102d\u102f \u101a\u1030\u1006\u101e\u100a\u103a\u104b \u101e\u1004\u103a\u104f \u100a\u103e\u102d\u1014\u103e\u102d\u102f\u1004\u103a\u1038\u101b\u1031\u1038 \u101c\u1031\u1037\u101c\u102c\u1019\u103e\u102f\u101e\u100a\u103a \u1010\u102d\u102f\u1010\u1031\u102c\u1004\u103a\u1038\u101e\u1031\u102c \u1014\u103e\u1031\u102c\u1004\u1037\u103a\u1014\u103e\u1031\u1038\u1019\u103e\u102f\u1019\u103b\u102c\u1038 (\u1025\u1015\u1019\u102c 0.1s) \u101c\u102d\u102f\u1021\u1015\u103a\u1015\u102b\u1000\u104a 0.1s \u101b\u103e\u102d thermal stress I2<\/sup>t \u101e\u100a\u103a 1.0s \u1011\u1000\u103a \u101e\u102d\u101e\u102d\u101e\u102c\u101e\u102c \u1014\u100a\u103a\u1038\u101e\u1031\u102c\u1000\u103c\u1031\u102c\u1004\u1037\u103a Icw \u1021\u1006\u1004\u1037\u103a\u101e\u1010\u103a\u1019\u103e\u1010\u103a\u1001\u103b\u1000\u103a \u1014\u100a\u103a\u1038\u101e\u1031\u102c breaker \u1000\u102d\u102f \u101e\u1004\u103a\u1021\u101e\u102f\u1036\u1038\u1015\u103c\u102f\u1014\u102d\u102f\u1004\u103a\u1015\u102b\u101e\u100a\u103a\u104b I2<\/sup>t(fault) < I2<\/sup>cw \u00d7 t(delay) \u1016\u103c\u1005\u103a\u1000\u103c\u1031\u102c\u1004\u103a\u1038 \u1021\u1019\u103c\u1032\u1005\u1005\u103a\u1006\u1031\u1038\u1015\u102b\u104b.<\/p>\n

1.3 \u1006\u1000\u103a\u1005\u1015\u103a\u1021\u1006\u1004\u1037\u103a\u101e\u1010\u103a\u1019\u103e\u1010\u103a\u1001\u103b\u1000\u103a\u1019\u103b\u102c\u1038- Icu, Ics, \u1014\u103e\u1004\u1037\u103a Icm<\/h3>\n

\u1006\u102c\u1038\u1000\u1005\u103a\u1018\u101b\u102d\u1010\u103a\u1000\u102c\u104f \u101d\u102b\u101a\u102c\u101b\u103e\u1031\u102c\u1037\u1016\u103c\u1005\u103a\u1019\u103e\u102f\u1005\u103d\u1019\u103a\u1038\u1006\u1031\u102c\u1004\u103a\u101b\u100a\u103a\u1010\u103d\u1004\u103a \u1021\u1015\u103c\u1014\u103a\u1021\u101c\u103e\u1014\u103a\u1006\u1000\u103a\u1005\u1015\u103a\u1014\u1031\u101e\u1031\u102c \u1021\u1006\u1004\u1037\u103a\u101e\u1010\u103a\u1019\u103e\u1010\u103a\u1001\u103b\u1000\u103a\u101c\u1031\u1038\u1001\u102f\u1015\u102b\u101d\u1004\u103a\u1015\u103c\u102e\u1038 \u101e\u102e\u1038\u1001\u103c\u102c\u1038\u101e\u1010\u103a\u1019\u103e\u1010\u103a\u1001\u103b\u1000\u103a\u1019\u103b\u102c\u1038\u1019\u101f\u102f\u1010\u103a\u1018\u1032 \u100a\u103e\u102d\u1014\u103e\u102d\u102f\u1004\u103a\u1038\u1011\u102c\u1038\u101e\u1031\u102c\u1005\u1014\u1005\u103a\u1010\u1005\u103a\u1001\u102f\u1021\u1016\u103c\u1005\u103a \u1014\u102c\u1038\u101c\u100a\u103a\u101b\u1019\u100a\u103a\u104b.<\/p>\n

Icu (Ultimate short-circuit breaking capacity)<\/strong> IEC 60947-2 \u1010\u103d\u1004\u103a \u101e\u1010\u103a\u1019\u103e\u1010\u103a\u1011\u102c\u1038\u101e\u1031\u102c \u1005\u1019\u103a\u1038\u101e\u1015\u103a\u1019\u103e\u102f\u1021\u1001\u103c\u1031\u1021\u1014\u1031\u1019\u103b\u102c\u1038\u1021\u1031\u102c\u1000\u103a\u1010\u103d\u1004\u103a \u1018\u101b\u102d\u1010\u103a\u1000\u102c\u101e\u100a\u103a \u101c\u102f\u1036\u1001\u103c\u102f\u1036\u1005\u103d\u102c\u1016\u103c\u1010\u103a\u1010\u1031\u102c\u1000\u103a\u1014\u102d\u102f\u1004\u103a\u101e\u1031\u102c \u1021\u1019\u103c\u1004\u1037\u103a\u1006\u102f\u1036\u1038 RMS symmetrical fault current \u1000\u102d\u102f \u101e\u1010\u103a\u1019\u103e\u1010\u103a\u101e\u100a\u103a\u104b Icu \u1010\u103d\u1004\u103a \u1016\u103c\u1010\u103a\u1010\u1031\u102c\u1000\u103a\u1015\u103c\u102e\u1038\u1014\u1031\u102c\u1000\u103a \u1018\u101b\u102d\u1010\u103a\u1000\u102c\u101e\u100a\u103a \u1015\u103b\u1000\u103a\u1005\u102e\u1038\u1014\u102d\u102f\u1004\u103a\u1015\u103c\u102e\u1038 \u1006\u1000\u103a\u101c\u1000\u103a\u1021\u101e\u102f\u1036\u1038\u1015\u103c\u102f\u101b\u1014\u103a \u1019\u101e\u1004\u1037\u103a\u101c\u103b\u1031\u102c\u103a\u101e\u1031\u102c\u103a\u101c\u100a\u103a\u1038 \u1018\u1031\u1038\u1021\u1014\u1039\u1010\u101b\u102c\u101a\u103a\u1016\u103c\u1005\u103a\u1005\u1031\u1001\u103c\u1004\u103a\u1038\u1019\u101b\u103e\u102d\u101b\u1015\u102b\u104b Icu \u1000\u102d\u102f \u101b\u103e\u1004\u103a\u101e\u1014\u103a\u1014\u102d\u102f\u1004\u103a\u1005\u103d\u1019\u103a\u1038\u1021\u1016\u103c\u1005\u103a \u1019\u103e\u1010\u103a\u101a\u1030\u1015\u102b\u2014\u1018\u101b\u102d\u1010\u103a\u1000\u102c\u101e\u100a\u103a \u104e\u1004\u103a\u1038\u1000\u102d\u102f \u1000\u103b\u1031\u102c\u103a\u1016\u103c\u1010\u103a\u1014\u102d\u102f\u1004\u103a\u1001\u1032\u1037\u101e\u1031\u102c\u103a\u101c\u100a\u103a\u1038 \u1021\u1014\u100a\u103a\u1038\u1004\u101a\u103a\u101e\u102c\u1016\u103c\u1005\u103a\u101e\u100a\u103a\u104b \u1021\u101b\u1031\u1038\u1000\u103c\u102e\u1038\u101e\u1031\u102c \u1010\u1015\u103a\u1006\u1004\u103a\u1019\u103e\u102f\u1019\u103b\u102c\u1038\u1021\u1010\u103d\u1000\u103a \u101b\u101b\u103e\u102d\u1014\u102d\u102f\u1004\u103a\u101e\u1031\u102c fault current \u101e\u100a\u103a \u101c\u100a\u103a\u1015\u1010\u103a\u1019\u103e\u102f\u1021\u1001\u103c\u1031\u1021\u1014\u1031\u1021\u102c\u1038\u101c\u102f\u1036\u1038\u1021\u1031\u102c\u1000\u103a\u1010\u103d\u1004\u103a Icu \u1021\u1031\u102c\u1000\u103a\u1010\u103d\u1004\u103a \u1000\u1031\u102c\u1004\u103a\u1038\u1005\u103d\u102c\u101b\u103e\u102d\u1014\u1031\u1005\u1031\u101c\u102d\u102f\u1015\u102b\u101e\u100a\u103a\u104b.<\/p>\n

Ics (Service short-circuit breaking capacity)<\/strong> \u1018\u101b\u102d\u1010\u103a\u1000\u102c\u101e\u100a\u103a \u1016\u103c\u1010\u103a\u1010\u1031\u102c\u1000\u103a\u1014\u102d\u102f\u1004\u103a\u1015\u103c\u102e\u1038\u1014\u1031\u102c\u1000\u103a \u1005\u103d\u1019\u103a\u1038\u1006\u1031\u102c\u1004\u103a\u101b\u100a\u103a\u1021\u1015\u103c\u100a\u1037\u103a\u1021\u101d\u1016\u103c\u1004\u1037\u103a \u1015\u102f\u1036\u1019\u103e\u1014\u103a\u101c\u100a\u103a\u1015\u1010\u103a\u1019\u103e\u102f\u1000\u102d\u102f \u1006\u1000\u103a\u101c\u1000\u103a\u101c\u102f\u1015\u103a\u1006\u1031\u102c\u1004\u103a\u1014\u102d\u102f\u1004\u103a\u101e\u100a\u1037\u103a fault current \u1021\u1006\u1004\u1037\u103a\u1000\u102d\u102f \u1000\u102d\u102f\u101a\u103a\u1005\u102c\u1038\u1015\u103c\u102f\u101e\u100a\u103a\u104b IEC \u1005\u1036\u1014\u103e\u102f\u1014\u103a\u1038\u101e\u100a\u103a Ics \u1000\u102d\u102f Icu \u104f \u101b\u102c\u1001\u102d\u102f\u1004\u103a\u1014\u103e\u102f\u1014\u103a\u1038\u1021\u1016\u103c\u1005\u103a \u101e\u1010\u103a\u1019\u103e\u1010\u103a\u101e\u100a\u103a\u2014\u1015\u102f\u1036\u1019\u103e\u1014\u103a\u1021\u102c\u1038\u1016\u103c\u1004\u1037\u103a 25%, 50%, 75% \u101e\u102d\u102f\u1037\u1019\u101f\u102f\u1010\u103a 100% \u101e\u100a\u103a \u1018\u101b\u102d\u1010\u103a\u1000\u102c\u1012\u102e\u1007\u102d\u102f\u1004\u103a\u1038\u1014\u103e\u1004\u1037\u103a \u101b\u100a\u103a\u101b\u103d\u101a\u103a\u1011\u102c\u1038\u101e\u1031\u102c\u1021\u101e\u102f\u1036\u1038\u1015\u103c\u102f\u1019\u103e\u102f\u1015\u1031\u102b\u103a\u1019\u1030\u1010\u100a\u103a\u101e\u100a\u103a\u104b \u1021\u101b\u1031\u1038\u1000\u103c\u102e\u1038\u101e\u1031\u102c \u101c\u103d\u103e\u1032\u1015\u103c\u1031\u102c\u1004\u103a\u1038\u1001\u101c\u102f\u1010\u103a\u1005\u1014\u1005\u103a\u1019\u103b\u102c\u1038<\/a> \u1006\u1031\u1038\u101b\u102f\u1036\u1019\u103b\u102c\u1038\u104a \u1012\u1031\u1010\u102c\u1005\u1004\u103a\u1010\u102c\u1019\u103b\u102c\u1038 \u101e\u102d\u102f\u1037\u1019\u101f\u102f\u1010\u103a \u1021\u101b\u1031\u1038\u1015\u1031\u102b\u103a\u1015\u102b\u101d\u102b\u1010\u1015\u103a\u1006\u1004\u103a\u1019\u103e\u102f\u1019\u103b\u102c\u1038\u1010\u103d\u1004\u103a Ics = Icu \u104f 100% \u101b\u103e\u102d\u101e\u1031\u102c \u1018\u101b\u102d\u1010\u103a\u1000\u102c\u1019\u103b\u102c\u1038\u1000\u102d\u102f \u101e\u1010\u103a\u1019\u103e\u1010\u103a\u1001\u103c\u1004\u103a\u1038\u101e\u100a\u103a \u1021\u1019\u103c\u1004\u1037\u103a\u1006\u102f\u1036\u1038\u1021\u1006\u1004\u1037\u103a\u101e\u1010\u103a\u1019\u103e\u1010\u103a\u1011\u102c\u1038\u101e\u1031\u102c fault \u1016\u103c\u1005\u103a\u101b\u1015\u103a\u1019\u103b\u102c\u1038\u101e\u100a\u103a \u1000\u102c\u1000\u103d\u101a\u103a\u1019\u103e\u102f\u1005\u1014\u1005\u103a\u104f \u1001\u102d\u102f\u1004\u103a\u1019\u102c\u1019\u103e\u102f\u1000\u102d\u102f \u1019\u1011\u102d\u1001\u102d\u102f\u1000\u103a\u1005\u1031\u1000\u103c\u1031\u102c\u1004\u103a\u1038 \u101e\u1031\u1001\u103b\u102c\u1005\u1031\u101e\u100a\u103a\u104b.<\/p>\n

Icm (Rated making current)<\/strong> \u1021\u1006\u1004\u1037\u103a\u101e\u1010\u103a\u1019\u103e\u1010\u103a\u1011\u102c\u1038\u101e\u1031\u102c \u1017\u102d\u102f\u1037\u1021\u102c\u1038\u1010\u103d\u1004\u103a \u1018\u101b\u102d\u1010\u103a\u1000\u102c\u101e\u100a\u103a \u101c\u102f\u1036\u1001\u103c\u102f\u1036\u1005\u103d\u102c\u1015\u102d\u1010\u103a\u1014\u102d\u102f\u1004\u103a\u101e\u1031\u102c \u1021\u1019\u103c\u1004\u1037\u103a\u1006\u102f\u1036\u1038 peak instantaneous current \u1000\u102d\u102f \u101e\u1010\u103a\u1019\u103e\u1010\u103a\u101e\u100a\u103a\u104b \u1024\u1021\u1006\u1004\u1037\u103a\u101e\u1010\u103a\u1019\u103e\u1010\u103a\u1001\u103b\u1000\u103a\u101e\u100a\u103a ATS \u101c\u103d\u103e\u1032\u1015\u103c\u1031\u102c\u1004\u103a\u1038\u1001\u103c\u1004\u103a\u1038\u101c\u102f\u1015\u103a\u1004\u1014\u103a\u1038\u1019\u103b\u102c\u1038\u1014\u103e\u1004\u1037\u103a \u1002\u103b\u1004\u103a\u1014\u101b\u1031\u1010\u102c\u1001\u103b\u102d\u1014\u103a\u1000\u102d\u102f\u1000\u103a\u1001\u103c\u1004\u103a\u1038\u1021\u1005\u102e\u1021\u1005\u1009\u103a\u1019\u103b\u102c\u1038\u1021\u1010\u103d\u1004\u103a\u1038 \u1021\u101b\u1031\u1038\u1000\u103c\u102e\u1038\u101c\u102c\u1015\u103c\u102e\u1038 \u101e\u1004\u103a\u101e\u100a\u103a \u101c\u1000\u103a\u101b\u103e\u102d fault \u1021\u1001\u103c\u1031\u1021\u1014\u1031\u101e\u102d\u102f\u1037 \u1015\u103c\u1031\u102c\u1004\u103a\u1038\u101c\u1032\u1014\u1031\u1014\u102d\u102f\u1004\u103a\u101e\u100a\u103a\u104b Icm \u1014\u103e\u1004\u1037\u103a Icu \u1021\u1000\u103c\u102c\u1038 \u1006\u1000\u103a\u1005\u1015\u103a\u1019\u103e\u102f\u101e\u100a\u103a fault loop \u104f power factor \u1015\u1031\u102b\u103a\u1010\u103d\u1004\u103a\u1019\u1030\u1010\u100a\u103a\u101e\u100a\u103a- Icm = k \u00d7 Icu \u1016\u103c\u1005\u103a\u1015\u103c\u102e\u1038 k \u101e\u100a\u103a 1.5 (high impedance, resistive faults) \u1019\u103e 2.2 (low impedance, inductive faults \u101e\u100a\u103a power system \u1019\u103b\u102c\u1038\u1010\u103d\u1004\u103a \u1015\u102f\u1036\u1019\u103e\u1014\u103a\u1016\u103c\u1005\u103a\u101e\u100a\u103a) \u1021\u1011\u102d\u101b\u103e\u102d\u101e\u100a\u103a\u104b cos \u03c6 = 0.3 \u1010\u103d\u1004\u103a Icu = 50kA \u1021\u1006\u1004\u1037\u103a\u101e\u1010\u103a\u1019\u103e\u1010\u103a\u1011\u102c\u1038\u101e\u1031\u102c \u1018\u101b\u102d\u1010\u103a\u1000\u102c\u1021\u1010\u103d\u1000\u103a Icm \u2248 110kA peak \u1000\u102d\u102f \u1019\u103b\u103e\u1031\u102c\u103a\u101c\u1004\u1037\u103a\u1015\u102b\u104b.<\/p>\n

\u1021\u1016\u103c\u1005\u103a\u1019\u103b\u102c\u1038\u101e\u1031\u102c \u1021\u1019\u103e\u102c\u1038<\/strong>: \u1021\u1004\u103a\u1002\u103b\u1004\u103a\u1014\u102e\u101a\u102c\u1019\u103b\u102c\u1038\u101e\u100a\u103a upstream \u1018\u101b\u102d\u1010\u103a\u1000\u102c\u104f Icu \u101e\u100a\u103a \u101b\u101b\u103e\u102d\u1014\u102d\u102f\u1004\u103a\u101e\u1031\u102c fault current \u1011\u1000\u103a\u1000\u103b\u1031\u102c\u103a\u101c\u103d\u1014\u103a\u1000\u103c\u1031\u102c\u1004\u103a\u1038 \u1019\u1000\u103c\u102c\u1001\u100f\u1021\u1010\u100a\u103a\u1015\u103c\u102f\u101e\u1031\u102c\u103a\u101c\u100a\u103a\u1038 time delay \u1019\u103b\u102c\u1038\u1000\u102d\u102f \u1021\u101e\u102f\u1036\u1038\u1015\u103c\u102f\u101e\u1031\u102c\u1021\u1001\u102b Icw \u101c\u102f\u1036\u101c\u1031\u102c\u1000\u103a\u1019\u103e\u102f\u1000\u102d\u102f \u1005\u1005\u103a\u1006\u1031\u1038\u101b\u1014\u103a \u1015\u103b\u1000\u103a\u1000\u103d\u1000\u103a\u1000\u103c\u101e\u100a\u103a\u104b \u1002\u103b\u1004\u103a\u1014\u101b\u1031\u1010\u102c-ATS-utility \u100a\u103e\u102d\u1014\u103e\u102d\u102f\u1004\u103a\u1038\u1019\u103e\u102f\u1021\u1005\u102e\u1021\u1005\u1009\u103a\u1019\u103b\u102c\u1038<\/a>, \u1024\u1015\u1031\u102b\u1037\u1006\u1019\u103e\u102f\u101e\u100a\u103a \u1000\u1015\u103a\u1006\u102d\u102f\u1038\u1000\u103c\u102e\u1038\u1016\u103c\u1005\u103a\u1014\u102d\u102f\u1004\u103a\u101e\u100a\u103a\u2014\u1018\u101b\u102d\u1010\u103a\u1000\u102c\u101e\u100a\u103a fault \u1000\u102d\u102f \u101b\u103e\u1004\u103a\u101e\u1014\u103a\u1014\u102d\u102f\u1004\u103a\u101e\u100a\u103a (Icu \u1014\u103e\u1004\u1037\u103a\u1000\u102d\u102f\u1000\u103a\u100a\u102e\u101e\u100a\u103a) \u101e\u102d\u102f\u1037\u101e\u1031\u102c\u103a 0.3-\u1005\u1000\u1039\u1000\u1014\u1037\u103a delay window \u1021\u1010\u103d\u1004\u103a\u1038 ATS \u101e\u100a\u103a contacts \u1019\u103b\u102c\u1038\u1000\u1015\u103a\u101e\u103d\u102c\u1038\u101e\u100a\u103a\u104a \u1021\u1018\u101a\u103a\u1000\u103c\u1031\u102c\u1004\u1037\u103a\u1006\u102d\u102f\u101e\u1031\u102c\u103a \u1019\u100a\u103a\u101e\u1030\u1019\u103b\u103e short-time ratings \u1019\u103b\u102c\u1038\u1000\u102d\u102f \u1021\u1010\u100a\u103a\u1019\u1015\u103c\u102f\u101e\u1031\u102c\u1000\u103c\u1031\u102c\u1004\u1037\u103a\u1016\u103c\u1005\u103a\u101e\u100a\u103a\u104b.<\/p>\n

\u1021\u1015\u102d\u102f\u1004\u103a\u1038 \u1042- \u101b\u103d\u1031\u1038\u1001\u103b\u101a\u103a\u1014\u102d\u102f\u1004\u103a\u1019\u103e\u102f\u1019\u1030\u1019\u103b\u102c\u1038\u1014\u103e\u1004\u1037\u103a \u100a\u103e\u102d\u1014\u103e\u102d\u102f\u1004\u103a\u1038\u1019\u103e\u102f\u1014\u100a\u103a\u1038\u1017\u103b\u1030\u101f\u102c\u1019\u103b\u102c\u1038<\/h2>\n

2.1 \u101b\u103d\u1031\u1038\u1001\u103b\u101a\u103a\u1014\u102d\u102f\u1004\u103a\u1019\u103e\u102f (\u1001\u103d\u1032\u1001\u103c\u102c\u1038\u1001\u103c\u1004\u103a\u1038) \u1006\u102d\u102f\u101e\u100a\u103a\u1019\u103e\u102c \u1021\u1018\u101a\u103a\u1014\u100a\u103a\u1038\u104b<\/h3>\n

\u101b\u103d\u1031\u1038\u1001\u103b\u101a\u103a\u1019\u103e\u102f<\/strong>, \u1001\u103d\u1032\u1001\u103c\u102c\u1038\u1001\u103c\u1004\u103a\u1038 \u101e\u102d\u102f\u1037\u1019\u101f\u102f\u1010\u103a \u100a\u103e\u102d\u1014\u103e\u102d\u102f\u1004\u103a\u1038\u1001\u103c\u1004\u103a\u1038\u101f\u102f\u101c\u100a\u103a\u1038\u1001\u1031\u102b\u103a\u101e\u100a\u103a\u104a \u1016\u103c\u1014\u1037\u103a\u1016\u103c\u1030\u1038\u101b\u1031\u1038\u1005\u1014\u1005\u103a\u1010\u103d\u1004\u103a overcurrent \u1000\u102c\u1000\u103d\u101a\u103a\u101b\u1031\u1038\u1000\u102d\u101b\u102d\u101a\u102c\u1019\u103b\u102c\u1038\u104f \u1019\u101f\u102c\u1017\u103b\u1030\u101f\u102c\u1019\u103c\u1031\u102c\u1000\u103a\u1021\u1005\u102e\u1021\u1005\u1009\u103a\u1000\u102d\u102f \u1016\u1031\u102c\u103a\u1015\u103c\u1015\u103c\u102e\u1038 fault \u104f \u1001\u103b\u1000\u103a\u1001\u103b\u1004\u103a\u1038 upstream \u101b\u103e\u102d \u1000\u102c\u1000\u103d\u101a\u103a\u101b\u1031\u1038\u1000\u102d\u101b\u102d\u101a\u102c\u1010\u1005\u103a\u1001\u102f\u101e\u102c \u101c\u100a\u103a\u1015\u1010\u103a\u1000\u102c \u1021\u1001\u103c\u102c\u1038 upstream \u1000\u102d\u101b\u102d\u101a\u102c\u1019\u103b\u102c\u1038\u1021\u102c\u1038\u101c\u102f\u1036\u1038 \u1015\u102d\u1010\u103a\u1011\u102c\u1038\u101e\u100a\u103a\u104b \u1021\u1004\u103a\u1002\u103b\u1004\u103a\u1014\u102e\u101a\u102c\u104f \u101b\u100a\u103a\u1019\u103e\u1014\u103a\u1038\u1001\u103b\u1000\u103a\u1019\u103e\u102c \u1015\u102b\u101d\u102b\u1015\u103c\u1010\u103a\u1010\u1031\u102c\u1000\u103a\u1019\u103e\u102f\u104f \u1021\u1010\u102d\u102f\u1004\u103a\u1038\u1021\u1010\u102c\u1000\u102d\u102f \u101c\u103b\u103e\u1031\u102c\u1037\u1001\u103b\u101b\u1014\u103a\u1016\u103c\u1005\u103a\u101e\u100a\u103a\u2014\u1010\u1015\u103a\u1006\u1004\u103a\u1019\u103e\u102f\u104f \u1016\u103c\u1005\u103a\u1014\u102d\u102f\u1004\u103a\u101e\u1019\u103b\u103e \u1021\u101e\u1031\u1038\u1004\u101a\u103a\u1006\u102f\u1036\u1038\u1021\u1015\u102d\u102f\u1004\u103a\u1038\u1000\u102d\u102f \u101e\u102e\u1038\u1001\u103c\u102c\u1038\u1001\u103d\u1032\u1011\u102f\u1010\u103a\u1015\u103c\u102e\u1038 \u1021\u1001\u103c\u102c\u1038\u101d\u1014\u103a\u1019\u103b\u102c\u1038\u1021\u102c\u1038\u101c\u102f\u1036\u1038\u1000\u102d\u102f \u101d\u1014\u103a\u1006\u1031\u102c\u1004\u103a\u1019\u103e\u102f\u1006\u1000\u103a\u101c\u1000\u103a\u1015\u1031\u1038\u1021\u1015\u103a\u101e\u100a\u103a\u104b.<\/p>\n

\u1018\u102f\u1036 main breaker \u1019\u103e \u1015\u1036\u1037\u1015\u102d\u102f\u1038\u1015\u1031\u1038\u101e\u1031\u102c \u1010\u1005\u103a\u1026\u1038\u1001\u103b\u1004\u103a\u1038 feeder breakers \u1019\u103e\u1010\u1006\u1004\u1037\u103a \u1011\u102f\u1010\u103a\u101c\u102f\u1015\u103a\u101e\u100a\u1037\u103a\u1006\u1032\u101c\u103a\u1014\u103e\u1005\u103a\u1006\u101a\u103a\u1000\u102d\u102f \u1015\u1036\u1037\u1015\u102d\u102f\u1038\u1015\u1031\u1038\u101e\u1031\u102c \u1016\u103c\u1014\u1037\u103a\u1016\u103c\u1030\u1038\u101b\u1031\u1038\u1005\u1014\u1005\u103a\u1000\u102d\u102f \u1005\u1009\u103a\u1038\u1005\u102c\u1038\u1015\u102b\u104b \u101b\u103d\u1031\u1038\u1001\u103b\u101a\u103a\u1014\u102d\u102f\u1004\u103a\u1005\u103d\u1019\u103a\u1038\u1019\u101b\u103e\u102d\u1018\u1032 Cell 1 \u1010\u103d\u1004\u103a \u1019\u103c\u1031\u1015\u103c\u1004\u103a fault \u1010\u1005\u103a\u1001\u102f\u101e\u100a\u103a main breaker \u1000\u102d\u102f \u1001\u101c\u102f\u1010\u103a\u1010\u102d\u102f\u1000\u103a\u1014\u102d\u102f\u1004\u103a\u1015\u103c\u102e\u1038 \u1006\u1032\u101c\u103a\u1014\u103e\u1005\u103a\u1006\u101a\u103a\u101c\u102f\u1036\u1038\u1000\u102d\u102f \u1019\u103e\u1031\u102c\u1004\u103a\u101e\u103d\u102c\u1038\u1005\u1031\u1000\u102c \u1005\u1000\u103a\u101b\u102f\u1036\u1010\u1005\u103a\u1001\u102f\u101c\u102f\u1036\u1038\u1010\u103d\u1004\u103a \u1011\u102f\u1010\u103a\u101c\u102f\u1015\u103a\u1019\u103e\u102f\u1000\u102d\u102f \u101b\u1015\u103a\u1010\u1014\u1037\u103a\u1005\u1031\u1014\u102d\u102f\u1004\u103a\u101e\u100a\u103a\u104b \u101e\u1004\u1037\u103a\u101c\u103b\u1031\u102c\u103a\u101e\u1031\u102c \u101b\u103d\u1031\u1038\u1001\u103b\u101a\u103a\u1014\u102d\u102f\u1004\u103a\u1005\u103d\u1019\u103a\u1038\u1016\u103c\u1004\u1037\u103a Cell 1 feeder breaker \u101e\u102c \u1016\u103d\u1004\u1037\u103a\u1015\u103c\u102e\u1038 \u1021\u1001\u103c\u102c\u1038\u1006\u1032\u101c\u103a\u1010\u1005\u103a\u1006\u101a\u1037\u103a\u1000\u102d\u102f\u1038\u1001\u102f \u101c\u100a\u103a\u1015\u1010\u103a\u1014\u1031\u1005\u1009\u103a \u1010\u1005\u103a\u1001\u102f\u1010\u100a\u103a\u1038\u101e\u1031\u102c\u1006\u1032\u101c\u103a\u101e\u102d\u102f\u1037 \u1015\u103c\u1010\u103a\u1010\u1031\u102c\u1000\u103a\u1019\u103e\u102f\u1000\u102d\u102f \u1011\u102d\u1014\u103a\u1038\u1011\u102c\u1038\u101e\u100a\u103a\u104b.<\/p>\n

\u101b\u103d\u1031\u1038\u1001\u103b\u101a\u103a\u1014\u102d\u102f\u1004\u103a\u1005\u103d\u1019\u103a\u1038\u1000\u102d\u102f \u1016\u103d\u1004\u1037\u103a\u1015\u1031\u1038\u101e\u100a\u1037\u103a \u1021\u1001\u103c\u1031\u1001\u1036\u101a\u1014\u1039\u1010\u101b\u102c\u1038\u1014\u103e\u1005\u103a\u1001\u102f\u101b\u103e\u102d\u101e\u100a\u103a- current \u101b\u103d\u1031\u1038\u1001\u103b\u101a\u103a\u1014\u102d\u102f\u1004\u103a\u1005\u103d\u1019\u103a\u1038<\/strong> (ampere \u101b\u103d\u1031\u1038\u1001\u103b\u101a\u103a\u1014\u102d\u102f\u1004\u103a\u1005\u103d\u1019\u103a\u1038 \u101e\u102d\u102f\u1037\u1019\u101f\u102f\u1010\u103a magnitude \u1021\u102c\u1038\u1016\u103c\u1004\u1037\u103a \u1001\u103d\u1032\u1001\u103c\u102c\u1038\u1001\u103c\u1004\u103a\u1038\u101f\u102f\u101c\u100a\u103a\u1038\u1001\u1031\u102b\u103a\u101e\u100a\u103a) \u1014\u103e\u1004\u1037\u103a time \u101b\u103d\u1031\u1038\u1001\u103b\u101a\u103a\u1014\u102d\u102f\u1004\u103a\u1005\u103d\u1019\u103a\u1038<\/strong> (\u101b\u100a\u103a\u101b\u103d\u101a\u103a\u1001\u103b\u1000\u103a\u101b\u103e\u102d\u101b\u103e\u102d \u1014\u103e\u1031\u102c\u1004\u1037\u103a\u1014\u103e\u1031\u1038\u1001\u103c\u1004\u103a\u1038\u1016\u103c\u1004\u1037\u103a \u1001\u103d\u1032\u1001\u103c\u102c\u1038\u1001\u103c\u1004\u103a\u1038)\u104b \u100a\u103e\u102d\u1014\u103e\u102d\u102f\u1004\u103a\u1038\u1011\u102c\u1038\u101e\u1031\u102c \u1000\u102c\u1000\u103d\u101a\u103a\u101b\u1031\u1038\u1021\u1005\u102e\u1021\u1005\u1009\u103a\u1021\u1019\u103b\u102c\u1038\u1005\u102f\u101e\u100a\u103a \u1019\u1010\u1030\u100a\u102e\u101e\u1031\u102c fault current \u1021\u1015\u102d\u102f\u1004\u103a\u1038\u1021\u1001\u103c\u102c\u1038\u1019\u103b\u102c\u1038\u1010\u103d\u1004\u103a \u101a\u1014\u1039\u1010\u101b\u102c\u1038\u1014\u103e\u1005\u103a\u1001\u102f\u101c\u102f\u1036\u1038\u1000\u102d\u102f \u1021\u101e\u102f\u1036\u1038\u1015\u103c\u102f\u1015\u103c\u102e\u1038 \u1019\u103c\u1004\u1037\u103a\u1019\u102c\u1038\u101e\u1031\u102c fault \u1021\u1006\u1004\u1037\u103a\u1019\u103b\u102c\u1038\u1010\u103d\u1004\u103a \u1010\u1005\u103a\u1005\u102d\u1010\u103a\u1010\u1005\u103a\u1015\u102d\u102f\u1004\u103a\u1038\u101b\u103d\u1031\u1038\u1001\u103b\u101a\u103a\u1014\u102d\u102f\u1004\u103a\u1005\u103d\u1019\u103a\u1038\u1014\u103e\u1004\u1037\u103a \u1005\u1014\u1005\u103a impedance \u101e\u100a\u103a \u1019\u1010\u1030\u100a\u102e\u101e\u1031\u102c\u1014\u1031\u101b\u102c\u1019\u103b\u102c\u1038\u1010\u103d\u1004\u103a fault magnitude \u1019\u103b\u102c\u1038\u1000\u102d\u102f \u101e\u1018\u102c\u101d\u1021\u1010\u102d\u102f\u1004\u103a\u1038 \u1001\u103d\u1032\u1001\u103c\u102c\u1038\u1011\u102c\u1038\u101e\u100a\u1037\u103a \u1021\u1014\u102d\u1019\u1037\u103a\u1006\u102f\u1036\u1038 current \u1019\u103b\u102c\u1038\u1010\u103d\u1004\u103a \u1005\u102f\u1005\u102f\u1015\u1031\u102b\u1004\u103a\u1038\u101b\u103d\u1031\u1038\u1001\u103b\u101a\u103a\u1014\u102d\u102f\u1004\u103a\u1005\u103d\u1019\u103a\u1038\u1000\u102d\u102f \u101b\u101b\u103e\u102d\u1005\u1031\u101e\u100a\u103a\u104b.<\/p>\n

2.2 Current \u101b\u103d\u1031\u1038\u1001\u103b\u101a\u103a\u1014\u102d\u102f\u1004\u103a\u1005\u103d\u1019\u103a\u1038- Magnitude \u1021\u102c\u1038\u1016\u103c\u1004\u1037\u103a \u101e\u1018\u102c\u101d\u100a\u103e\u102d\u1014\u103e\u102d\u102f\u1004\u103a\u1038\u1019\u103e\u102f<\/h3>\n

Current \u101b\u103d\u1031\u1038\u1001\u103b\u101a\u103a\u1014\u102d\u102f\u1004\u103a\u1005\u103d\u1019\u103a\u1038\u101e\u100a\u103a \u1016\u103c\u1014\u1037\u103a\u1016\u103c\u1030\u1038\u101b\u1031\u1038\u1021\u1006\u1004\u1037\u103a\u1019\u103b\u102c\u1038\u1021\u1000\u103c\u102c\u1038 fault current magnitude \u1000\u103d\u102c\u1001\u103c\u102c\u1038\u1001\u103b\u1000\u103a\u1019\u103b\u102c\u1038\u1000\u102d\u102f \u1016\u1014\u103a\u1010\u102e\u1038\u101b\u1014\u103a \u1000\u1031\u1018\u101a\u103a\u1019\u103b\u102c\u1038\u1014\u103e\u1004\u1037\u103a \u1011\u101b\u1014\u103a\u1005\u1016\u1031\u102c\u103a\u1019\u102c\u1019\u103b\u102c\u1038\u104f \u101e\u1018\u102c\u101d impedance \u1000\u102d\u102f \u1021\u101e\u102f\u1036\u1038\u1001\u103b\u101e\u100a\u103a\u104b \u1019\u102e\u1010\u102c 50 feeder cable \u104f load \u1021\u1006\u102f\u1036\u1038\u101b\u103e\u102d fault \u101e\u100a\u103a cable impedance \u1000\u103c\u1031\u102c\u1004\u1037\u103a feeder \u104f \u1019\u1030\u101c\u1021\u1005\u101b\u103e\u102d fault \u1011\u1000\u103a current \u1021\u1019\u103b\u102c\u1038\u1000\u103c\u102e\u1038\u1014\u100a\u103a\u1038\u101e\u100a\u103a\u104b downstream \u1018\u101b\u102d\u1010\u103a\u1000\u102c\u1019\u103c\u1004\u103a\u101b\u1019\u100a\u1037\u103a \u1021\u1019\u103c\u1004\u1037\u103a\u1006\u102f\u1036\u1038 fault current \u1021\u1011\u1000\u103a\u1010\u103d\u1004\u103a upstream \u1018\u101b\u102d\u1010\u103a\u1000\u102c\u104f instantaneous trip threshold \u1000\u102d\u102f \u101e\u1010\u103a\u1019\u103e\u1010\u103a\u1001\u103c\u1004\u103a\u1038\u1016\u103c\u1004\u1037\u103a \u101e\u1004\u103a\u101e\u100a\u103a \u101b\u103d\u1031\u1038\u1001\u103b\u101a\u103a\u1014\u102d\u102f\u1004\u103a\u1005\u103d\u1019\u103a\u1038\u1000\u102d\u102f \u1021\u101c\u102d\u102f\u1021\u101c\u103b\u1031\u102c\u1000\u103a\u101b\u101b\u103e\u102d\u101e\u100a\u103a\u2014downstream \u1000\u102d\u101b\u102d\u101a\u102c\u101e\u100a\u103a current \u1014\u100a\u103a\u1038\u1015\u102b\u1038\u101e\u1031\u102c\u1014\u1031\u101b\u102c\u1019\u103b\u102c\u1038\u1010\u103d\u1004\u103a \u1001\u101c\u102f\u1010\u103a\u1010\u102d\u102f\u1000\u103a\u101e\u100a\u103a\u104a upstream \u1000\u102d\u101b\u102d\u101a\u102c\u101e\u100a\u103a \u104e\u1004\u103a\u1038\u104f\u1000\u102c\u1000\u103d\u101a\u103a\u1011\u102c\u1038\u101e\u1031\u102c\u1007\u102f\u1014\u103a\u101b\u103e\u102d fault \u1019\u103b\u102c\u1038\u1000\u102d\u102f\u101e\u102c \u1010\u102f\u1036\u1037\u1015\u103c\u1014\u103a\u101e\u100a\u103a\u104b.<\/p>\n

\u1025\u1015\u1019\u102c<\/strong>: \u1019\u102e\u1010\u102c 75 50mm\u00b2 \u1000\u103c\u1031\u1038\u1014\u102e\u1000\u1031\u1018\u101a\u103a\u1019\u103e\u1010\u1006\u1004\u1037\u103a 100A feeder breaker \u1000\u102d\u102f \u1015\u1036\u1037\u1015\u102d\u102f\u1038\u1015\u1031\u1038\u101e\u1031\u102c 400A main breaker \u1010\u1005\u103a\u1001\u102f\u104b main breaker \u1010\u100a\u103a\u1014\u1031\u101b\u102c\u101b\u103e\u102d \u101d\u102b\u101a\u102c\u101b\u103e\u1031\u102c\u1037 current \u101e\u100a\u103a 35kA \u101e\u102d\u102f\u1037\u101b\u1031\u102c\u1000\u103a\u101b\u103e\u102d\u1014\u102d\u102f\u1004\u103a\u101e\u1031\u102c\u103a\u101c\u100a\u103a\u1038 cable impedance \u101e\u100a\u103a feeder breaker \u104f load terminals \u101b\u103e\u102d \u1021\u1019\u103c\u1004\u1037\u103a\u1006\u102f\u1036\u1038 fault current \u1000\u102d\u102f \u1001\u1014\u1037\u103a\u1019\u103e\u1014\u103a\u1038\u1001\u103c\u1031 12kA \u101e\u102d\u102f\u1037 \u1000\u1014\u1037\u103a\u101e\u1010\u103a\u1011\u102c\u1038\u101e\u100a\u103a\u104b 25kA \u1010\u103d\u1004\u103a main breaker \u104f instantaneous trip \u1014\u103e\u1004\u1037\u103a 15kA \u1010\u103d\u1004\u103a feeder \u104f magnetic trip \u1000\u102d\u102f \u101e\u1010\u103a\u1019\u103e\u1010\u103a\u1001\u103c\u1004\u103a\u1038\u101e\u100a\u103a \u101b\u103d\u1031\u1038\u1001\u103b\u101a\u103a\u1014\u102d\u102f\u1004\u103a\u1005\u103d\u1019\u103a\u1038 window \u1000\u102d\u102f \u1016\u1014\u103a\u1010\u102e\u1038\u101e\u100a\u103a\u201425kA \u1011\u1000\u103a\u1014\u100a\u103a\u1038\u101e\u1031\u102c current \u1000\u102d\u102f\u1006\u103d\u1032\u101a\u1030\u101e\u1031\u102c \u1019\u100a\u103a\u101e\u100a\u1037\u103a fault \u1000\u102d\u102f\u1019\u1006\u102d\u102f feeder breaker \u1010\u1005\u103a\u1001\u102f\u1010\u100a\u103a\u1038\u1000 \u101b\u103e\u1004\u103a\u1038\u101c\u1004\u103a\u1038\u1005\u1031\u101e\u100a\u103a\u104b.<\/p>\n

current \u101b\u103d\u1031\u1038\u1001\u103b\u101a\u103a\u1014\u102d\u102f\u1004\u103a\u1005\u103d\u1019\u103a\u1038\u104f \u1000\u1014\u1037\u103a\u101e\u1010\u103a\u1001\u103b\u1000\u103a\u1019\u103e\u102c \u101b\u103d\u1031\u1038\u1001\u103b\u101a\u103a\u1014\u102d\u102f\u1004\u103a\u1005\u103d\u1019\u103a\u1038\u1000\u1014\u1037\u103a\u101e\u1010\u103a\u1001\u103b\u1000\u103a<\/strong>\u2014upstream \u1014\u103e\u1004\u1037\u103a downstream \u1000\u102d\u101b\u102d\u101a\u102c\u1019\u103b\u102c\u1038\u104f time-current curves \u1006\u102f\u1036\u1019\u103e\u1010\u103a\u101b\u103e\u102d fault current \u1021\u1006\u1004\u1037\u103a\u104b \u1024 current \u1021\u1031\u102c\u1000\u103a\u1010\u103d\u1004\u103a downstream \u1000\u102d\u101b\u102d\u101a\u102c\u1010\u1005\u103a\u1001\u102f\u1010\u100a\u103a\u1038\u101e\u102c \u101c\u100a\u103a\u1015\u1010\u103a\u101e\u100a\u103a\u104b \u104e\u1004\u103a\u1038\u1021\u1011\u1000\u103a\u1010\u103d\u1004\u103a \u1000\u102d\u101b\u102d\u101a\u102c\u1014\u103e\u1005\u103a\u1001\u102f\u101c\u102f\u1036\u1038 \u1010\u1005\u103a\u1015\u103c\u102d\u102f\u1004\u103a\u1014\u1000\u103a \u1001\u101c\u102f\u1010\u103a\u1010\u102d\u102f\u1000\u103a\u1014\u102d\u102f\u1004\u103a\u101e\u100a\u103a (\u101b\u103d\u1031\u1038\u1001\u103b\u101a\u103a\u1014\u102d\u102f\u1004\u103a\u1005\u103d\u1019\u103a\u1038 \u1006\u102f\u1036\u1038\u101b\u103e\u102f\u1036\u1038\u1001\u103c\u1004\u103a\u1038)\u104b \u1015\u102f\u1036\u1019\u103e\u1014\u103a MCCB \u100a\u103e\u102d\u1014\u103e\u102d\u102f\u1004\u103a\u1038\u1019\u103e\u102f\u1021\u1010\u103d\u1032\u1021\u1010\u103d\u1000\u103a \u101b\u103d\u1031\u1038\u1001\u103b\u101a\u103a\u1014\u102d\u102f\u1004\u103a\u1005\u103d\u1019\u103a\u1038\u1000\u1014\u1037\u103a\u101e\u1010\u103a\u1001\u103b\u1000\u103a\u1019\u103b\u102c\u1038\u101e\u100a\u103a \u1018\u101b\u102d\u1010\u103a\u1000\u102c\u1021\u1006\u1004\u1037\u103a\u101e\u1010\u103a\u1019\u103e\u1010\u103a\u1001\u103b\u1000\u103a\u1019\u103b\u102c\u1038\u1014\u103e\u1004\u1037\u103a \u1011\u102f\u1010\u103a\u101c\u102f\u1015\u103a\u101e\u1030\u1019\u103e \u1015\u1036\u1037\u1015\u102d\u102f\u1038\u1015\u1031\u1038\u101e\u1031\u102c \u101b\u103d\u1031\u1038\u1001\u103b\u101a\u103a\u1014\u102d\u102f\u1004\u103a\u1005\u103d\u1019\u103a\u1038\u1007\u101a\u102c\u1038\u1019\u103b\u102c\u1038\u1015\u1031\u102b\u103a\u1019\u1030\u1010\u100a\u103a\u104d 3-15kA \u1021\u1011\u102d\u101b\u103e\u102d\u101e\u100a\u103a\u104b.<\/p>\n

\u1010\u1005\u103a\u1005\u102d\u1010\u103a\u1010\u1005\u103a\u1015\u102d\u102f\u1004\u103a\u1038\u101b\u103d\u1031\u1038\u1001\u103b\u101a\u103a\u1014\u102d\u102f\u1004\u103a\u1005\u103d\u1019\u103a\u1038<\/strong> \u100a\u103e\u102d\u1014\u103e\u102d\u102f\u1004\u103a\u1038\u1019\u103e\u102f\u1000\u102d\u102f \u101b\u103d\u1031\u1038\u1001\u103b\u101a\u103a\u1014\u102d\u102f\u1004\u103a\u1005\u103d\u1019\u103a\u1038\u1000\u1014\u1037\u103a\u101e\u1010\u103a\u1001\u103b\u1000\u103a\u1021\u1011\u102d \u1011\u102d\u1014\u103a\u1038\u101e\u102d\u1019\u103a\u1038\u1011\u102c\u1038\u101e\u1031\u102c\u103a\u101c\u100a\u103a\u1038 \u1019\u103c\u1004\u1037\u103a\u1019\u102c\u1038\u101e\u1031\u102c fault current \u1019\u103b\u102c\u1038\u1010\u103d\u1004\u103a \u1006\u102f\u1036\u1038\u101b\u103e\u102f\u1036\u1038\u101e\u103d\u102c\u1038\u101e\u1031\u102c\u1021\u1001\u102b \u1010\u100a\u103a\u101b\u103e\u102d\u101e\u100a\u103a\u104b. \u1005\u102f\u1005\u102f\u1015\u1031\u102b\u1004\u103a\u1038\u101b\u103d\u1031\u1038\u1001\u103b\u101a\u103a\u1014\u102d\u102f\u1004\u103a\u1005\u103d\u1019\u103a\u1038<\/strong> \u100a\u103e\u102d\u1014\u103e\u102d\u102f\u1004\u103a\u1038\u1019\u103e\u102f\u101e\u100a\u103a downstream \u1000\u102d\u101b\u102d\u101a\u102c\u104f \u1021\u1015\u103c\u100a\u1037\u103a\u1021\u101d\u1016\u103c\u1010\u103a\u1010\u1031\u102c\u1000\u103a\u1014\u102d\u102f\u1004\u103a\u1005\u103d\u1019\u103a\u1038\u1021\u1011\u102d \u1010\u102d\u102f\u1038\u1001\u103b\u1032\u1037\u101e\u100a\u103a\u101f\u102f \u1006\u102d\u102f\u101c\u102d\u102f\u101e\u100a\u103a\u104b \u1010\u1015\u103a\u1006\u1004\u103a\u1019\u103e\u102f\u1019\u103b\u102c\u1038\u1021\u1010\u103d\u1000\u103a \u1021\u101c\u102d\u102f\u1021\u101c\u103b\u1031\u102c\u1000\u103a\u101c\u103d\u103e\u1032\u1015\u103c\u1031\u102c\u1004\u103a\u1038\u1001\u101c\u102f\u1010\u103a fault \u1000\u102c\u1000\u103d\u101a\u103a\u1019\u103e\u102f<\/a> downstream fault \u1019\u103b\u102c\u1038\u1021\u1010\u103d\u1004\u103a\u1038 upstream \u1018\u101b\u102d\u1010\u103a\u1000\u102c\u104f \u1010\u100a\u103a\u1004\u103c\u102d\u1019\u103a\u1019\u103e\u102f\u1000\u102d\u102f \u1021\u102c\u1019\u1001\u1036\u101b\u1019\u100a\u103a\u1016\u103c\u1005\u103a\u1015\u103c\u102e\u1038 \u1005\u102f\u1005\u102f\u1015\u1031\u102b\u1004\u103a\u1038\u101b\u103d\u1031\u1038\u1001\u103b\u101a\u103a\u1014\u102d\u102f\u1004\u103a\u1005\u103d\u1019\u103a\u1038\u1000\u102d\u102f \u101e\u1010\u103a\u1019\u103e\u1010\u103a\u1001\u103b\u1000\u103a \u101e\u102d\u102f\u1037\u1019\u101f\u102f\u1010\u103a \u1000\u102f\u1012\u103a\u101c\u102d\u102f\u1021\u1015\u103a\u1001\u103b\u1000\u103a\u1019\u103b\u102c\u1038\u1016\u103c\u1004\u1037\u103a \u1019\u1000\u103c\u102c\u1001\u100f \u1021\u1015\u103a\u1014\u103e\u1004\u103a\u1038\u1011\u102c\u1038\u101e\u100a\u103a\u104b.<\/p>\n

2.3 Icw \u1015\u102b\u101b\u103e\u102d\u101e\u1031\u102c Time \u101b\u103d\u1031\u1038\u1001\u103b\u101a\u103a\u1014\u102d\u102f\u1004\u103a\u1005\u103d\u1019\u103a\u1038- \u101b\u100a\u103a\u101b\u103d\u101a\u103a\u1001\u103b\u1000\u103a\u101b\u103e\u102d\u101b\u103e\u102d \u1014\u103e\u1031\u102c\u1004\u1037\u103a\u1014\u103e\u1031\u1038\u1019\u103e\u102f\u1019\u103b\u102c\u1038\u1000\u102d\u102f \u1021\u1004\u103a\u1002\u103b\u1004\u103a\u1014\u102e\u101a\u102c\u101c\u102f\u1015\u103a\u1001\u103c\u1004\u103a\u1038<\/h3>\n

Time \u101b\u103d\u1031\u1038\u1001\u103b\u101a\u103a\u1014\u102d\u102f\u1004\u103a\u1005\u103d\u1019\u103a\u1038\u101e\u100a\u103a downstream \u1000\u102d\u101b\u102d\u101a\u102c\u1019\u103b\u102c\u1038\u101e\u100a\u103a fault \u1019\u103b\u102c\u1038\u1000\u102d\u102f \u1026\u1038\u1005\u103d\u102c\u101b\u103e\u1004\u103a\u1038\u101c\u1004\u103a\u1038\u1014\u102d\u102f\u1004\u103a\u101e\u100a\u1037\u103a \u100a\u103e\u102d\u1014\u103e\u102d\u102f\u1004\u103a\u1038\u1019\u103e\u102f window \u1010\u1005\u103a\u1001\u102f\u1000\u102d\u102f \u1016\u1014\u103a\u1010\u102e\u1038\u101b\u1014\u103a upstream \u1000\u102c\u1000\u103d\u101a\u103a\u101b\u1031\u1038\u1000\u102d\u101b\u102d\u101a\u102c\u1019\u103b\u102c\u1038\u1010\u103d\u1004\u103a \u101b\u100a\u103a\u101b\u103d\u101a\u103a\u1001\u103b\u1000\u103a\u101b\u103e\u102d\u101b\u103e\u102d \u1014\u103e\u1031\u102c\u1004\u1037\u103a\u1014\u103e\u1031\u1038\u1019\u103e\u102f\u1019\u103b\u102c\u1038\u1000\u102d\u102f \u1019\u102d\u1010\u103a\u1006\u1000\u103a\u1015\u1031\u1038\u101e\u100a\u103a\u104b \u1024\u1001\u103b\u1009\u103a\u1038\u1000\u1015\u103a\u1019\u103e\u102f\u101e\u100a\u103a current \u101b\u103d\u1031\u1038\u1001\u103b\u101a\u103a\u1014\u102d\u102f\u1004\u103a\u1005\u103d\u1019\u103a\u1038\u1010\u1005\u103a\u1001\u102f\u1010\u100a\u103a\u1038\u101e\u100a\u103a \u1005\u102f\u1005\u102f\u1015\u1031\u102b\u1004\u103a\u1038\u100a\u103e\u102d\u1014\u103e\u102d\u102f\u1004\u103a\u1038\u1019\u103e\u102f\u1000\u102d\u102f \u1019\u101b\u101b\u103e\u102d\u1014\u102d\u102f\u1004\u103a\u101e\u100a\u1037\u103a\u1021\u1001\u102b \u1021\u1011\u1030\u1038\u101e\u1016\u103c\u1004\u1037\u103a \u1015\u102b\u101d\u102b\u1021\u101b\u1004\u103a\u1038\u1021\u1019\u103c\u1005\u103a\u1021\u1014\u102e\u1038\u101b\u103e\u102d \u1019\u103c\u1004\u1037\u103a\u1019\u102c\u1038\u101e\u1031\u102c fault current \u1021\u1006\u1004\u1037\u103a\u1019\u103b\u102c\u1038\u1010\u103d\u1004\u103a \u1019\u101b\u103e\u102d\u1019\u1016\u103c\u1005\u103a\u101c\u102d\u102f\u1021\u1015\u103a\u1015\u103c\u102e\u1038 \u1021\u1006\u1004\u1037\u103a\u1019\u103b\u102c\u1038\u1021\u1000\u103c\u102c\u1038 impedance \u1001\u103d\u1032\u1001\u103c\u102c\u1038\u1019\u103e\u102f\u101e\u100a\u103a \u1021\u1014\u100a\u103a\u1038\u1006\u102f\u1036\u1038\u1016\u103c\u1005\u103a\u101e\u100a\u103a\u104b.<\/p>\n

\"Technical
\u1015\u102f\u1036 \u1044- \u1021\u101b\u1031\u1038\u1000\u103c\u102e\u1038\u101e\u1031\u102c time delay \u1019\u103b\u102c\u1038\u1000\u102d\u102f \u101e\u101b\u102f\u1015\u103a\u1016\u1031\u102c\u103a\u1011\u102c\u1038\u101e\u1031\u102c \u100a\u103e\u102d\u1014\u103e\u102d\u102f\u1004\u103a\u1038\u1019\u103e\u102f\u1015\u102f\u1036\u1000\u103c\u1019\u103a\u1038\u104b utility main (0.4s delay) \u1014\u103e\u1004\u1037\u103a \u1002\u103b\u1004\u103a\u1014\u101b\u1031\u1010\u102c\u1018\u101b\u102d\u1010\u103a\u1000\u102c (0.2s delay) \u101e\u100a\u103a downstream feeders (instantaneous) \u1014\u103e\u1004\u1037\u103a \u100a\u103e\u102d\u1014\u103e\u102d\u102f\u1004\u103a\u1038\u1011\u102c\u1038\u1015\u103c\u102e\u1038 ATS \u101e\u100a\u103a \u1024 delay \u1000\u102c\u101c\u1019\u103b\u102c\u1038\u1021\u1010\u103d\u1004\u103a\u1038 fault current \u1000\u102d\u102f \u1001\u1036\u1014\u102d\u102f\u1004\u103a\u101b\u100a\u103a\u101b\u103e\u102d\u101b\u1014\u103a \u101c\u102d\u102f\u1021\u1015\u103a\u101e\u100a\u103a\u104b.<\/figcaption><\/figure>\n

\u1019\u1030\u101e\u100a\u103a \u101b\u102d\u102f\u1038\u101b\u103e\u1004\u103a\u1038\u101e\u100a\u103a- upstream Category B \u1018\u101b\u102d\u1010\u103a\u1000\u102c\u1000\u102d\u102f short-time delay (\u1015\u102f\u1036\u1019\u103e\u1014\u103a\u1021\u102c\u1038\u1016\u103c\u1004\u1037\u103a 0.1s, 0.2s \u101e\u102d\u102f\u1037\u1019\u101f\u102f\u1010\u103a 0.4s) \u1016\u103c\u1004\u1037\u103a configure \u101c\u102f\u1015\u103a\u1015\u102b\u104a \u1011\u102d\u102f\u1037\u1014\u1031\u102c\u1000\u103a downstream \u1018\u101b\u102d\u1010\u103a\u1000\u102c\u1019\u103b\u102c\u1038\u1000\u102d\u102f \u1010\u1016\u103c\u100a\u103a\u1038\u1016\u103c\u100a\u103a\u1038\u1010\u102d\u102f\u1010\u1031\u102c\u1004\u103a\u1038\u101e\u1031\u102c delay \u1019\u103b\u102c\u1038 \u101e\u102d\u102f\u1037\u1019\u101f\u102f\u1010\u103a instantaneous trip \u1016\u103c\u1004\u1037\u103a \u101e\u1010\u103a\u1019\u103e\u1010\u103a\u1015\u102b\u104b fault \u1016\u103c\u1005\u103a\u1015\u1031\u102b\u103a\u101e\u1031\u102c\u1021\u1001\u102b fault \u1014\u103e\u1004\u1037\u103a \u1021\u1014\u102e\u1038\u1006\u102f\u1036\u1038 downstream \u1018\u101b\u102d\u1010\u103a\u1000\u102c\u101e\u100a\u103a 10-30ms \u1021\u1010\u103d\u1004\u103a\u1038 \u101c\u100a\u103a\u1015\u1010\u103a\u1015\u103c\u102e\u1038 upstream \u1018\u101b\u102d\u1010\u103a\u1000\u102c\u101e\u100a\u103a \u104e\u1004\u103a\u1038\u104f preset delay \u1021\u1010\u103d\u1000\u103a \u101b\u100a\u103a\u101b\u103d\u101a\u103a\u1001\u103b\u1000\u103a\u101b\u103e\u102d\u101b\u103e\u102d \u1015\u102d\u1010\u103a\u1011\u102c\u1038\u101e\u100a\u103a\u104b downstream \u1018\u101b\u102d\u1010\u103a\u1000\u102c\u101e\u100a\u103a fault \u1000\u102d\u102f \u1021\u1031\u102c\u1004\u103a\u1019\u103c\u1004\u103a\u1005\u103d\u102c\u101b\u103e\u1004\u103a\u1038\u101c\u1004\u103a\u1038\u1015\u102b\u1000 upstream \u1000\u102d\u101b\u102d\u101a\u102c\u101e\u100a\u103a \u1001\u101c\u102f\u1010\u103a\u1019\u1010\u102d\u102f\u1000\u103a\u1015\u102b\u104b downstream \u1000\u102d\u101b\u102d\u101a\u102c\u101e\u100a\u103a \u1015\u103b\u1000\u103a\u1000\u103d\u1000\u103a\u1015\u102b\u1000 \u101e\u102d\u102f\u1037\u1019\u101f\u102f\u1010\u103a fault \u101e\u100a\u103a \u104e\u1004\u103a\u1038\u104f \u1016\u103c\u1010\u103a\u1010\u1031\u102c\u1000\u103a\u1014\u102d\u102f\u1004\u103a\u1005\u103d\u1019\u103a\u1038\u1011\u1000\u103a \u1000\u103b\u1031\u102c\u103a\u101c\u103d\u1014\u103a\u1015\u102b\u1000 upstream \u1018\u101b\u102d\u1010\u103a\u1000\u102c\u101e\u100a\u103a \u104e\u1004\u103a\u1038\u104f delay \u1015\u103c\u102e\u1038\u1014\u1031\u102c\u1000\u103a \u101c\u100a\u103a\u1015\u1010\u103a\u1015\u103c\u102e\u1038 backup \u1000\u102c\u1000\u103d\u101a\u103a\u1019\u103e\u102f\u1000\u102d\u102f \u1015\u1031\u1038\u101e\u100a\u103a\u104b.<\/p>\n

\u1021\u101b\u1031\u1038\u1000\u103c\u102e\u1038\u101e\u1031\u102c\u101c\u102d\u102f\u1021\u1015\u103a\u1001\u103b\u1000\u103a<\/strong>: upstream Category B \u1018\u101b\u102d\u1010\u103a\u1000\u102c\u101e\u100a\u103a delay \u1000\u102c\u101c\u1010\u1005\u103a\u1001\u102f\u101c\u102f\u1036\u1038\u1021\u1010\u103d\u1004\u103a\u1038 fault current \u1000\u102d\u102f \u101b\u103e\u1004\u103a\u101e\u1014\u103a\u1014\u102d\u102f\u1004\u103a\u101b\u1014\u103a \u101c\u102f\u1036\u101c\u1031\u102c\u1000\u103a\u101e\u1031\u102c Icw rating \u101b\u103e\u102d\u101b\u1019\u100a\u103a\u104b \u1021\u102f\u1015\u103a\u1001\u103b\u102f\u1015\u103a\u101e\u100a\u1037\u103a\u100a\u102e\u1019\u103b\u103e\u1001\u103c\u1004\u103a\u1038\u1019\u103e\u102c-<\/p>\n

\u1004\u102b2<\/sup>t(fault) < I2<\/sup>I\u00b2cw \u00d7 t(delay)<\/strong><\/p>\n

I\u00b22<\/sup>t(fault) \u101e\u100a\u103a fault \u1019\u103e thermal energy (current squared \u00d7 time) \u1000\u102d\u102f \u1000\u102d\u102f\u101a\u103a\u1005\u102c\u1038\u1015\u103c\u102f\u1015\u103c\u102e\u1038 I\u00b22<\/sup>cw \u00d7 t(delay) \u101e\u100a\u103a \u1018\u101b\u102d\u1010\u103a\u1000\u102c\u104f \u1001\u1036\u1014\u102d\u102f\u1004\u103a\u101b\u100a\u103a\u1005\u103d\u1019\u103a\u1038\u101b\u100a\u103a\u1000\u102d\u102f \u1000\u102d\u102f\u101a\u103a\u1005\u102c\u1038\u1015\u103c\u102f\u101e\u100a\u103a\u104b.<\/p>\n\n\n\n\n\n\n\n
\u100a\u103e\u102d\u1014\u103e\u102d\u102f\u1004\u103a\u1038\u1019\u103e\u102f\u1021\u1006\u1004\u1037\u103a<\/th>\n\u1005\u1000\u103a\u1021\u1019\u103b\u102d\u102f\u1038\u1021\u1005\u102c\u1038<\/th>\nTrip Delay Setting<\/th>\n30kA Fault \u1010\u103d\u1004\u103a \u101c\u102d\u102f\u1021\u1015\u103a\u101e\u1031\u102c Icw<\/th>\n<\/tr>\n<\/thead>\n
\u1021\u1006\u1004\u1037\u103a \u1043 \u2013 Main Incomer<\/strong><\/td>\nACB 1600A<\/td>\n0.4s delay<\/td>\n0.5s \u1021\u1010\u103d\u1000\u103a 42kA<\/td>\n<\/tr>\n
\u1021\u1006\u1004\u1037\u103a \u1042 \u2013 Sub-distribution<\/strong><\/td>\nMCCB 400A<\/td>\n0.2s delay<\/td>\n0.25s \u1021\u1010\u103d\u1000\u103a 35kA<\/td>\n<\/tr>\n
\u1021\u1006\u1004\u1037\u103a \u1041 \u2013 Feeder<\/strong><\/td>\nMCCB 100A<\/td>\n\u1001\u103b\u1000\u103a\u1001\u103c\u1004\u103a\u1038<\/td>\n\u1019\u101e\u1000\u103a\u1006\u102d\u102f\u1004\u103a\u1015\u102b (Category A)<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n

\u1024 cascade \u1010\u103d\u1004\u103a \u1021\u1006\u1004\u1037\u103a 1 \u1010\u103d\u1004\u103a 30kA fault \u1000\u102d\u102f 100A feeder breaker \u1019\u103e 20ms \u1010\u103d\u1004\u103a \u101b\u103e\u1004\u103a\u1038\u101c\u1004\u103a\u1038\u101e\u100a\u103a\u104b 400A \u1018\u101b\u102d\u1010\u103a\u1000\u102c\u101e\u100a\u103a 0.2s \u1005\u1031\u102c\u1004\u1037\u103a\u101e\u100a\u103a (\u104e\u1004\u103a\u1038\u104f Icw rating \u1021\u101b \u1021\u1014\u100a\u103a\u1038\u1006\u102f\u1036\u1038 0.25s \u1021\u1010\u103d\u1000\u103a 30kA \u1000\u102d\u102f \u1001\u1036\u1014\u102d\u102f\u1004\u103a\u101b\u100a\u103a\u101b\u103e\u102d\u101b\u1019\u100a\u103a)\u104a fault \u1000\u102d\u102f \u101b\u103e\u1004\u103a\u1038\u101c\u1004\u103a\u1038\u101e\u100a\u103a\u1000\u102d\u102f \u1019\u103c\u1004\u103a\u1015\u103c\u102e\u1038 \u1015\u102d\u1010\u103a\u1011\u102c\u1038\u101e\u100a\u103a\u104b 1600A main breaker \u101e\u100a\u103a 0.4s \u1005\u1031\u102c\u1004\u1037\u103a\u101e\u100a\u103a (\u1021\u1014\u100a\u103a\u1038\u1006\u102f\u1036\u1038 0.5s \u1021\u1010\u103d\u1000\u103a 30kA \u1000\u102d\u102f \u1001\u1036\u1014\u102d\u102f\u1004\u103a\u101b\u100a\u103a\u101b\u103e\u102d\u101b\u1019\u100a\u103a)\u104a \u1015\u102d\u1010\u103a\u1011\u102c\u1038\u101e\u100a\u103a\u104b \u101b\u101c\u1012\u103a- fault \u1016\u103c\u1005\u103a\u101e\u1031\u102c feeder \u101e\u102c \u1015\u102b\u101d\u102b\u1006\u102f\u1036\u1038\u101b\u103e\u102f\u1036\u1038\u101e\u100a\u103a\u104b.<\/p>\n

\u1021\u1016\u103c\u1005\u103a\u1019\u103b\u102c\u1038\u101e\u1031\u102c \u1021\u1019\u103e\u102c\u1038<\/strong>: \u1021\u1004\u103a\u1002\u103b\u1004\u103a\u1014\u102e\u101a\u102c\u1019\u103b\u102c\u1038\u101e\u100a\u103a ATS \u1021\u1015\u102b\u1021\u101d\u1004\u103a series-connected equipment \u1021\u102c\u1038\u101c\u102f\u1036\u1038\u101e\u100a\u103a \u101e\u1000\u103a\u1010\u1019\u103a\u1038\u1010\u102d\u102f\u1038\u1011\u102c\u1038\u101e\u1031\u102c fault \u1000\u103c\u102c\u1001\u103b\u102d\u1014\u103a\u1000\u102d\u102f \u1001\u1036\u1014\u102d\u102f\u1004\u103a\u101b\u100a\u103a\u101b\u103e\u102d\u1000\u103c\u1031\u102c\u1004\u103a\u1038 \u1021\u1010\u100a\u103a\u1019\u1015\u103c\u102f\u1018\u1032 \u201c\u100a\u103e\u102d\u1014\u103e\u102d\u102f\u1004\u103a\u1038\u1019\u103e\u102f\u1000\u102d\u102f \u1010\u102d\u102f\u1038\u1010\u1000\u103a\u1005\u1031\u101b\u1014\u103a\u201d \u1021\u1010\u103d\u1000\u103a main breaker \u1010\u103d\u1004\u103a instantaneous trip \u1000\u102d\u102f \u1010\u1005\u103a\u1001\u102b\u1010\u1005\u103a\u101b\u1036 \u1015\u102d\u1010\u103a\u1011\u102c\u1038\u1000\u103c\u101e\u100a\u103a\u104b \u104e\u1004\u103a\u1038\u101e\u100a\u103a delay trip \u1019\u1005\u1010\u1004\u103a\u1019\u102e equipment \u1015\u103b\u1000\u103a\u1005\u102e\u1038\u1019\u103e\u102f\u1016\u103c\u1005\u103a\u1015\u1031\u102b\u103a\u101e\u100a\u1037\u103a \u1000\u102c\u1000\u103d\u101a\u103a\u1019\u103e\u102f\u1000\u103d\u102c\u101f\u1001\u103b\u1000\u103a\u1000\u102d\u102f \u1016\u1014\u103a\u1010\u102e\u1038\u1015\u1031\u1038\u101e\u100a\u103a\u104b.<\/p>\n

2.4 \u1021\u101b\u1031\u1038\u1000\u103c\u102e\u1038\u101e\u1031\u102c \u1005\u1014\u1005\u103a\u1019\u103b\u102c\u1038\u1010\u103d\u1004\u103a \u101b\u103d\u1031\u1038\u1001\u103b\u101a\u103a\u1014\u102d\u102f\u1004\u103a\u1005\u103d\u1019\u103a\u1038- NEC \u1014\u103e\u1004\u1037\u103a \u1021\u101e\u1000\u103a\u1021\u1014\u1039\u1010\u101b\u102c\u101a\u103a\u1000\u1004\u103a\u1038\u101b\u103e\u1004\u103a\u1038\u101b\u1031\u1038 \u101c\u102d\u102f\u1021\u1015\u103a\u1001\u103b\u1000\u103a\u1019\u103b\u102c\u1038<\/h3>\n

National Electrical Code (NEC) Article 700.28 \u101e\u100a\u103a \u1021\u101b\u1031\u1038\u1015\u1031\u102b\u103a\u1005\u1014\u1005\u103a overcurrent \u1000\u102d\u101b\u102d\u101a\u102c\u1019\u103b\u102c\u1038\u1021\u1010\u103d\u1000\u103a \u101b\u103d\u1031\u1038\u1001\u103b\u101a\u103a\u100a\u103e\u102d\u1014\u103e\u102d\u102f\u1004\u103a\u1038\u1019\u103e\u102f\u1000\u102d\u102f \u1019\u1016\u103c\u1005\u103a\u1019\u1014\u1031\u101c\u102d\u102f\u1021\u1015\u103a\u1015\u103c\u102e\u1038 \u201coverload \u1019\u103e \u101b\u101b\u103e\u102d\u1014\u102d\u102f\u1004\u103a\u101e\u1031\u102c \u1021\u1019\u103c\u1004\u1037\u103a\u1006\u102f\u1036\u1038 fault current \u1021\u1011\u102d \u101b\u101b\u103e\u102d\u1014\u102d\u102f\u1004\u103a\u101e\u1031\u102c overcurrent \u1021\u102c\u1038\u101c\u102f\u1036\u1038\u1021\u1010\u103d\u1000\u103a overcurrent \u1000\u102c\u1000\u103d\u101a\u103a\u101b\u1031\u1038\u1000\u102d\u101b\u102d\u101a\u102c\u1019\u103b\u102c\u1038\u1014\u103e\u1004\u1037\u103a \u104e\u1004\u103a\u1038\u1010\u102d\u102f\u1037\u104f ratings \u101e\u102d\u102f\u1037\u1019\u101f\u102f\u1010\u103a settings \u1019\u103b\u102c\u1038\u1000\u102d\u102f \u101b\u103d\u1031\u1038\u1001\u103b\u101a\u103a\u1001\u103c\u1004\u103a\u1038\u1014\u103e\u1004\u1037\u103a \u1010\u1015\u103a\u1006\u1004\u103a\u1001\u103c\u1004\u103a\u1038\u1016\u103c\u1004\u1037\u103a \u1015\u103c\u102e\u1038\u1019\u103c\u1031\u102c\u1000\u103a\u101e\u1031\u102c \u100a\u103e\u102d\u1014\u103e\u102d\u102f\u1004\u103a\u1038\u1019\u103e\u102f\u201d \u101c\u102d\u102f\u1021\u1015\u103a\u101e\u100a\u103a\u104b \u1021\u101c\u102c\u1038\u1010\u1030\u101c\u102d\u102f\u1021\u1015\u103a\u1001\u103b\u1000\u103a\u1019\u103b\u102c\u1038\u101e\u100a\u103a \u1000\u103b\u1014\u103a\u1038\u1019\u102c\u101b\u1031\u1038\u1005\u1031\u102c\u1004\u1037\u103a\u101b\u103e\u1031\u102c\u1000\u103a\u1019\u103e\u102f\u1006\u102d\u102f\u1004\u103a\u101b\u102c \u1021\u1006\u1031\u102c\u1000\u103a\u1021\u1021\u102f\u1036\u1019\u103b\u102c\u1038\u1021\u1010\u103d\u1000\u103a NEC Article 517 \u1014\u103e\u1004\u1037\u103a \u1021\u101b\u1031\u1038\u1000\u103c\u102e\u1038\u101e\u1031\u102c \u101c\u100a\u103a\u1015\u1010\u103a\u1019\u103e\u102f\u1015\u102b\u101d\u102b\u1005\u1014\u1005\u103a\u1019\u103b\u102c\u1038\u1021\u1010\u103d\u1000\u103a Article 708 \u1010\u103d\u1004\u103a \u1010\u100a\u103a\u101b\u103e\u102d\u101e\u100a\u103a\u104b.<\/p>\n

\u1024\u1000\u102f\u1012\u103a\u101c\u102d\u102f\u1021\u1015\u103a\u1001\u103b\u1000\u103a\u1019\u103b\u102c\u1038\u101e\u100a\u103a ATS \u101e\u1010\u103a\u1019\u103e\u1010\u103a\u1001\u103b\u1000\u103a\u1017\u103b\u1030\u101f\u102c\u1019\u103b\u102c\u1038\u1000\u102d\u102f \u1021\u1001\u103c\u1031\u1001\u1036\u1021\u102c\u1038\u1016\u103c\u1004\u1037\u103a \u101e\u1000\u103a\u101b\u1031\u102c\u1000\u103a\u1019\u103e\u102f\u101b\u103e\u102d\u101e\u100a\u103a\u104b \u1021\u101b\u1031\u1038\u1015\u1031\u102b\u103a\u1015\u102b\u101d\u102b\u1016\u103c\u1014\u1037\u103a\u1016\u103c\u1030\u1038\u1019\u103e\u102f\u1010\u103d\u1004\u103a \u1000\u102f\u1012\u103a\u1014\u103e\u1004\u1037\u103a\u1000\u102d\u102f\u1000\u103a\u100a\u102e\u101e\u1031\u102c \u101b\u103d\u1031\u1038\u1001\u103b\u101a\u103a\u100a\u103e\u102d\u1014\u103e\u102d\u102f\u1004\u103a\u1038\u1019\u103e\u102f\u1000\u102d\u102f \u101b\u101b\u103e\u102d\u101b\u1014\u103a \u1021\u1004\u103a\u1002\u103b\u1004\u103a\u1014\u102e\u101a\u102c\u1019\u103b\u102c\u1038\u101e\u100a\u103a ATS \u1000\u102d\u102f \u101d\u1014\u103a\u1006\u1031\u102c\u1004\u103a\u1019\u103e\u102f\u1015\u1031\u1038\u101e\u1031\u102c upstream \u1018\u101b\u102d\u1010\u103a\u1000\u102c\u1019\u103b\u102c\u1038\u1010\u103d\u1004\u103a instantaneous trip function \u1000\u102d\u102f \u1019\u1000\u103c\u102c\u1001\u100f \u1015\u102d\u1010\u103a\u1011\u102c\u1038\u101b\u1019\u100a\u103a \u101e\u102d\u102f\u1037\u1019\u101f\u102f\u1010\u103a \u101e\u102d\u101e\u102d\u101e\u102c\u101e\u102c \u1014\u103e\u1031\u102c\u1004\u1037\u103a\u1014\u103e\u1031\u1038\u101b\u1019\u100a\u103a\u1016\u103c\u1005\u103a\u101e\u100a\u103a\u104b 40kA fault \u1021\u1010\u103d\u1004\u103a\u1038 1-2 cycles (16-32ms) \u1010\u103d\u1004\u103a \u1015\u102f\u1036\u1019\u103e\u1014\u103a\u1021\u102c\u1038\u1016\u103c\u1004\u1037\u103a \u1001\u101c\u102f\u1010\u103a\u1010\u102d\u102f\u1000\u103a\u1019\u100a\u1037\u103a main breaker \u1000\u102d\u102f downstream \u1021\u101b\u1031\u1038\u1015\u1031\u102b\u103a feeders \u1019\u103b\u102c\u1038\u1014\u103e\u1004\u1037\u103a \u100a\u103e\u102d\u1014\u103e\u102d\u102f\u1004\u103a\u1038\u101b\u1014\u103a 0.3 \u1005\u1000\u1039\u1000\u1014\u1037\u103a \u1014\u103e\u1031\u102c\u1004\u1037\u103a\u1014\u103e\u1031\u1038\u101b\u1014\u103a \u101e\u1010\u103a\u1019\u103e\u1010\u103a\u1014\u102d\u102f\u1004\u103a\u101e\u100a\u103a\u104b.<\/p>\n

\u104e\u1004\u103a\u1038\u101e\u100a\u103a \u100a\u103e\u102d\u1014\u103e\u102d\u102f\u1004\u103a\u1038\u1019\u103e\u102f paradox \u1000\u102d\u102f \u1016\u1014\u103a\u1010\u102e\u1038\u101e\u100a\u103a- \u1000\u102f\u1012\u103a\u1014\u103e\u1004\u1037\u103a\u1000\u102d\u102f\u1000\u103a\u100a\u102e\u101e\u1031\u102c \u101b\u103d\u1031\u1038\u1001\u103b\u101a\u103a\u1014\u102d\u102f\u1004\u103a\u1005\u103d\u1019\u103a\u1038\u1021\u1010\u103d\u1000\u103a \u101c\u102d\u102f\u1021\u1015\u103a\u101e\u1031\u102c delay \u1019\u103b\u102c\u1038\u101e\u100a\u103a ATS \u1000\u102d\u102f \u1005\u1036 3-cycle \u1001\u1036\u1014\u102d\u102f\u1004\u103a\u101b\u100a\u103a ratings \u1019\u103b\u102c\u1038 \u1019\u101b\u103e\u1004\u103a\u101e\u1014\u103a\u1014\u102d\u102f\u1004\u103a\u101e\u1031\u102c \u101e\u1000\u103a\u1010\u1019\u103a\u1038\u1010\u102d\u102f\u1038\u1011\u102c\u1038\u101e\u1031\u102c fault \u1011\u102d\u1010\u103d\u1031\u1037\u1019\u103e\u102f\u1014\u103e\u1004\u1037\u103a \u101e\u1000\u103a\u101b\u1031\u102c\u1000\u103a\u1005\u1031\u101e\u100a\u103a\u104b. \u101c\u103d\u103e\u1032\u1015\u103c\u1031\u102c\u1004\u103a\u1038\u1001\u101c\u102f\u1010\u103a \u101d\u102b\u101a\u102c\u101b\u103e\u1031\u102c\u1037 ratings \u1019\u103b\u102c\u1038\u1000\u102d\u102f \u1014\u102c\u1038\u101c\u100a\u103a\u1001\u103c\u1004\u103a\u1038<\/a> \u1021\u101b\u1031\u1038\u1015\u1031\u102b\u103a\u1005\u1014\u1005\u103a\u1012\u102e\u1007\u102d\u102f\u1004\u103a\u1038\u1010\u103d\u1004\u103a \u101b\u103d\u1031\u1038\u1001\u103b\u101a\u103a\u1001\u103d\u1004\u1037\u103a\u1019\u101f\u102f\u1010\u103a\u1018\u1032 \u1019\u1016\u103c\u1005\u103a\u1019\u1014\u1031 \u101c\u102d\u102f\u1021\u1015\u103a\u101c\u102c\u1015\u102b\u101e\u100a\u103a\u104b \u101e\u1004\u103a\u101e\u100a\u103a \u100a\u103e\u102d\u1014\u103e\u102d\u102f\u1004\u103a\u1038\u1019\u103e\u102f\u1014\u103e\u1031\u102c\u1004\u1037\u103a\u1014\u103e\u1031\u1038\u1019\u103e\u102f\u1000\u102d\u102f \u1001\u1036\u1014\u102d\u102f\u1004\u103a\u101b\u100a\u103a\u101b\u103e\u102d\u101e\u1031\u102c short-time rated ATS \u101a\u1030\u1014\u1005\u103a\u1019\u103b\u102c\u1038\u1000\u102d\u102f \u101e\u1010\u103a\u1019\u103e\u1010\u103a\u101b\u1019\u100a\u103a \u101e\u102d\u102f\u1037\u1019\u101f\u102f\u1010\u103a \u1021\u1001\u103b\u102d\u1014\u103a\u1014\u103e\u1031\u102c\u1004\u1037\u103a\u1014\u103e\u1031\u1038\u1019\u103e\u102f\u1019\u101b\u103e\u102d\u1018\u1032 \u1019\u1030\u101c\u101b\u103d\u1031\u1038\u1001\u103b\u101a\u103a\u1014\u102d\u102f\u1004\u103a\u1005\u103d\u1019\u103a\u1038\u1000\u102d\u102f \u1015\u1031\u1038\u1005\u103d\u1019\u103a\u1038\u1014\u102d\u102f\u1004\u103a\u101e\u1031\u102c current-limiting devices (\u1016\u103b\u1030\u1038\u1019\u103b\u102c\u1038) \u1000\u102d\u102f \u1021\u101e\u102f\u1036\u1038\u1015\u103c\u102f\u104d \u1000\u102c\u1000\u103d\u101a\u103a\u101b\u1031\u1038\u1021\u1005\u102e\u1021\u1005\u1009\u103a\u1000\u102d\u102f \u1015\u103c\u1014\u103a\u101c\u100a\u103a\u1012\u102e\u1007\u102d\u102f\u1004\u103a\u1038\u1006\u103d\u1032\u101b\u1019\u100a\u103a\u104b.<\/p>\n

Pro Tip<\/strong>\u1021\u101b\u1031\u1038\u1015\u1031\u102b\u103a\u1005\u1014\u1005\u103a\u1019\u103b\u102c\u1038\u1021\u1010\u103d\u1000\u103a breaker \u1006\u1000\u103a\u1010\u1004\u103a\u1019\u103b\u102c\u1038\u1000\u102d\u102f \u1021\u1015\u103c\u102e\u1038\u101e\u1010\u103a\u1019\u101e\u1010\u103a\u1019\u103e\u1010\u103a\u1019\u102e\u104a ATS short-circuit withstand rating \u1000\u102d\u102f \u1000\u1014\u1037\u103a\u101e\u1010\u103a\u1001\u103b\u1000\u103a\u1021\u1016\u103c\u1005\u103a \u1011\u100a\u1037\u103a\u101e\u103d\u1004\u103a\u1038\u1011\u102c\u1038\u101e\u1031\u102c \u1015\u103c\u102e\u1038\u1015\u103c\u100a\u1037\u103a\u1005\u102f\u1036\u101e\u1031\u102c \u100a\u103e\u102d\u1014\u103e\u102d\u102f\u1004\u103a\u1038\u1019\u103e\u102f\u101c\u1031\u1037\u101c\u102c\u1019\u103e\u102f\u1000\u102d\u102f \u1015\u103c\u102f\u101c\u102f\u1015\u103a\u1015\u102b\u104b \u1021\u1004\u103a\u1002\u103b\u1004\u103a\u1014\u102e\u101a\u102c\u1021\u1019\u103b\u102c\u1038\u1021\u1015\u103c\u102c\u1038\u101e\u100a\u103a \u104e\u1004\u103a\u1038\u1010\u102d\u102f\u1037\u101b\u103d\u1031\u1038\u1001\u103b\u101a\u103a\u1011\u102c\u1038\u101e\u1031\u102c breaker \u1006\u1000\u103a\u1010\u1004\u103a\u1019\u103b\u102c\u1038\u1016\u103c\u1004\u1037\u103a NEC 700.28 \u101c\u102d\u102f\u1000\u103a\u1014\u102c\u1019\u103e\u102f\u1000\u102d\u102f \u101b\u101b\u103e\u102d\u101b\u1014\u103a\u1021\u1010\u103d\u1000\u103a \u1015\u102d\u102f\u1019\u102d\u102f\u1005\u103b\u1031\u1038\u1000\u103c\u102e\u1038\u101e\u1031\u102c short-time rated transfer switch \u101e\u102d\u102f\u1037 \u1021\u1006\u1004\u1037\u103a\u1019\u103c\u103e\u1004\u1037\u103a\u1010\u1004\u103a\u101b\u1014\u103a \u101c\u102d\u102f\u1021\u1015\u103a\u1000\u103c\u1031\u102c\u1004\u103a\u1038 \u1014\u1031\u102c\u1000\u103a\u1000\u103b\u1019\u103e \u101e\u102d\u101b\u103e\u102d\u1000\u103c\u101e\u100a\u103a\u2014\u1021\u1005\u1031\u102c\u1015\u102d\u102f\u1004\u103a\u1038\u1021\u1006\u1004\u1037\u103a \u100a\u103e\u102d\u1014\u103e\u102d\u102f\u1004\u103a\u1038\u1019\u103e\u102f\u1001\u103d\u1032\u1001\u103c\u1019\u103a\u1038\u1005\u102d\u1010\u103a\u1016\u103c\u102c\u1001\u103c\u1004\u103a\u1038\u1016\u103c\u1004\u1037\u103a \u101b\u103e\u1031\u102c\u1004\u103a\u101b\u103e\u102c\u1038\u1014\u102d\u102f\u1004\u103a\u101e\u1031\u102c \u1015\u103c\u1031\u102c\u1004\u103a\u1038\u101c\u1032\u1019\u103e\u102f\u1021\u1019\u102d\u1014\u1037\u103a\u1016\u103c\u1005\u103a\u101e\u100a\u103a\u104b.<\/p>\n

\u1021\u1015\u102d\u102f\u1004\u103a\u1038 \u1043- ATS Short-Circuit Ratings \u1014\u103e\u1004\u1037\u103a \u100a\u103e\u102d\u1014\u103e\u102d\u102f\u1004\u103a\u1038\u1019\u103e\u102f\u101c\u102d\u102f\u1021\u1015\u103a\u1001\u103b\u1000\u103a\u1019\u103b\u102c\u1038<\/h2>\n

3.1 ATS Withstand and Closing Ratings (WCR): \u1021\u1001\u103c\u1031\u1001\u1036\u1019\u103b\u102c\u1038\u1000\u102d\u102f \u1014\u102c\u1038\u101c\u100a\u103a\u1001\u103c\u1004\u103a\u1038<\/h3>\n

\u1021\u101c\u102d\u102f\u1021\u101c\u103b\u1031\u102c\u1000\u103a transfer switch \u1010\u102d\u102f\u1004\u103a\u1038\u1010\u103d\u1004\u103a \u1015\u102b\u101b\u103e\u102d\u101e\u100a\u103a withstand and closing rating (WCR)<\/strong> \u101e\u1010\u103a\u1019\u103e\u1010\u103a\u1011\u102c\u1038\u101e\u1031\u102c overcurrent protective device (OCPD) \u1016\u103c\u1004\u1037\u103a \u1000\u102c\u1000\u103d\u101a\u103a\u1011\u102c\u1038\u101e\u100a\u1037\u103a\u1021\u1001\u102b transfer switch \u101e\u100a\u103a \u1018\u1031\u1038\u1000\u1004\u103a\u1038\u1005\u103d\u102c \u1001\u1036\u1014\u102d\u102f\u1004\u103a\u101b\u100a\u103a\u101b\u103e\u102d\u1014\u102d\u102f\u1004\u103a\u101e\u1031\u102c \u1021\u1019\u103c\u1004\u1037\u103a\u1006\u102f\u1036\u1038\u1016\u103c\u1005\u103a\u1014\u102d\u102f\u1004\u103a\u1001\u103b\u1031\u101b\u103e\u102d\u101e\u1031\u102c short-circuit current \u1000\u102d\u102f \u101e\u1010\u103a\u1019\u103e\u1010\u103a\u1015\u1031\u1038\u101e\u100a\u103a\u104b \u1024\u1021\u1006\u1004\u1037\u103a\u101e\u1010\u103a\u1019\u103e\u1010\u103a\u1001\u103b\u1000\u103a\u101e\u100a\u103a \u101e\u102e\u1038\u1001\u103c\u102c\u1038\u1000\u102d\u101b\u102d\u101a\u102c\u1005\u103d\u1019\u103a\u1038\u101b\u100a\u103a\u1019\u101f\u102f\u1010\u103a\u1015\u102b\u2014\u104e\u1004\u103a\u1038\u101e\u100a\u103a ATS \u1014\u103e\u1004\u1037\u103a upstream \u1000\u102c\u1000\u103d\u101a\u103a\u1019\u103e\u102f\u104f \u101e\u102e\u1038\u1001\u103c\u102c\u1038\u1021\u1019\u103b\u102d\u102f\u1038\u1021\u1005\u102c\u1038\u1019\u103b\u102c\u1038\u1014\u103e\u1004\u1037\u103a \u1006\u1000\u103a\u1010\u1004\u103a\u1019\u103b\u102c\u1038\u104f \u1005\u1019\u103a\u1038\u101e\u1015\u103a\u1015\u103c\u102e\u1038 \u1021\u101e\u102d\u1021\u1019\u103e\u1010\u103a\u1015\u103c\u102f\u1011\u102c\u1038\u101e\u1031\u102c \u1015\u1031\u102b\u1004\u103a\u1038\u1005\u1015\u103a\u1019\u103e\u102f\u1000\u102d\u102f \u1000\u102d\u102f\u101a\u103a\u1005\u102c\u1038\u1015\u103c\u102f\u101e\u100a\u103a\u104b.<\/p>\n

Standard ATS ratings \u1019\u103b\u102c\u1038\u101e\u100a\u103a \u1021\u1019\u103b\u102c\u1038\u1021\u102c\u1038\u1016\u103c\u1004\u1037\u103a \u1021\u1001\u103c\u1031\u1001\u1036\u1011\u102c\u1038\u101e\u100a\u103a 3-cycle withstand testing<\/strong> (60Hz \u1010\u103d\u1004\u103a \u1001\u1014\u1037\u103a\u1019\u103e\u1014\u103a\u1038\u1001\u103c\u1031\u1021\u102c\u1038\u1016\u103c\u1004\u1037\u103a 50 milliseconds)\u104a \u1011\u102d\u102f\u1021\u1001\u103b\u102d\u1014\u103a\u1021\u1010\u103d\u1004\u103a\u1038 transfer switch \u101e\u100a\u103a upstream OCPD \u101e\u100a\u103a contact welding\u104a insulation failure \u101e\u102d\u102f\u1037\u1019\u101f\u102f\u1010\u103a mechanical damage \u1019\u1016\u103c\u1005\u103a\u1015\u1031\u102b\u103a\u1005\u1031\u1018\u1032 \u1016\u103d\u1004\u1037\u103a\u1014\u1031\u1005\u1009\u103a\u1021\u1010\u103d\u1004\u103a\u1038 fault current \u1000\u102d\u102f \u1001\u1036\u1014\u102d\u102f\u1004\u103a\u101b\u100a\u103a\u101b\u103e\u102d\u101b\u1019\u100a\u103a\u104b \u1005\u1019\u103a\u1038\u101e\u1015\u103a\u1001\u103c\u1004\u103a\u1038\u101e\u100a\u103a \u101c\u1000\u103a\u101b\u103e\u102d faults \u1019\u103b\u102c\u1038\u1015\u1031\u102b\u103a\u101e\u102d\u102f\u1037 \u1015\u102d\u1010\u103a\u1001\u103c\u1004\u103a\u1038\u1014\u103e\u1004\u1037\u103a contacts \u1019\u103b\u102c\u1038\u1015\u102d\u1010\u103a\u1011\u102c\u1038\u1005\u1009\u103a \u1016\u103c\u1005\u103a\u1015\u1031\u102b\u103a\u1014\u1031\u101e\u1031\u102c faults \u1019\u103b\u102c\u1038\u1021\u1015\u102b\u1021\u101d\u1004\u103a \u1021\u1006\u102d\u102f\u1038\u1006\u102f\u1036\u1038 fault \u1021\u1001\u103c\u1031\u1021\u1014\u1031\u1019\u103b\u102c\u1038\u101e\u102d\u102f\u1037 \u1005\u1000\u103a\u1015\u1005\u1039\u1005\u100a\u103a\u1038\u1000\u102d\u102f \u1011\u102d\u1010\u103d\u1031\u1037\u1005\u1031\u101e\u1031\u102c UL 1008 (Transfer Switch Equipment \u1021\u1010\u103d\u1000\u103a \u1005\u1036\u1014\u103e\u102f\u1014\u103a\u1038) protocols \u1019\u103b\u102c\u1038\u1000\u102d\u102f \u101c\u102d\u102f\u1000\u103a\u1014\u102c\u101e\u100a\u103a\u104b.<\/p>\n

ATS \u1011\u102f\u1010\u103a\u101c\u102f\u1015\u103a\u101e\u1030\u104f \u1014\u100a\u103a\u1038\u1015\u100a\u102c\u1006\u102d\u102f\u1004\u103a\u101b\u102c\u1021\u1001\u103b\u1000\u103a\u1021\u101c\u1000\u103a\u1019\u103b\u102c\u1038\u101e\u100a\u103a WCR \u1000\u102d\u102f \u1015\u102f\u1036\u1005\u1036\u1014\u103e\u1005\u103a\u1019\u103b\u102d\u102f\u1038\u1016\u103c\u1004\u1037\u103a \u1010\u1004\u103a\u1015\u103c\u101c\u1031\u1037\u101b\u103e\u102d\u101e\u100a\u103a-<\/p>\n

\u201cSpecific breaker\u201d ratings<\/strong> explicitly \u1016\u1031\u102c\u103a\u1011\u102f\u1010\u103a\u1011\u102c\u1038\u101e\u1031\u102c circuit breaker \u1019\u1031\u102c\u103a\u1012\u101a\u103a\u1019\u103b\u102c\u1038\u104a ratings \u1019\u103b\u102c\u1038\u1014\u103e\u1004\u1037\u103a trip \u1006\u1000\u103a\u1010\u1004\u103a\u1019\u103b\u102c\u1038\u1014\u103e\u1004\u1037\u103a\u1021\u1010\u1030 \u1021\u101e\u102f\u1036\u1038\u1015\u103c\u102f\u101b\u1014\u103a\u1021\u1010\u103d\u1000\u103a ATS \u1000\u102d\u102f \u1021\u101e\u102d\u1021\u1019\u103e\u1010\u103a\u1015\u103c\u102f\u101e\u100a\u103a\u104b \u1025\u1015\u1019\u102c- \u201cSquare D Model HDA36100\u104a 100A frame\u104a magnetic trip set at 10\u00d7In\u104a instantaneous trip enabled \u1016\u103c\u1004\u1037\u103a \u1000\u102c\u1000\u103d\u101a\u103a\u1011\u102c\u1038\u101e\u100a\u1037\u103a\u1021\u1001\u102b 100kA SCCR\u201d \u104e\u1004\u103a\u1038\u101e\u100a\u103a \u1021\u1019\u103c\u1004\u1037\u103a\u1006\u102f\u1036\u1038 rating \u1000\u102d\u102f \u1015\u1031\u1038\u1005\u103d\u1019\u103a\u1038\u1014\u102d\u102f\u1004\u103a\u101e\u1031\u102c\u103a\u101c\u100a\u103a\u1038 \u1012\u102e\u1007\u102d\u102f\u1004\u103a\u1038\u1015\u103c\u1031\u102c\u1004\u103a\u1038\u101c\u103d\u101a\u103a\u1015\u103c\u1004\u103a\u101c\u103d\u101a\u103a\u1019\u103e\u102f\u1000\u102d\u102f \u1000\u1014\u1037\u103a\u101e\u1010\u103a\u1011\u102c\u1038\u101e\u100a\u103a\u104b.<\/p>\n

\u201cAny breaker\u201d ratings<\/strong> \u101e\u1010\u103a\u1019\u103e\u1010\u103a\u1011\u102c\u1038\u101e\u1031\u102c \u101c\u1000\u1039\u1001\u100f\u102c\u101b\u1015\u103a\u1019\u103b\u102c\u1038\u1014\u103e\u1004\u1037\u103a \u1000\u102d\u102f\u1000\u103a\u100a\u102e\u101e\u1031\u102c \u1019\u100a\u103a\u101e\u100a\u1037\u103a circuit breaker \u1014\u103e\u1004\u1037\u103a\u1019\u1006\u102d\u102f \u1021\u101e\u102f\u1036\u1038\u1015\u103c\u102f\u101b\u1014\u103a\u1021\u1010\u103d\u1000\u103a ATS \u1000\u102d\u102f \u1021\u101e\u102d\u1021\u1019\u103e\u1010\u103a\u1015\u103c\u102f\u101e\u100a\u103a\u2014\u1015\u102f\u1036\u1019\u103e\u1014\u103a\u1021\u102c\u1038\u1016\u103c\u1004\u1037\u103a instantaneous trip capability \u1014\u103e\u1004\u1037\u103a 3-cycle clearing \u101c\u102d\u102f\u1021\u1015\u103a\u101e\u100a\u103a\u104b \u1025\u1015\u1019\u102c- \u201cinstantaneous trip \u1014\u103e\u1004\u1037\u103a 3-cycle maximum clearing time \u1015\u102b\u101b\u103e\u102d\u101e\u1031\u102c \u2265100A rated \u1019\u100a\u103a\u101e\u100a\u1037\u103a circuit breaker \u1016\u103c\u1004\u1037\u103a \u1000\u102c\u1000\u103d\u101a\u103a\u1011\u102c\u1038\u101e\u100a\u1037\u103a\u1021\u1001\u102b 42kA SCCR\u201d \u104e\u1004\u103a\u1038\u101e\u100a\u103a \u1012\u102e\u1007\u102d\u102f\u1004\u103a\u1038\u1015\u103c\u1031\u102c\u1004\u103a\u1038\u101c\u103d\u101a\u103a\u1015\u103c\u1004\u103a\u101c\u103d\u101a\u103a\u1019\u103e\u102f\u1000\u102d\u102f \u1015\u1031\u1038\u1005\u103d\u1019\u103a\u1038\u1014\u102d\u102f\u1004\u103a\u101e\u1031\u102c\u103a\u101c\u100a\u103a\u1038 fault current ratings \u101c\u103b\u1031\u102c\u1037\u1014\u100a\u103a\u1038\u101e\u103d\u102c\u1038\u1010\u1010\u103a\u101e\u100a\u103a\u104b.<\/p>\n

\u1005\u102e\u1038\u1015\u103d\u102c\u1038\u1016\u103c\u1005\u103a\u1014\u103e\u1004\u1037\u103a \u1015\u1031\u102b\u1037\u1015\u102b\u1038\u101e\u1031\u102c \u1005\u1000\u103a\u1019\u103e\u102f ATS \u101a\u1030\u1014\u1005\u103a\u1019\u103b\u102c\u1038\u1021\u1010\u103d\u1000\u103a \u1021\u101e\u102f\u1036\u1038\u1019\u103b\u102c\u1038\u101e\u1031\u102c WCR \u1010\u1014\u103a\u1016\u102d\u102f\u1038\u1019\u103b\u102c\u1038\u101e\u100a\u103a 10kA \u1019\u103e 100kA \u1021\u1011\u102d\u101b\u103e\u102d\u1015\u103c\u102e\u1038 \u1015\u102f\u1036\u1019\u103e\u1014\u103a ratings \u1019\u103b\u102c\u1038\u1019\u103e\u102c frame \u1021\u101b\u103d\u101a\u103a\u1021\u1005\u102c\u1038\u1014\u103e\u1004\u1037\u103a \u1010\u100a\u103a\u1006\u1031\u102c\u1000\u103a\u1019\u103e\u102f\u1015\u1031\u102b\u103a\u1019\u1030\u1010\u100a\u103a\u104d 22kA, 42kA, 65kA \u1014\u103e\u1004\u1037\u103a 85kA \u1010\u102d\u102f\u1037\u1016\u103c\u1005\u103a\u101e\u100a\u103a\u104b<\/p>\n\n\n\n\n\n\n\n\n
ATS Frame \u1021\u101b\u103d\u101a\u103a\u1021\u1005\u102c\u1038<\/th>\n\u1015\u102f\u1036\u1019\u103e\u1014\u103a 3-Cycle WCR Range<\/th>\n\u1021\u101e\u102f\u1036\u1038\u1019\u103b\u102c\u1038\u101e\u1031\u102c OCPD \u101c\u102d\u102f\u1021\u1015\u103a\u1001\u103b\u1000\u103a<\/th>\n<\/tr>\n<\/thead>\n
30-100A<\/strong><\/td>\n10-35 kA<\/td>\n\u1019\u100a\u103a\u101e\u100a\u1037\u103a breaker\u104a instantaneous trip<\/td>\n<\/tr>\n
150-400A<\/strong><\/td>\n22-65 kA<\/td>\nSpecific breaker \u101e\u102d\u102f\u1037\u1019\u101f\u102f\u1010\u103a current-limiting fuse<\/td>\n<\/tr>\n
600-1200A<\/strong><\/td>\n42-100 kA<\/td>\n\u1019\u103e\u1010\u103a\u1010\u1019\u103a\u1038\u1010\u1004\u103a\u1011\u102c\u1038\u101e\u1031\u102c \u1006\u1000\u103a\u1010\u1004\u103a\u1019\u103b\u102c\u1038\u1015\u102b\u101b\u103e\u102d\u101e\u1031\u102c Specific breaker<\/td>\n<\/tr>\n
1600-3000A<\/strong><\/td>\n65-200 kA<\/td>\nEngineered coordination\u104a \u1019\u1000\u103c\u102c\u1001\u100f fused<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n

Pro Tip<\/strong>\u201cany breaker\u201d \u101f\u1030\u101e\u1031\u102c\u1021\u101e\u102f\u1036\u1038\u1021\u1014\u103e\u102f\u1014\u103a\u1038\u101e\u100a\u103a \u1021\u1014\u100a\u103a\u1038\u1004\u101a\u103a \u101c\u1019\u103a\u1038\u101c\u103d\u1032\u1005\u1031\u101e\u100a\u103a\u2014\u104e\u1004\u103a\u1038\u101e\u100a\u103a \u1021\u1019\u103e\u1014\u103a\u1010\u1000\u101a\u103a\u1021\u102c\u1038\u1016\u103c\u1004\u1037\u103a \u201c3 cycles \u101e\u102d\u102f\u1037\u1019\u101f\u102f\u1010\u103a \u1011\u102d\u102f\u1011\u1000\u103a\u1014\u100a\u103a\u1038\u101e\u1031\u102c\u1021\u1001\u103b\u102d\u1014\u103a\u1021\u1010\u103d\u1004\u103a\u1038\u101b\u103e\u1004\u103a\u1038\u101c\u1004\u103a\u1038\u101e\u1031\u102c instantaneous trip \u1015\u102b\u101b\u103e\u102d\u101e\u1031\u102c \u1019\u100a\u103a\u101e\u100a\u1037\u103a breaker\u201d \u1000\u102d\u102f\u1006\u102d\u102f\u101c\u102d\u102f\u101e\u100a\u103a\u104b \u104e\u1004\u103a\u1038\u101e\u100a\u103a short-time delays \u1016\u103c\u1004\u1037\u103a \u1016\u103d\u1032\u1037\u1005\u100a\u103a\u1038\u1011\u102c\u1038\u101e\u1031\u102c Category B breakers \u1019\u103b\u102c\u1038\u1000\u102d\u102f \u1016\u101a\u103a\u1011\u102f\u1010\u103a\u1011\u102c\u1038\u1015\u103c\u102e\u1038\u104a selective coordination \u1000\u102d\u102f \u101b\u101b\u103e\u102d\u101b\u1014\u103a \u1000\u103c\u102d\u102f\u1038\u1005\u102c\u1038\u101e\u1031\u102c\u1021\u1001\u102b \u1021\u1004\u103a\u1002\u103b\u1004\u103a\u1014\u102e\u101a\u102c\u1021\u1019\u103b\u102c\u1038\u1021\u1015\u103c\u102c\u1038\u1000\u102d\u102f \u1021\u1036\u1037\u1021\u102c\u1038\u101e\u1004\u1037\u103a\u1005\u1031\u101e\u1031\u102c \u1000\u1014\u1037\u103a\u101e\u1010\u103a\u1001\u103b\u1000\u103a\u1016\u103c\u1005\u103a\u101e\u100a\u103a\u104b.<\/p>\n

3.2 Short-Time Rated ATS: Time-Delayed Coordination \u1021\u1010\u103d\u1000\u103a \u1021\u1004\u103a\u1002\u103b\u1004\u103a\u1014\u102e\u101a\u102c\u1006\u102d\u102f\u1004\u103a\u101b\u102c \u1016\u103c\u1031\u101b\u103e\u1004\u103a\u1038\u1014\u100a\u103a\u1038\u1019\u103b\u102c\u1038<\/h3>\n

\u101b\u100a\u103a\u101b\u103d\u101a\u103a\u1001\u103b\u1000\u103a\u101b\u103e\u102d\u101b\u103e\u102d \u1021\u1001\u103b\u102d\u1014\u103a\u1014\u103e\u1031\u102c\u1004\u1037\u103a\u1014\u103e\u1031\u1038\u1019\u103e\u102f\u1019\u103b\u102c\u1038\u1000\u102d\u102f \u1021\u101e\u102f\u1036\u1038\u1015\u103c\u102f\u1011\u102c\u1038\u101e\u1031\u102c Category B circuit breakers \u1019\u103b\u102c\u1038\u1014\u103e\u1004\u1037\u103a \u100a\u103e\u102d\u1014\u103e\u102d\u102f\u1004\u103a\u1038\u1019\u103e\u102f\u1000\u102d\u102f \u1016\u103d\u1004\u1037\u103a\u101b\u1014\u103a\u1021\u1010\u103d\u1000\u103a ATS \u1011\u102f\u1010\u103a\u101c\u102f\u1015\u103a\u101e\u1030\u1019\u103b\u102c\u1038\u101e\u100a\u103a short-time rated transfer switches<\/strong> 30 cycles (0.5 \u1005\u1000\u1039\u1000\u1014\u1037\u103a) \u1021\u1011\u102d \u1000\u103c\u102c\u101b\u103e\u100a\u103a\u1001\u1036\u1014\u102d\u102f\u1004\u103a\u101e\u1031\u102c \u101e\u1010\u103a\u1019\u103e\u1010\u103a\u1011\u102c\u1038\u101e\u1031\u102c fault currents \u1019\u103b\u102c\u1038\u1000\u102d\u102f \u1001\u1036\u1014\u102d\u102f\u1004\u103a\u101b\u100a\u103a\u101b\u103e\u102d\u1005\u1031\u101b\u1014\u103a \u1005\u1019\u103a\u1038\u101e\u1015\u103a\u1011\u102c\u1038\u101e\u100a\u103a\u104b \u1024\u1021\u1011\u1030\u1038\u1015\u103c\u102f\u101a\u1030\u1014\u1005\u103a\u1019\u103b\u102c\u1038\u101e\u100a\u103a standard transfer switches \u1019\u103b\u102c\u1038\u1000\u102d\u102f \u1016\u103b\u1000\u103a\u1006\u102e\u1038\u1014\u102d\u102f\u1004\u103a\u101e\u100a\u1037\u103a \u1000\u103c\u102c\u101b\u103e\u100a\u103a\u1001\u1036 fault \u1021\u1001\u103c\u1031\u1021\u1014\u1031\u1019\u103b\u102c\u1038\u1021\u1010\u103d\u1004\u103a\u1038 contact integrity\u104a arc interruption capability \u1014\u103e\u1004\u1037\u103a structural stability \u1010\u102d\u102f\u1037\u1000\u102d\u102f \u1021\u1010\u100a\u103a\u1015\u103c\u102f\u1015\u1031\u1038\u101e\u1031\u102c UL 1008 \u1015\u103c\u100b\u1039\u100c\u102c\u1014\u103a\u1038\u1001\u103b\u1000\u103a\u1019\u103b\u102c\u1038\u1021\u101b \u1010\u1004\u103a\u1038\u1000\u103b\u1015\u103a\u101e\u1031\u102c \u1005\u1019\u103a\u1038\u101e\u1015\u103a\u1019\u103e\u102f\u1019\u103b\u102c\u1038\u1000\u102d\u102f \u1001\u1036\u101a\u1030\u1000\u103c\u101e\u100a\u103a\u104b.<\/p>\n

\u1015\u102f\u1036\u1019\u103e\u1014\u103a short-time ratings \u1019\u103b\u102c\u1038\u101e\u100a\u103a \u1019\u103c\u1004\u1037\u103a\u1019\u102c\u1038\u101e\u1031\u102c currents \u1019\u103b\u102c\u1038\u1000\u102d\u102f \u1010\u102d\u102f\u1010\u1031\u102c\u1004\u103a\u1038\u101e\u1031\u102c\u1000\u103c\u102c\u1001\u103b\u102d\u1014\u103a\u1019\u103b\u102c\u1038\u1021\u1010\u103d\u1000\u103a \u1001\u103d\u1004\u1037\u103a\u1015\u103c\u102f\u1011\u102c\u1038\u101e\u100a\u1037\u103a time-current \u1006\u1000\u103a\u1006\u1036\u101b\u1031\u1038\u1000\u102d\u102f \u101c\u102d\u102f\u1000\u103a\u1014\u102c\u101e\u100a\u103a-<\/p>\n