{"id":20573,"date":"2025-12-17T08:12:32","date_gmt":"2025-12-17T00:12:32","guid":{"rendered":"https:\/\/viox.com\/?p=20573"},"modified":"2025-12-04T23:48:44","modified_gmt":"2025-12-04T15:48:44","slug":"standard-breaker-sizes","status":"publish","type":"post","link":"https:\/\/test.viox.com\/my\/standard-breaker-sizes\/","title":{"rendered":"Standard Breaker Sizes: MCCB Current Ratings from 16A to 1600A"},"content":{"rendered":"<div class=\"product-intro\">\n<p>Selecting the right<a href=\"https:\/\/test.viox.com\/my\/mccb\/\"> molded case circuit breaker (MCCB)<\/a> starts with understanding standard breaker sizes. Unlike <a href=\"http:\/\/voix.com\/mcb\" rel=\"nofollow noopener\" target=\"_blank\">\u1021\u101e\u1031\u1038\u1005\u102c\u1038 circuit breakers (MCBs)<\/a> that protect final circuits, MCCBs cover a much wider current range\u2014from 16A branch feeders to 1600A main incomers\u2014and choosing the correct rating directly impacts system safety, coordination, and project costs.<\/p>\n<p>This guide maps the complete IEC 60947-2 standard current ratings, explains frame size categories, and shows you how to match breaker specifications to your application. Whether you\u2019re sizing a motor feeder, a building sub-main, or a switchgear incomer, you\u2019ll find the technical details and selection logic you need.<\/p>\n<h2>Quick Reference: Standard MCCB Current Ratings<\/h2>\n<p>IEC-compliant MCCBs are available in these standard ratings:<\/p>\n<p><strong>16A<\/strong> | <strong>20A<\/strong> | <strong>25A<\/strong> | <strong>32A<\/strong> | <strong>40A<\/strong> | <strong>50A<\/strong> | <strong>63A<\/strong> | <strong>80A<\/strong> | <strong>100A<\/strong> | <strong>125A<\/strong> | <strong>160A<\/strong> | <strong>200A<\/strong> | <strong>250A<\/strong> | <strong>320A<\/strong> | <strong>400A<\/strong> | <strong>500A<\/strong> | <strong>630A<\/strong> | <strong>800A<\/strong> | <strong>1000A<\/strong> | <strong>1250A<\/strong> | <strong>1600A<\/strong><\/p>\n<p>Not every manufacturer offers every rating in every frame. The frame size (small, medium, or large) determines which current ratings are available and what breaking capacities (Icu\/Ics) the breaker can achieve.<\/p>\n<figure><img decoding=\"async\" src=\"https:\/\/img.viox.com\/mccb-frame-size-comparison-showing-small-medium-and-large-frame-breakers.webp\" alt=\"MCCB Frame Size Comparison showing small, medium, and large frame breakers\" \/><figcaption>Figure 1: Physical size progression of MCCBs across frame categories. Left to right: Small frame (63A), Medium frame (400A), Large frame (1600A). The frame size determines maximum current rating and breaking capacity available.<\/figcaption><\/figure>\n<h2>Understanding IEC 60947-2 Standard Ratings<\/h2>\n<p>IEC 60947-2 is the international standard that defines performance requirements for low-voltage circuit breakers, including all MCCBs. When you see \u201cIEC 60947-2\u201d marked on a breaker nameplate, it confirms the device has been tested and certified to meet specific electrical, mechanical, and safety criteria.<\/p>\n<h3>Key Rating Parameters<\/h3>\n<p>Every MCCB datasheet includes these essential ratings:<\/p>\n<p><strong>In (Rated Current)<\/strong>: The maximum continuous current the breaker can carry at a reference ambient temperature (typically 40\u00b0C) without tripping. This is the \u201csize\u201d of the breaker\u2014for example, a 250A MCCB has In = 250A.<\/p>\n<p><strong>Ue (Rated Operational Voltage)<\/strong>: The voltage at which the breaker is designed to operate. Common ratings include 230V, 400V, 690V AC for three-phase systems, or 250V DC for battery and solar applications.<\/p>\n<p><strong>Icu (Rated Ultimate Short-Circuit Breaking Capacity)<\/strong>: The maximum fault current (in kA) the breaker can safely interrupt once. After an Icu-level fault, the breaker may not be fit for continued service. Typical values range from 25kA to 100kA depending on frame size.<\/p>\n<p><strong>Ics (Rated Service Short-Circuit Breaking Capacity)<\/strong>: The fault current level at which the breaker can interrupt and remain serviceable for continued operation. IEC defines Ics as a percentage of Icu\u2014usually 25%, 50%, 75%, or 100%. For critical facilities, specify Ics = 100%; for commercial buildings, 75% is standard practice.<\/p>\n<h3>\u1021\u101e\u102f\u1036\u1038\u1001\u103b\u1019\u103e\u102f \u1021\u1019\u103b\u102d\u102f\u1038\u1021\u1005\u102c\u1038\u1019\u103b\u102c\u1038<\/h3>\n<p>IEC 60947-2 defines two categories:<\/p>\n<ul>\n<li><strong>\u1021\u1019\u103b\u102d\u102f\u1038\u1021\u1005\u102c\u1038 A<\/strong>: Breakers designed for instantaneous tripping with no intentional time delay. Most MCCBs fall into this category for general distribution and motor protection.<\/li>\n<li><strong>\u1021\u1019\u103b\u102d\u102f\u1038\u1021\u1005\u102c\u1038 B<\/strong>: Breakers with intentional time delay (withstand capability) for selective coordination with downstream devices. Used in upstream positions where you need selectivity.<\/li>\n<\/ul>\n<h3>Why These Ratings Matter<\/h3>\n<p>When sizing an MCCB, you must ensure:<\/p>\n<ul>\n<li>In matches or exceeds load current (with margin for inrush and future growth)<\/li>\n<li>Icu meets or exceeds prospective fault current at the installation point<\/li>\n<li>Ics is appropriate for the application criticality (75-100%)<\/li>\n<li>Frame size accommodates the required In and Icu combination<\/li>\n<\/ul>\n<p>A 250A load does not automatically require a 250A breaker\u2014you also need to verify the fault level, coordination requirements, and whether derating applies (high ambient temperature, grouping, or harmonic content).<\/p>\n<h2>MCCB Frame Size Categories<\/h2>\n<h3>Frame Size Classification<\/h3>\n<p>While manufacturers use different naming conventions, the industry recognizes three broad categories:<\/p>\n<table>\n<tbody>\n<tr>\n<td><strong>Frame Category<\/strong><\/td>\n<td><strong>\u1015\u102f\u1036\u1019\u103e\u1014\u103a Current \u1021\u1000\u103d\u102c\u1021\u101d\u1031\u1038<\/strong><\/td>\n<td><strong>Typical Icu Range<\/strong><\/td>\n<td><strong>\u1021\u101e\u102f\u1036\u1038\u1019\u103b\u102c\u1038\u101e\u1031\u102c Applications \u1019\u103b\u102c\u1038<\/strong><\/td>\n<\/tr>\n<tr>\n<td><strong>Small Frame<\/strong><\/td>\n<td>16A \u2013 250A<\/td>\n<td>25kA \u2013 50kA<\/td>\n<td>Branch circuits, small feeders, motor protection<\/td>\n<\/tr>\n<tr>\n<td><strong>Medium Frame<\/strong><\/td>\n<td>250A \u2013 630A<\/td>\n<td>35kA \u2013 70kA<\/td>\n<td>Sub-mains, building feeders, distribution boards<\/td>\n<\/tr>\n<tr>\n<td><strong>Large Frame<\/strong><\/td>\n<td>630A \u2013 1600A<\/td>\n<td>50kA \u2013 100kA<\/td>\n<td>Main incomers, switchgear, industrial mains<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<h3>Why Frame Size Matters<\/h3>\n<p><strong>Breaking Capacity Limits<\/strong>: Larger frames can interrupt higher fault currents. If your installation point has 65kA prospective fault current, you\u2019ll need a medium or large frame\u2014small frames typically max out at 50kA.<\/p>\n<p><strong>Physical Space<\/strong>: A 1600A large-frame MCCB can be 300mm wide or more, while a 63A small-frame breaker might be 70mm. Panel design must account for these dimensions, especially in retrofit projects.<\/p>\n<p><strong>\u1000\u102f\u1014\u103a\u1000\u103b\u1005\u101b\u102d\u1010\u103a\u1000\u102d\u102f \u1015\u102d\u102f\u1019\u102d\u102f\u1000\u1031\u102c\u1004\u103a\u1038\u1019\u103d\u1014\u103a\u1021\u1031\u102c\u1004\u103a\u1015\u103c\u102f\u101c\u102f\u1015\u103a\u1001\u103c\u1004\u103a\u1038\u104b<\/strong>: Don\u2019t over-specify. A 200A application with 30kA fault level doesn\u2019t need a large-frame breaker. Use a small-frame 250A unit to save panel space and cost.<\/p>\n<p><strong>Adjustment Range<\/strong>: Electronic trip units in larger frames often allow field adjustment of In, Ir (thermal), and Im (magnetic) settings. Small frames with thermal-magnetic trips are typically fixed.<\/p>\n<h3>Frame vs. Rating: A Practical Example<\/h3>\n<p>Consider a 400A feeder in a commercial building with 40kA fault level:<\/p>\n<ul>\n<li><strong>Option 1<\/strong>: Select a medium-frame MCCB rated 400A \/ 50kA (In=400A, Icu=50kA)<\/li>\n<li><strong>Option 2<\/strong>: Select a large-frame MCCB rated 400A \/ 65kA (In=400A, Icu=65kA)<\/li>\n<\/ul>\n<p>Both meet the 400A load requirement, but Option 1 uses a smaller, less expensive frame adequate for the 40kA fault level. Option 2 provides margin but wastes panel space and budget. The key is to <strong>choose the smallest frame<\/strong> \u101e\u1004\u103a\u104f In \u1014\u103e\u1004\u1037\u103a Icu \u101c\u102d\u102f\u1021\u1015\u103a\u1001\u103b\u1000\u103a\u1014\u103e\u1005\u103a\u1001\u102f\u101c\u102f\u1036\u1038\u1000\u102d\u102f \u1016\u103c\u100a\u1037\u103a\u1006\u100a\u103a\u1038\u1015\u1031\u1038\u1014\u102d\u102f\u1004\u103a\u1015\u102b\u101e\u100a\u103a\u104b.<\/p>\n<figure><img decoding=\"async\" src=\"https:\/\/img.viox.com\/standard-mccb-current-ratings-chart-organized-by-frame-size.webp\" alt=\"Standard MCCB Current Ratings Chart organized by frame size\" \/><figcaption>\u1015\u102f\u1036 \u1042- IEC 60947-2 \u1005\u1036\u1014\u103e\u102f\u1014\u103a\u1038\u1014\u103e\u1004\u1037\u103a\u1021\u100a\u102e \u101c\u1000\u103a\u101b\u103e\u102d\u1021\u1006\u1004\u1037\u103a\u101e\u1010\u103a\u1019\u103e\u1010\u103a\u1001\u103b\u1000\u103a\u1019\u103b\u102c\u1038\u1000\u102d\u102f frame \u1021\u1019\u103b\u102d\u102f\u1038\u1021\u1005\u102c\u1038\u1021\u101c\u102d\u102f\u1000\u103a \u1005\u102e\u1005\u1009\u103a\u1011\u102c\u1038\u101e\u100a\u103a\u104b \u101e\u1031\u1038\u1004\u101a\u103a\u101e\u1031\u102c frame \u1019\u103b\u102c\u1038 (16-250A) \u101e\u100a\u103a branch circuit \u1014\u103e\u1004\u1037\u103a motor protection \u1000\u102d\u102f \u1000\u102d\u102f\u1004\u103a\u1010\u103d\u101a\u103a\u101e\u100a\u103a\u104b \u1021\u101c\u1010\u103a\u1005\u102c\u1038 frame \u1019\u103b\u102c\u1038 (250-630A) \u101e\u100a\u103a building feeder \u1014\u103e\u1004\u1037\u103a sub-main \u1019\u103b\u102c\u1038\u1021\u1010\u103d\u1000\u103a \u1021\u101e\u102f\u1036\u1038\u1015\u103c\u102f\u101e\u100a\u103a\u104b \u1000\u103c\u102e\u1038\u1019\u102c\u1038\u101e\u1031\u102c frame \u1019\u103b\u102c\u1038 (630-1600A) \u101e\u100a\u103a main incomer \u1014\u103e\u1004\u1037\u103a switchgear \u1000\u102d\u102f \u1000\u102c\u1000\u103d\u101a\u103a\u1015\u1031\u1038\u101e\u100a\u103a\u104b.<\/figcaption><\/figure>\n<h2>\u101e\u1031\u1038\u1004\u101a\u103a\u101e\u1031\u102c Frame MCCB \u1019\u103b\u102c\u1038 (16A \u2013 250A)<\/h2>\n<p>\u101e\u1031\u1038\u1004\u101a\u103a\u101e\u1031\u102c frame MCCB \u1019\u103b\u102c\u1038\u101e\u100a\u103a \u1005\u102e\u1038\u1015\u103d\u102c\u1038\u1016\u103c\u1005\u103a\u1014\u103e\u1004\u1037\u103a \u1021\u101c\u1004\u103a\u1038\u1005\u1000\u103a\u1019\u103e\u102f\u101c\u102f\u1015\u103a\u1004\u1014\u103a\u1038\u1019\u103b\u102c\u1038\u1010\u103d\u1004\u103a branch circuit, sub-feeder \u1014\u103e\u1004\u1037\u103a motor protection application \u1021\u1019\u103b\u102c\u1038\u1005\u102f\u1000\u102d\u102f \u1000\u102d\u102f\u1004\u103a\u1010\u103d\u101a\u103a\u101e\u100a\u103a\u104b \u104e\u1004\u103a\u1038\u1010\u102d\u102f\u1037\u101e\u100a\u103a MCB (125A \u1021\u1011\u102d) \u1014\u103e\u1004\u1037\u103a \u1000\u103c\u102e\u1038\u1019\u102c\u1038\u101e\u1031\u102c distribution breaker \u1019\u103b\u102c\u1038\u1000\u103c\u102c\u1038 \u1000\u103d\u102c\u101f\u1001\u103b\u1000\u103a\u1000\u102d\u102f \u1015\u1031\u102b\u1004\u103a\u1038\u1000\u1030\u1038\u1015\u1031\u1038\u101e\u100a\u103a\u104b.<\/p>\n<h3>\u1005\u1036\u1014\u103e\u102f\u1014\u103a\u1038\u101e\u1010\u103a\u1019\u103e\u1010\u103a\u1011\u102c\u1038\u101e\u1031\u102c \u101c\u1000\u103a\u101b\u103e\u102d\u1021\u1006\u1004\u1037\u103a\u1019\u103b\u102c\u1038<\/h3>\n<table>\n<tbody>\n<tr>\n<td><strong>\u1021\u1006\u1004\u1037\u103a\u101e\u1010\u103a\u1019\u103e\u1010\u103a\u1001\u103b\u1000\u103a (A)<\/strong><\/td>\n<td><strong>\u1015\u1036\u102f\u1019\u103d\u1014\u1039\u1021\u101e\u1036\u102f\u1038\u1001\u103a\u103b\u1001\u1004\u1039\u1038<\/strong><\/td>\n<td><strong>\u1021\u101e\u102f\u1036\u1038\u1019\u103b\u102c\u1038\u101e\u1031\u102c Trip \u1021\u1019\u103b\u102d\u102f\u1038\u1021\u1005\u102c\u1038<\/strong><\/td>\n<\/tr>\n<tr>\n<td><strong>16A<\/strong><\/td>\n<td>\u101e\u1031\u1038\u1004\u101a\u103a\u101e\u1031\u102c motor feeder \u1019\u103b\u102c\u1038\u104a lighting panel \u1019\u103b\u102c\u1038<\/td>\n<td>Thermal-Magnetic<\/td>\n<\/tr>\n<tr>\n<td><strong>20A<\/strong><\/td>\n<td>Equipment circuit \u1019\u103b\u102c\u1038\u104a \u101e\u1031\u1038\u1004\u101a\u103a\u101e\u1031\u102c pump \u1019\u103b\u102c\u1038<\/td>\n<td>Thermal-Magnetic<\/td>\n<\/tr>\n<tr>\n<td><strong>25A<\/strong><\/td>\n<td>HVAC unit \u1019\u103b\u102c\u1038\u104a \u101e\u1031\u1038\u1004\u101a\u103a\u101e\u1031\u102c \u1005\u1000\u103a\u1015\u1005\u1039\u1005\u100a\u103a\u1038\u1019\u103b\u102c\u1038<\/td>\n<td>Thermal-Magnetic<\/td>\n<\/tr>\n<tr>\n<td><strong>32A<\/strong><\/td>\n<td>Motor feeder \u1019\u103b\u102c\u1038 (400V \u1010\u103d\u1004\u103a 15kW \u1021\u1011\u102d)<\/td>\n<td>Thermal-Magnetic<\/td>\n<\/tr>\n<tr>\n<td><strong>40A<\/strong><\/td>\n<td>\u1005\u102e\u1038\u1015\u103d\u102c\u1038\u1016\u103c\u1005\u103a \u1019\u102e\u1038\u1016\u102d\u102f\u1001\u103b\u1031\u102c\u1004\u103a\u101e\u102f\u1036\u1038\u1015\u1005\u1039\u1005\u100a\u103a\u1038\u1019\u103b\u102c\u1038\u104a chillers<\/td>\n<td>Thermal-Magnetic<\/td>\n<\/tr>\n<tr>\n<td><strong>50A<\/strong><\/td>\n<td>\u1021\u101c\u1010\u103a\u1005\u102c\u1038 motor \u1019\u103b\u102c\u1038 (22kW)\u104a UPS feeder \u1019\u103b\u102c\u1038<\/td>\n<td>Thermal-Magnetic<\/td>\n<\/tr>\n<tr>\n<td><strong>63A<\/strong><\/td>\n<td>Distribution sub-feeder \u1019\u103b\u102c\u1038\u104a \u1000\u103c\u102e\u1038\u1019\u102c\u1038\u101e\u1031\u102c motor \u1019\u103b\u102c\u1038 (30kW)<\/td>\n<td>Thermal-Magnetic \/ Electronic<\/td>\n<\/tr>\n<tr>\n<td><strong>80A<\/strong><\/td>\n<td>Building sub-distribution\u104a motor control center \u1019\u103b\u102c\u1038<\/td>\n<td>Thermal-Magnetic \/ Electronic<\/td>\n<\/tr>\n<tr>\n<td><strong>100A<\/strong><\/td>\n<td>Floor distribution board \u1019\u103b\u102c\u1038\u104a lift circuit \u1019\u103b\u102c\u1038<\/td>\n<td>Thermal-Magnetic \/ Electronic<\/td>\n<\/tr>\n<tr>\n<td><strong>125A<\/strong><\/td>\n<td>Building riser \u1019\u103b\u102c\u1038\u104a \u101e\u1031\u1038\u1004\u101a\u103a\u101e\u1031\u102c \u1005\u102e\u1038\u1015\u103d\u102c\u1038\u1016\u103c\u1005\u103a service entrance<\/td>\n<td>Electronic<\/td>\n<\/tr>\n<tr>\n<td><strong>160A<\/strong><\/td>\n<td>Sub-main \u1019\u103b\u102c\u1038\u104a generator transfer switch \u1019\u103b\u102c\u1038<\/td>\n<td>Electronic<\/td>\n<\/tr>\n<tr>\n<td><strong>200A<\/strong><\/td>\n<td>\u1005\u102e\u1038\u1015\u103d\u102c\u1038\u1016\u103c\u1005\u103a sub-main \u1019\u103b\u102c\u1038\u104a \u101e\u1031\u1038\u1004\u101a\u103a\u101e\u1031\u102c \u1005\u1000\u103a\u1019\u103e\u102f feeder \u1019\u103b\u102c\u1038<\/td>\n<td>Electronic<\/td>\n<\/tr>\n<tr>\n<td><strong>250A<\/strong><\/td>\n<td>Building main feeder \u1019\u103b\u102c\u1038\u104a \u1005\u1000\u103a\u1019\u103e\u102f distribution<\/td>\n<td>Electronic<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<h3>\u1014\u100a\u103a\u1038\u1015\u100a\u102c\u1006\u102d\u102f\u1004\u103a\u101b\u102c \u101c\u1000\u1039\u1001\u100f\u102c\u1019\u103b\u102c\u1038<\/h3>\n<p><strong>\u1031\u1006\u1038\u1031\u107e<\/strong>: \u101e\u1031\u1038\u1004\u101a\u103a\u101e\u1031\u102c frame MCCB \u1019\u103b\u102c\u1038\u101e\u100a\u103a \u1019\u103b\u102c\u1038\u101e\u1031\u102c\u1021\u102c\u1038\u1016\u103c\u1004\u1037\u103a 25kA \u1019\u103e 50kA \u1021\u1011\u102d Icu \u1021\u1006\u1004\u1037\u103a\u101e\u1010\u103a\u1019\u103e\u1010\u103a\u1001\u103b\u1000\u103a\u1019\u103b\u102c\u1038\u1000\u102d\u102f \u1015\u1031\u1038\u1006\u1031\u102c\u1004\u103a\u101e\u100a\u103a\u104b \u1005\u102e\u1038\u1015\u103d\u102c\u1038\u1016\u103c\u1005\u103a\u1021\u1006\u1031\u102c\u1000\u103a\u1021\u1021\u102f\u1036\u1021\u1019\u103b\u102c\u1038\u1005\u102f (fault level 20-35kA) \u1021\u1010\u103d\u1000\u103a 36kA \u101e\u102d\u102f\u1037\u1019\u101f\u102f\u1010\u103a 50kA frame \u101e\u100a\u103a \u101c\u102f\u1036\u101c\u1031\u102c\u1000\u103a\u101e\u1031\u102c \u1000\u102c\u1000\u103d\u101a\u103a\u1019\u103e\u102f\u1000\u102d\u102f \u1015\u1031\u1038\u1015\u102b\u101e\u100a\u103a\u104b.<\/p>\n<p><strong>Trip \u1014\u100a\u103a\u1038\u1015\u100a\u102c<\/strong>:<\/p>\n<ul>\n<li><strong>16A-63A<\/strong>: \u1019\u103b\u102c\u1038\u101e\u1031\u102c\u1021\u102c\u1038\u1016\u103c\u1004\u1037\u103a fixed thermal-magnetic (bimetallic + electromagnetic trip)<\/li>\n<li><strong>63A-250A<\/strong>: fixed thermal-magnetic \u1014\u103e\u1004\u1037\u103a adjustable electronic version \u1014\u103e\u1005\u103a\u1019\u103b\u102d\u102f\u1038\u101c\u102f\u1036\u1038\u1010\u103d\u1004\u103a \u101b\u101b\u103e\u102d\u1014\u102d\u102f\u1004\u103a\u1015\u102b\u101e\u100a\u103a\u104b<\/li>\n<li>Electronic trip unit \u1019\u103b\u102c\u1038\u101e\u100a\u103a motor coordination \u1021\u1010\u103d\u1000\u103a \u1021\u101e\u102f\u1036\u1038\u101d\u1004\u103a\u101e\u1031\u102c adjustable Ir (overload) \u1014\u103e\u1004\u1037\u103a Im (short-circuit) setting \u1019\u103b\u102c\u1038\u1000\u102d\u102f \u1015\u1031\u1038\u1006\u1031\u102c\u1004\u103a\u1015\u102b\u101e\u100a\u103a\u104b<\/li>\n<\/ul>\n<p><strong>\u101b\u101b\u103e\u102d\u1014\u102d\u102f\u1004\u103a\u101e\u1031\u102c Pole \u1019\u103b\u102c\u1038<\/strong>: 1P, 2P, 3P, 4P configurations\u104b single-phase circuit \u1019\u103b\u102c\u1038\u1021\u1010\u103d\u1000\u103a 1P MCCB \u1019\u103b\u102c\u1038\u101e\u100a\u103a MCB \u1019\u103b\u102c\u1038\u1011\u1000\u103a \u1014\u100a\u103a\u1038\u1015\u102b\u1038\u1000\u103c\u1031\u102c\u1004\u103a\u1038 \u101e\u1010\u102d\u1015\u103c\u102f\u1015\u102b\u104b \u101e\u1031\u1038\u1004\u101a\u103a\u101e\u1031\u102c frame MCCB \u1021\u1019\u103b\u102c\u1038\u1005\u102f\u101e\u100a\u103a 2P \u101e\u102d\u102f\u1037\u1019\u101f\u102f\u1010\u103a 3P \u1016\u103c\u1004\u1037\u103a \u1005\u1010\u1004\u103a\u1015\u102b\u101e\u100a\u103a\u104b.<\/p>\n<h3>Motor Protection \u1025\u1015\u1019\u102c<\/h3>\n<p>30kW \/ 400V \u101e\u102f\u1036\u1038\u1006\u1004\u1037\u103a motor (In \u2248 57A full-load) \u1021\u1010\u103d\u1000\u103a-<\/p>\n<ol>\n<li><strong>Breaker \u1021\u1006\u1004\u1037\u103a\u101e\u1010\u103a\u1019\u103e\u1010\u103a\u1001\u103b\u1000\u103a\u1000\u102d\u102f \u101b\u103d\u1031\u1038\u1001\u103b\u101a\u103a\u1015\u102b<\/strong>: 63A MCCB \u1000\u102d\u102f \u101b\u103d\u1031\u1038\u1001\u103b\u101a\u103a\u1015\u102b (57A \u1021\u1011\u1000\u103a \u1014\u1031\u102c\u1000\u103a\u1011\u1015\u103a\u1005\u1036\u1021\u101b\u103d\u101a\u103a\u1021\u1005\u102c\u1038)<\/li>\n<li><strong>Breaking capacity \u1000\u102d\u102f \u1005\u1005\u103a\u1006\u1031\u1038\u1015\u102b<\/strong>: fault level \u101e\u100a\u103a 28kA \u1016\u103c\u1005\u103a\u1015\u102b\u1000 36kA \u101e\u102d\u102f\u1037\u1019\u101f\u102f\u1010\u103a 50kA Icu \u1000\u102d\u102f \u101e\u1010\u103a\u1019\u103e\u1010\u103a\u1015\u102b\u104b<\/li>\n<li><strong>Trip setting<\/strong>: 0.95 x In (54A thermal protection) \u1010\u103d\u1004\u103a Ir set \u1011\u102c\u1038\u101e\u1031\u102c adjustable Ir \u1015\u102b\u101b\u103e\u102d\u101e\u1031\u102c electronic trip \u1000\u102d\u102f \u1021\u101e\u102f\u1036\u1038\u1015\u103c\u102f\u1015\u102b\u104b<\/li>\n<li><strong>\u100a\u103e\u102d\u1014\u103e\u102d\u102f\u1004\u103a\u1038\u1006\u1031\u102c\u1004\u103a\u101b\u103d\u1000\u103a\u1001\u103c\u1004\u103a\u1038<\/strong>: magnetic threshold Im \u101e\u100a\u103a motor starting current \u1011\u1000\u103a\u1000\u103c\u102e\u1038\u1000\u103c\u1031\u102c\u1004\u103a\u1038 \u101e\u1031\u1001\u103b\u102c\u1015\u102b\u1005\u1031 (\u1015\u102f\u1036\u1019\u103e\u1014\u103a\u1021\u102c\u1038\u1016\u103c\u1004\u1037\u103a 6-8 x In)<\/li>\n<\/ol>\n<h3>\u101e\u1031\u1038\u1004\u101a\u103a\u101e\u1031\u102c Frame \u1000\u102d\u102f \u1018\u101a\u103a\u1021\u1001\u103b\u102d\u1014\u103a\u1019\u103e\u102c \u101b\u103d\u1031\u1038\u1001\u103b\u101a\u103a\u1019\u101c\u1032<\/h3>\n<ul>\n<li><strong>\u101c\u1000\u103a\u101b\u103e\u102d\u1000\u102d\u102f \u1006\u103d\u1032\u1001\u103b\u1015\u102b\u104b<\/strong> \u2264 250A<\/li>\n<li><strong>Fault level<\/strong> \u2264 50kA<\/li>\n<li><strong>\u101c\u103b\u103e\u1031\u102c\u1000\u103a\u101c\u103d\u103e\u102c<\/strong> motor \u1019\u103b\u102c\u1038\u104a \u1005\u1000\u103a\u1015\u1005\u1039\u1005\u100a\u103a\u1038\u1019\u103b\u102c\u1038 \u101e\u102d\u102f\u1037\u1019\u101f\u102f\u1010\u103a building sub-distribution \u1015\u102b\u101d\u1004\u103a\u101e\u100a\u103a\u104b<\/li>\n<li><strong>\u1014\u1031\u101b\u102c<\/strong> \u1000\u1014\u1037\u103a\u101e\u1010\u103a\u1011\u102c\u1038\u101e\u100a\u103a (\u1015\u102f\u1036\u1019\u103e\u1014\u103a\u1021\u102c\u1038\u1016\u103c\u1004\u1037\u103a pole \u1019\u103b\u102c\u1038\u1015\u1031\u102b\u103a\u1019\u1030\u1010\u100a\u103a\u104d \u1021\u1000\u103b\u101a\u103a 70-140mm)<\/li>\n<\/ul>\n<p>\u101b\u102d\u102f\u1038\u101b\u103e\u1004\u103a\u1038\u101e\u1031\u102c resistive load \u1019\u103b\u102c\u1038\u1000\u102d\u102f \u1000\u102c\u1000\u103d\u101a\u103a\u1015\u1031\u1038\u101e\u1031\u102c \u1021\u1014\u102d\u1019\u1037\u103a\u1015\u102d\u102f\u1004\u103a\u1038\u1021\u1006\u1004\u1037\u103a\u101e\u1010\u103a\u1019\u103e\u1010\u103a\u1001\u103b\u1000\u103a\u1019\u103b\u102c\u1038 (16-32A) \u1021\u1010\u103d\u1000\u103a MCB \u101e\u100a\u103a \u1015\u102d\u102f\u1019\u102d\u102f\u1000\u102f\u1014\u103a\u1000\u103b\u1005\u101b\u102d\u1010\u103a\u101e\u1000\u103a\u101e\u102c\u1014\u102d\u102f\u1004\u103a\u101e\u100a\u103a\u104b adjustable trip setting \u1019\u103b\u102c\u1038\u104a \u1019\u103c\u1004\u1037\u103a\u1019\u102c\u1038\u101e\u1031\u102c breaking capacity \u101e\u102d\u102f\u1037\u1019\u101f\u102f\u1010\u103a \u1015\u102d\u102f\u1019\u102d\u102f\u1000\u1031\u102c\u1004\u103a\u1038\u1019\u103d\u1014\u103a\u101e\u1031\u102c selectivity coordination \u101c\u102d\u102f\u1021\u1015\u103a\u101e\u100a\u1037\u103a\u1021\u1001\u102b MCCB \u1000\u102d\u102f \u101b\u103d\u1031\u1038\u1001\u103b\u101a\u103a\u1015\u102b\u104b.<\/p>\n<h2>\u1021\u101c\u1010\u103a\u1005\u102c\u1038 Frame MCCB \u1019\u103b\u102c\u1038 (250A \u2013 630A)<\/h2>\n<p>\u1021\u101c\u1010\u103a\u1005\u102c\u1038 frame MCCB \u1019\u103b\u102c\u1038\u101e\u100a\u103a \u1005\u102e\u1038\u1015\u103d\u102c\u1038\u1016\u103c\u1005\u103a\u1014\u103e\u1004\u1037\u103a \u1005\u1000\u103a\u1019\u103e\u102f\u101c\u102f\u1015\u103a\u1004\u1014\u103a\u1038 distribution system \u1019\u103b\u102c\u1038\u104f \u1021\u1013\u102d\u1000\u1000\u103b\u1031\u102c\u101b\u102d\u102f\u1038\u1021\u1016\u103c\u1005\u103a \u1006\u1031\u102c\u1004\u103a\u101b\u103d\u1000\u103a\u101e\u100a\u103a\u104b \u104e\u1004\u103a\u1038\u1010\u102d\u102f\u1037\u101e\u100a\u103a building feeder \u1019\u103b\u102c\u1038\u104a sub-main \u1019\u103b\u102c\u1038 \u1014\u103e\u1004\u1037\u103a medium-voltage transformer secondary \u1019\u103b\u102c\u1038\u1000\u102d\u102f \u1000\u102c\u1000\u103d\u101a\u103a\u1015\u1031\u1038\u101e\u100a\u103a\u104b \u1024\u1021\u1000\u103d\u102c\u1021\u101d\u1031\u1038\u101e\u100a\u103a \u101b\u102f\u1036\u1038\u1021\u1006\u1031\u102c\u1000\u103a\u1021\u1021\u102f\u1036\u1019\u103b\u102c\u1038\u104a \u1005\u103b\u1031\u1038\u101d\u101a\u103a\u1005\u1004\u103a\u1010\u102c\u1019\u103b\u102c\u1038\u1014\u103e\u1004\u1037\u103a \u1011\u102f\u1010\u103a\u101c\u102f\u1015\u103a\u101b\u1031\u1038\u1005\u1000\u103a\u101b\u102f\u1036\u1019\u103b\u102c\u1038\u101b\u103e\u102d main distribution board application \u1021\u1019\u103b\u102c\u1038\u1005\u102f\u1000\u102d\u102f \u101c\u103d\u103e\u1019\u103a\u1038\u1001\u103c\u102f\u1036\u1011\u102c\u1038\u101e\u100a\u103a\u104b.<\/p>\n<h3>\u1005\u1036\u1014\u103e\u102f\u1014\u103a\u1038\u101e\u1010\u103a\u1019\u103e\u1010\u103a\u1011\u102c\u1038\u101e\u1031\u102c \u101c\u1000\u103a\u101b\u103e\u102d\u1021\u1006\u1004\u1037\u103a\u1019\u103b\u102c\u1038<\/h3>\n<table>\n<tbody>\n<tr>\n<td><strong>\u1021\u1006\u1004\u1037\u103a\u101e\u1010\u103a\u1019\u103e\u1010\u103a\u1001\u103b\u1000\u103a (A)<\/strong><\/td>\n<td><strong>\u1015\u1036\u102f\u1019\u103d\u1014\u1039\u1021\u101e\u1036\u102f\u1038\u1001\u103a\u103b\u1001\u1004\u1039\u1038<\/strong><\/td>\n<td><strong>Typical Icu Range<\/strong><\/td>\n<\/tr>\n<tr>\n<td><strong>250A<\/strong><\/td>\n<td>Building main feeder \u1019\u103b\u102c\u1038\u104a \u1005\u1000\u103a\u1019\u103e\u102f sub-distribution<\/td>\n<td>35kA \u2013 65kA<\/td>\n<\/tr>\n<tr>\n<td><strong>320A<\/strong><\/td>\n<td>\u1005\u102e\u1038\u1015\u103d\u102c\u1038\u1016\u103c\u1005\u103a main feeder \u1019\u103b\u102c\u1038\u104a \u1021\u101c\u1010\u103a\u1005\u102c\u1038 \u1005\u1000\u103a\u1019\u103e\u102f load \u1019\u103b\u102c\u1038<\/td>\n<td>35kA \u2013 65kA<\/td>\n<\/tr>\n<tr>\n<td><strong>400A<\/strong><\/td>\n<td>Building service entrance (\u101e\u1031\u1038\u1004\u101a\u103a-\u1021\u101c\u1010\u103a\u1005\u102c\u1038)\u104a process equipment<\/td>\n<td>35kA \u2013 70kA<\/td>\n<\/tr>\n<tr>\n<td><strong>500A<\/strong><\/td>\n<td>\u1000\u103c\u102e\u1038\u1019\u102c\u1038\u101e\u1031\u102c building feeder \u1019\u103b\u102c\u1038\u104a \u1005\u1000\u103a\u1019\u103e\u102f main \u1019\u103b\u102c\u1038<\/td>\n<td>50kA \u2013 70kA<\/td>\n<\/tr>\n<tr>\n<td><strong>630A<\/strong><\/td>\n<td>Main distribution board \u1019\u103b\u102c\u1038\u104a transformer secondary protection<\/td>\n<td>50kA \u2013 85kA<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<h3>\u1014\u100a\u103a\u1038\u1015\u100a\u102c\u1006\u102d\u102f\u1004\u103a\u101b\u102c \u101c\u1000\u1039\u1001\u100f\u102c\u1019\u103b\u102c\u1038<\/h3>\n<p><strong>\u1031\u1006\u1038\u1031\u107e<\/strong>: \u1021\u101c\u1010\u103a\u1005\u102c\u1038 frame \u1019\u103b\u102c\u1038\u101e\u100a\u103a main distribution point \u1019\u103b\u102c\u1038\u1010\u103d\u1004\u103a \u1015\u102f\u1036\u1019\u103e\u1014\u103a\u1016\u103c\u1005\u103a\u101e\u1031\u102c \u1019\u103c\u1004\u1037\u103a\u1019\u102c\u1038\u101e\u1031\u102c fault current \u1019\u103b\u102c\u1038\u1000\u102d\u102f \u1000\u102d\u102f\u1004\u103a\u1010\u103d\u101a\u103a\u101b\u1014\u103a\u1021\u1010\u103d\u1000\u103a \u1019\u103c\u1004\u1037\u103a\u1019\u102c\u1038\u101e\u1031\u102c Icu \u1021\u1006\u1004\u1037\u103a\u101e\u1010\u103a\u1019\u103e\u1010\u103a\u1001\u103b\u1000\u103a\u1019\u103b\u102c\u1038 (35-85kA) \u1000\u102d\u102f \u1015\u1031\u1038\u1006\u1031\u102c\u1004\u103a\u1015\u102b\u101e\u100a\u103a\u104b on-site generation \u101e\u102d\u102f\u1037\u1019\u101f\u102f\u1010\u103a close transformer coupling \u1015\u102b\u101b\u103e\u102d\u101e\u1031\u102c \u1005\u1000\u103a\u1019\u103e\u102f\u101c\u102f\u1015\u103a\u1004\u1014\u103a\u1038\u1006\u102d\u102f\u1012\u103a\u1019\u103b\u102c\u1038\u101e\u100a\u103a 40-65kA \u1021\u1000\u103d\u102c\u1021\u101d\u1031\u1038\u1010\u103d\u1004\u103a fault level \u1019\u103b\u102c\u1038\u1000\u102d\u102f \u1019\u1000\u103c\u102c\u1001\u100f \u1010\u103d\u1031\u1037\u101b\u101e\u100a\u103a\u104b.<\/p>\n<p><strong>\u101c\u1000\u103a\u1011\u101b\u1031\u102c\u1014\u1005\u103a\u1001\u101b\u102e\u1038\u101a\u1030\u1014\u1005\u103a<\/strong>: \u1021\u101c\u1010\u103a\u1005\u102c\u1038 frame MCCB \u1021\u102c\u1038\u101c\u102f\u1036\u1038\u1014\u102e\u1038\u1015\u102b\u1038\u101e\u100a\u103a electronic trip \u1014\u100a\u103a\u1038\u1015\u100a\u102c\u1000\u102d\u102f \u1021\u101e\u102f\u1036\u1038\u1015\u103c\u102f\u101e\u100a\u103a-<\/p>\n<ul>\n<li><strong>Ir (Overload)<\/strong>: 0.4 \u1019\u103e 1.0 x In \u1021\u1011\u102d \u1001\u103b\u102d\u1014\u103a\u100a\u103e\u102d\u1014\u102d\u102f\u1004\u103a\u101e\u100a\u103a\u104a time-delayed thermal protection<\/li>\n<li><strong>Isd (Short-Delay)<\/strong>: \u1001\u103b\u102d\u1014\u103a\u100a\u103e\u102d\u1014\u102d\u102f\u1004\u103a\u101e\u1031\u102c \u1001\u103b\u1000\u103a\u1001\u103b\u1004\u103a\u1038 \u101c\u103b\u103e\u1015\u103a\u1005\u102e\u1038\u1000\u103c\u1031\u102c\u1004\u103a\u1038\u1015\u102d\u102f\u101c\u103b\u103e\u1036\u1019\u103e\u102f \u1000\u1014\u1037\u103a\u101e\u1010\u103a\u1001\u103b\u1000\u103a\u104a \u1015\u102f\u1036\u1019\u103e\u1014\u103a\u1021\u102c\u1038\u1016\u103c\u1004\u1037\u103a 1.5-10 x In<\/li>\n<li><strong>Ii (\u1001\u103b\u1000\u103a\u1001\u103b\u1004\u103a\u1038)<\/strong>: \u1019\u103c\u1004\u1037\u103a\u1019\u102c\u1038\u101e\u1031\u102c \u1001\u103b\u102d\u102f\u1037\u101a\u103d\u1004\u103a\u1038\u1019\u103e\u102f\u1019\u103b\u102c\u1038\u1021\u1010\u103d\u1000\u103a \u101e\u1036\u101c\u102d\u102f\u1000\u103a\u1013\u102c\u1010\u103a\u1021\u102c\u1038\u1016\u103c\u1010\u103a\u1010\u1031\u102c\u1000\u103a\u1001\u103c\u1004\u103a\u1038 (\u1021\u1001\u103b\u102d\u102f\u1037\u101a\u1030\u1014\u1005\u103a\u1019\u103b\u102c\u1038\u1010\u103d\u1004\u103a \u101b\u103d\u1031\u1038\u1001\u103b\u101a\u103a\u1014\u102d\u102f\u1004\u103a\u101e\u100a\u103a)<\/li>\n<li><strong>\u1019\u103c\u1031\u1015\u103c\u1004\u103a\u1015\u103c\u1010\u103a\u101b\u103d\u1031\u1037<\/strong>: \u1015\u102d\u102f\u1019\u102d\u102f\u1000\u1031\u102c\u1004\u103a\u1038\u1019\u103d\u1014\u103a\u101e\u1031\u102c \u1018\u1031\u1038\u1000\u1004\u103a\u1038\u101c\u102f\u1036\u1001\u103c\u102f\u1036\u1019\u103e\u102f\u1021\u1010\u103d\u1000\u103a \u1019\u103c\u1031\u1015\u103c\u1004\u103a\u1001\u103b\u102d\u102f\u1037\u101a\u103d\u1004\u103a\u1038\u1019\u103e\u102f \u1000\u102c\u1000\u103d\u101a\u103a\u101b\u1031\u1038 module (\u101b\u103d\u1031\u1038\u1001\u103b\u101a\u103a\u1014\u102d\u102f\u1004\u103a\u101e\u100a\u103a)<\/li>\n<\/ul>\n<p><strong>\u1018\u1031\u102c\u1004\u103a\u1021\u1000\u103b\u101a\u103a<\/strong>: 3-pole \u101a\u1030\u1014\u1005\u103a\u1019\u103b\u102c\u1038\u1021\u1010\u103d\u1000\u103a 140-180mm \u1021\u1000\u103b\u101a\u103a\u104a 4-pole \u1021\u1010\u103d\u1000\u103a 190-240mm \u1000\u102d\u102f \u1019\u103b\u103e\u1031\u102c\u103a\u101c\u1004\u1037\u103a\u1015\u102b\u104b panel \u1016\u103c\u1010\u103a\u1010\u1031\u102c\u1000\u103a\u1019\u103e\u102f \u1021\u1010\u102d\u102f\u1004\u103a\u1038\u1021\u1010\u102c\u1019\u103b\u102c\u1038\u1000\u102d\u102f \u1002\u101b\u102f\u1010\u1005\u102d\u102f\u1000\u103a \u1005\u102e\u1005\u1009\u103a\u1015\u102b\u2014\u1024 breaker \u1019\u103b\u102c\u1038\u101e\u100a\u103a \u101e\u1031\u1038\u1004\u101a\u103a\u101e\u1031\u102c \u1018\u1031\u102c\u1004\u103a\u1019\u103b\u102c\u1038\u1011\u1000\u103a \u1014\u1031\u101b\u102c\u1015\u102d\u102f\u101a\u1030\u1015\u102b\u101e\u100a\u103a\u104b.<\/p>\n<p><strong>\u1006\u1000\u103a\u101e\u103d\u101a\u103a\u101b\u1031\u1038<\/strong>: \u1021\u101c\u101a\u103a\u1021\u101c\u1010\u103a\u1018\u1031\u102c\u1004\u103a MCCB \u1021\u1019\u103b\u102c\u1038\u1021\u1015\u103c\u102c\u1038\u101e\u100a\u103a \u1021\u1006\u1031\u102c\u1000\u103a\u1021\u1026 \u1005\u102e\u1019\u1036\u1001\u1014\u1037\u103a\u1001\u103d\u1032\u1019\u103e\u102f\u1005\u1014\u1005\u103a\u1019\u103b\u102c\u1038 (BMS) \u101e\u102d\u102f\u1037\u1019\u101f\u102f\u1010\u103a SCADA \u1010\u103d\u1004\u103a \u1015\u1031\u102b\u1004\u103a\u1038\u1005\u100a\u103a\u1038\u101b\u1014\u103a\u1021\u1010\u103d\u1000\u103a \u1006\u1000\u103a\u101e\u103d\u101a\u103a\u101b\u1031\u1038 module \u1019\u103b\u102c\u1038 (Modbus RTU, Profibus, Ethernet) \u1000\u102d\u102f \u1015\u1031\u1038\u1006\u1031\u102c\u1004\u103a\u1015\u102b\u101e\u100a\u103a\u104b.<\/p>\n<h3>\u100a\u103e\u102d\u1014\u103e\u102d\u102f\u1004\u103a\u1038\u1019\u103e\u102f\u1014\u103e\u1004\u1037\u103a \u101b\u103d\u1031\u1038\u1001\u103b\u101a\u103a\u1019\u103e\u102f<\/h3>\n<p>\u1024\u101c\u103b\u103e\u1015\u103a\u1005\u102e\u1038\u1000\u103c\u1031\u102c\u1004\u103a\u1038\u1021\u1006\u1004\u1037\u103a\u1010\u103d\u1004\u103a\u104a, <strong>\u101b\u103d\u1031\u1038\u1001\u103b\u101a\u103a\u100a\u103e\u102d\u1014\u103e\u102d\u102f\u1004\u103a\u1038\u1001\u103c\u1004\u103a\u1038<\/strong> \u1021\u101b\u1031\u1038\u1000\u103c\u102e\u1038\u101c\u102c\u101e\u100a\u103a\u104b upstream 630A \u1014\u103e\u1004\u1037\u103a downstream 250A breaker \u1019\u103b\u102c\u1038\u101e\u100a\u103a \u1000\u1031\u102c\u1004\u103a\u1038\u1019\u103d\u1014\u103a\u1005\u103d\u102c \u1001\u103d\u1032\u1001\u103c\u102c\u1038\u1014\u102d\u102f\u1004\u103a\u1005\u1031\u101b\u1014\u103a\u1021\u1010\u103d\u1000\u103a \u101e\u1004\u103a\u101e\u100a\u103a time-current curve analysis \u101c\u102d\u102f\u1021\u1015\u103a\u1015\u102b\u101e\u100a\u103a\u104b<\/p>\n<ul>\n<li><strong>\u1019\u1010\u1030\u100a\u102e\u101e\u1031\u102c \u1001\u101b\u102e\u1038\u1005\u1009\u103a\u1014\u100a\u103a\u1038\u1015\u100a\u102c\u1019\u103b\u102c\u1038\u1000\u102d\u102f \u1021\u101e\u102f\u1036\u1038\u1015\u103c\u102f\u1015\u102b\u104b<\/strong>: Upstream electronic (\u1001\u103b\u102d\u1014\u103a\u100a\u103e\u102d\u1014\u102d\u102f\u1004\u103a\u101e\u1031\u102c\u1021\u1001\u103b\u102d\u1014\u103a\u1014\u103e\u1031\u102c\u1004\u1037\u103a\u1014\u103e\u1031\u1038) + downstream thermal-magnetic (\u1021\u1019\u103c\u1014\u103a)<\/li>\n<li><strong>Time-current curve \u1019\u103b\u102c\u1038\u1000\u102d\u102f \u1005\u1005\u103a\u1006\u1031\u1038\u1015\u102b\u104b<\/strong>: \u1001\u103b\u102d\u102f\u1037\u101a\u103d\u1004\u103a\u1038\u1019\u103e\u102f\u1021\u1006\u1004\u1037\u103a\u1021\u102c\u1038\u101c\u102f\u1036\u1038\u1010\u103d\u1004\u103a \u1021\u1014\u100a\u103a\u1038\u1006\u102f\u1036\u1038 100-200ms \u1001\u103d\u1032\u1001\u103c\u102c\u1038\u1001\u103b\u102d\u1014\u103a\u101e\u1031\u1001\u103b\u102c\u1015\u102b\u1005\u1031\u104b<\/li>\n<li><strong>S-series \u101e\u102d\u102f\u1037\u1019\u101f\u102f\u1010\u103a ZSI \u1000\u102d\u102f \u1011\u100a\u1037\u103a\u101e\u103d\u1004\u103a\u1038\u1005\u1009\u103a\u1038\u1005\u102c\u1038\u1015\u102b\u104b<\/strong>: \u1011\u102f\u1010\u103a\u101c\u102f\u1015\u103a\u101e\u1030\u1021\u1001\u103b\u102d\u102f\u1037\u101e\u100a\u103a \u1021\u102c\u1019\u1001\u1036\u1011\u102c\u1038\u101e\u1031\u102c \u100a\u103e\u102d\u1014\u103e\u102d\u102f\u1004\u103a\u1038\u1019\u103e\u102f\u1021\u1010\u103d\u1000\u103a \u201cselective\u201d \u101e\u102d\u102f\u1037\u1019\u101f\u102f\u1010\u103a zone-selective interlocking \u1000\u102d\u102f \u1015\u1031\u1038\u1006\u1031\u102c\u1004\u103a\u1015\u102b\u101e\u100a\u103a\u104b<\/li>\n<\/ul>\n<h3>Transformer Secondary Protection \u1025\u1015\u1019\u102c<\/h3>\n<p>1000kVA \/ 400V \u1011\u101b\u1014\u103a\u1005\u1016\u1031\u102c\u103a\u1019\u102c\u1021\u1010\u103d\u1000\u103a (In \u2248 1443A secondary):<\/p>\n<ol>\n<li><strong>\u1001\u103b\u102d\u102f\u1037\u101a\u103d\u1004\u103a\u1038\u1019\u103e\u102f\u1021\u1006\u1004\u1037\u103a\u1000\u102d\u102f \u1010\u103d\u1000\u103a\u1001\u103b\u1000\u103a\u1015\u102b\u104b<\/strong>: \u1011\u101b\u1014\u103a\u1005\u1016\u1031\u102c\u103a\u1019\u102c impedance Zk = 6% \u1016\u103c\u1005\u103a\u1015\u102b\u1000\u104a secondary fault \u2248 24 x In = 34.6kA<\/li>\n<li><strong>Breaker \u1021\u1006\u1004\u1037\u103a\u101e\u1010\u103a\u1019\u103e\u1010\u103a\u1001\u103b\u1000\u103a\u1000\u102d\u102f \u101b\u103d\u1031\u1038\u1001\u103b\u101a\u103a\u1015\u102b<\/strong>: 630A MCCB \u1000\u102d\u102f main breaker \u1021\u1016\u103c\u1005\u103a \u101b\u103d\u1031\u1038\u1001\u103b\u101a\u103a\u1015\u102b (~440kW \u1021\u1011\u102d \u1021\u1014\u102c\u1002\u1010\u103a\u101d\u1014\u103a\u1010\u102d\u102f\u1038\u1019\u103c\u103e\u1004\u1037\u103a\u1019\u103e\u102f\u1021\u1010\u103d\u1000\u103a \u1001\u103d\u1004\u1037\u103a\u1015\u103c\u102f\u101e\u100a\u103a)<\/li>\n<li><strong>Breaking capacity \u1000\u102d\u102f \u101e\u1010\u103a\u1019\u103e\u1010\u103a\u1015\u102b\u104b<\/strong>: Icu \u2265 35kA; margin \u1021\u1010\u103d\u1000\u103a 50kA \u101e\u102d\u102f\u1037\u1019\u101f\u102f\u1010\u103a 65kA \u1018\u1031\u102c\u1004\u103a\u1000\u102d\u102f \u101b\u103d\u1031\u1038\u1001\u103b\u101a\u103a\u1015\u102b\u104b<\/li>\n<li><strong>\u1001\u101b\u102e\u1038\u1005\u1009\u103a\u1006\u1000\u103a\u1010\u1004\u103a\u1019\u103b\u102c\u1038<\/strong>: Ir = 0.8 x 630A = 504A (\u101d\u1014\u103a\u1015\u102d\u102f\u1001\u101b\u102e\u1038\u1005\u1009\u103a\u1019\u1015\u102b\u1018\u1032 1443A feeder \u1000\u102d\u102f \u1001\u103d\u1004\u1037\u103a\u1015\u103c\u102f\u101e\u100a\u103a)<\/li>\n<li><strong>\u100a\u103e\u102d\u1014\u103e\u102d\u102f\u1004\u103a\u1038\u1006\u1031\u102c\u1004\u103a\u101b\u103d\u1000\u103a\u1001\u103c\u1004\u103a\u1038<\/strong>: downstream 250A breaker \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\u1021\u1010\u103d\u1000\u103a Isd = 3000A \u1000\u102d\u102f 0.2s \u1014\u103e\u1031\u102c\u1004\u1037\u103a\u1014\u103e\u1031\u1038\u1019\u103e\u102f\u1016\u103c\u1004\u1037\u103a \u101e\u1010\u103a\u1019\u103e\u1010\u103a\u1015\u102b\u104b<\/li>\n<\/ol>\n<h3>\u1021\u101c\u101a\u103a\u1021\u101c\u1010\u103a\u1018\u1031\u102c\u1004\u103a\u1000\u102d\u102f \u1018\u101a\u103a\u1021\u1001\u103b\u102d\u1014\u103a\u1019\u103e\u102c \u101b\u103d\u1031\u1038\u1001\u103b\u101a\u103a\u1019\u101c\u1032\u104b<\/h3>\n<ul>\n<li><strong>\u101c\u1000\u103a\u101b\u103e\u102d\u1000\u102d\u102f \u1006\u103d\u1032\u1001\u103b\u1015\u102b\u104b<\/strong> 250-630A<\/li>\n<li><strong>Fault level<\/strong> 30-85kA<\/li>\n<li><strong>\u101c\u103b\u103e\u1031\u102c\u1000\u103a\u101c\u103d\u103e\u102c<\/strong> main distribution board \u1019\u103b\u102c\u1038\u104a \u1021\u1006\u1031\u102c\u1000\u103a\u1021\u1026\u101d\u1014\u103a\u1006\u1031\u102c\u1004\u103a\u1019\u103e\u102f\u1021\u101d\u1004\u103a\u101d \u101e\u102d\u102f\u1037\u1019\u101f\u102f\u1010\u103a \u1005\u1000\u103a\u1019\u103e\u102f\u101c\u102f\u1015\u103a\u1004\u1014\u103a\u1038 feeders \u1019\u103b\u102c\u1038 \u1015\u102b\u101d\u1004\u103a\u101e\u100a\u103a\u104b<\/li>\n<li><strong>\u101b\u103d\u1031\u1038\u1001\u103b\u101a\u103a\u1019\u103e\u102f<\/strong> downstream breaker \u1019\u103b\u102c\u1038\u1014\u103e\u1004\u1037\u103a \u100a\u103e\u102d\u1014\u103e\u102d\u102f\u1004\u103a\u1038\u1019\u103e\u102f \u101c\u102d\u102f\u1021\u1015\u103a\u101e\u100a\u103a\u104b<\/li>\n<li><strong>\u1006\u1000\u103a\u101e\u103d\u101a\u103a\u101b\u1031\u1038<\/strong> BMS\/SCADA \u1014\u103e\u1004\u1037\u103a \u1015\u1031\u102b\u1004\u103a\u1038\u1005\u100a\u103a\u1038\u101b\u1014\u103a \u101c\u102d\u102f\u1021\u1015\u103a\u101e\u100a\u103a\u104b<\/li>\n<\/ul>\n<h2>Large Frame MCCB \u1019\u103b\u102c\u1038 (630A \u2013 1600A)<\/h2>\n<p>Large-frame MCCB \u1019\u103b\u102c\u1038\u101e\u100a\u103a main incomer \u1019\u103b\u102c\u1038\u104a switchgear bus \u1000\u100f\u1039\u100d\u1019\u103b\u102c\u1038\u1014\u103e\u1004\u1037\u103a \u101c\u1031\u1038\u101c\u1036\u101e\u1031\u102c \u1005\u1000\u103a\u1019\u103e\u102f\u101d\u1014\u103a\u1019\u103b\u102c\u1038\u1000\u102d\u102f \u1000\u102c\u1000\u103d\u101a\u103a\u1015\u1031\u1038\u101e\u100a\u103a\u104b \u1024 breaker \u1019\u103b\u102c\u1038\u101e\u100a\u103a utility supply (\u101e\u102d\u102f\u1037\u1019\u101f\u102f\u1010\u103a on-site generation) \u1014\u103e\u1004\u1037\u103a facility \u104f \u1016\u103c\u1014\u1037\u103a\u1016\u103c\u1030\u1038\u101b\u1031\u1038\u1005\u1014\u1005\u103a\u1000\u103c\u102c\u1038\u1010\u103d\u1004\u103a \u1021\u1013\u102d\u1000 \u1000\u102c\u1000\u103d\u101a\u103a\u101b\u1031\u1038\u1000\u102d\u101b\u102d\u101a\u102c\u1021\u1016\u103c\u1005\u103a \u101c\u102f\u1015\u103a\u1006\u1031\u102c\u1004\u103a\u101e\u100a\u103a\u104b \u1024\u1021\u1010\u102d\u102f\u1004\u103a\u1038\u1021\u1010\u102c\u1010\u103d\u1004\u103a\u104a breaker \u1010\u1005\u103a\u1001\u102f \u1015\u103b\u1000\u103a\u1000\u103d\u1000\u103a\u1015\u102b\u1000 \u1021\u1006\u1031\u102c\u1000\u103a\u1021\u1026\u1010\u1005\u103a\u1001\u102f\u101c\u102f\u1036\u1038 \u101e\u102d\u102f\u1037\u1019\u101f\u102f\u1010\u103a \u1011\u102f\u1010\u103a\u101c\u102f\u1015\u103a\u1019\u103e\u102f\u101c\u102d\u102f\u1004\u103a\u1038\u1000\u102d\u102f \u1015\u102d\u1010\u103a\u1015\u1005\u103a\u1014\u102d\u102f\u1004\u103a\u101e\u100a\u103a\u2014\u101a\u102f\u1036\u1000\u103c\u100a\u103a\u1005\u102d\u1010\u103a\u1001\u103b\u101b\u1019\u103e\u102f\u1014\u103e\u1004\u1037\u103a \u100a\u103e\u102d\u1014\u103e\u102d\u102f\u1004\u103a\u1038\u1019\u103e\u102f\u101e\u100a\u103a \u100a\u103e\u102d\u1014\u103e\u102d\u102f\u1004\u103a\u1038\u104d\u1019\u101b\u1015\u102b\u104b.<\/p>\n<h3>\u1005\u1036\u1014\u103e\u102f\u1014\u103a\u1038\u101e\u1010\u103a\u1019\u103e\u1010\u103a\u1011\u102c\u1038\u101e\u1031\u102c \u101c\u1000\u103a\u101b\u103e\u102d\u1021\u1006\u1004\u1037\u103a\u1019\u103b\u102c\u1038<\/h3>\n<table>\n<tbody>\n<tr>\n<td><strong>\u1021\u1006\u1004\u1037\u103a\u101e\u1010\u103a\u1019\u103e\u1010\u103a\u1001\u103b\u1000\u103a (A)<\/strong><\/td>\n<td><strong>\u1015\u1036\u102f\u1019\u103d\u1014\u1039\u1021\u101e\u1036\u102f\u1038\u1001\u103a\u103b\u1001\u1004\u1039\u1038<\/strong><\/td>\n<td><strong>Typical Icu Range<\/strong><\/td>\n<\/tr>\n<tr>\n<td><strong>630A<\/strong><\/td>\n<td>\u101e\u1031\u1038\u1004\u101a\u103a\u101e\u1031\u102c \u1005\u1000\u103a\u1019\u103e\u102f\u101c\u102f\u1015\u103a\u1004\u1014\u103a\u1038 main incomer\u104a \u1000\u103c\u102e\u1038\u1019\u102c\u1038\u101e\u1031\u102c \u1021\u1006\u1031\u102c\u1000\u103a\u1021\u1026\u101d\u1014\u103a\u1006\u1031\u102c\u1004\u103a\u1019\u103e\u102f<\/td>\n<td>50kA \u2013 100kA<\/td>\n<\/tr>\n<tr>\n<td><strong>800A<\/strong><\/td>\n<td>\u1021\u101c\u101a\u103a\u1021\u101c\u1010\u103a \u1005\u1000\u103a\u1019\u103e\u102f\u101c\u102f\u1015\u103a\u1004\u1014\u103a\u1038 main\u104a \u1021\u1006\u1031\u102c\u1000\u103a\u1021\u1026\u1015\u1031\u102b\u1004\u103a\u1038\u1005\u102f\u1036 \u1000\u103b\u1031\u102c\u1004\u103a\u1038\u101d\u1004\u103a\u1038\u1016\u103c\u1014\u1037\u103a\u1016\u103c\u1030\u1038\u101b\u1031\u1038<\/td>\n<td>65kA \u2013 100kA<\/td>\n<\/tr>\n<tr>\n<td><strong>1000A<\/strong><\/td>\n<td>\u1005\u1000\u103a\u1019\u103e\u102f\u101c\u102f\u1015\u103a\u1004\u1014\u103a\u1038 main switchboard\u104a data center UPS incomer<\/td>\n<td>65kA \u2013 100kA<\/td>\n<\/tr>\n<tr>\n<td><strong>1250A<\/strong><\/td>\n<td>\u101c\u1031\u1038\u101c\u1036\u101e\u1031\u102c \u1005\u1000\u103a\u1019\u103e\u102f\u101c\u102f\u1015\u103a\u1004\u1014\u103a\u1038 mains\u104a \u1000\u103c\u102e\u1038\u1019\u102c\u1038\u101e\u1031\u102c \u1005\u102e\u1038\u1015\u103d\u102c\u1038\u101b\u1031\u1038\u1021\u1006\u1031\u102c\u1000\u103a\u1021\u1026\u1019\u103b\u102c\u1038<\/td>\n<td>85kA \u2013 100kA<\/td>\n<\/tr>\n<tr>\n<td><strong>1600A<\/strong><\/td>\n<td>\u1021\u1019\u103c\u1004\u1037\u103a\u1006\u102f\u1036\u1038 MCCB \u1021\u1006\u1004\u1037\u103a\u101e\u1010\u103a\u1019\u103e\u1010\u103a\u1001\u103b\u1000\u103a; main switchgear\u104a primary incomer \u1019\u103b\u102c\u1038<\/td>\n<td>85kA \u2013 150kA<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<h3>\u1014\u100a\u103a\u1038\u1015\u100a\u102c\u1006\u102d\u102f\u1004\u103a\u101b\u102c \u101c\u1000\u1039\u1001\u100f\u102c\u1019\u103b\u102c\u1038<\/h3>\n<p><strong>\u1031\u1006\u1038\u1031\u107e<\/strong>: Large frame \u1019\u103b\u102c\u1038\u101e\u100a\u103a MCCB \u1014\u100a\u103a\u1038\u1015\u100a\u102c\u1010\u103d\u1004\u103a \u101b\u101b\u103e\u102d\u1014\u102d\u102f\u1004\u103a\u101e\u1031\u102c \u1021\u1019\u103c\u1004\u1037\u103a\u1006\u102f\u1036\u1038 Icu \u1021\u1006\u1004\u1037\u103a\u101e\u1010\u103a\u1019\u103e\u1010\u103a\u1001\u103b\u1000\u103a\u201465-150kA \u1000\u102d\u102f \u1015\u1031\u1038\u1006\u1031\u102c\u1004\u103a\u1015\u102b\u101e\u100a\u103a\u104b \u1024\u1021\u1006\u1004\u1037\u103a\u1021\u1011\u1000\u103a\u1010\u103d\u1004\u103a\u104a \u101e\u1004\u103a\u101e\u100a\u103a \u1015\u102f\u1036\u1019\u103e\u1014\u103a\u1021\u102c\u1038\u1016\u103c\u1004\u1037\u103a \u101b\u103d\u103e\u1031\u1037\u1015\u103c\u1031\u102c\u1004\u103a\u1038\u101e\u100a\u103a\u104b <a href=\"https:\/\/test.viox.com\/my\/complete-guide-to-air-circuit-breakers-acb\/\">Air Circuit Breakers (ACBs)<\/a> draw-out \u1010\u100a\u103a\u1006\u1031\u102c\u1000\u103a\u1019\u103e\u102f\u1014\u103e\u1004\u1037\u103a\u1021\u1010\u1030\u104b.<\/p>\n<p><strong>Advanced Electronic Trip Units<\/strong>: Large-frame MCCB \u1019\u103b\u102c\u1038\u1010\u103d\u1004\u103a \u1001\u1031\u1010\u103a\u1019\u102e\u101e\u1031\u102c microprocessor-controlled trip unit \u1019\u103b\u102c\u1038 \u1015\u102b\u101b\u103e\u102d\u101e\u100a\u103a\u104b<\/p>\n<ul>\n<li><strong>\u1015\u101b\u102d\u102f\u1002\u101b\u1019\u103a\u1015\u103c\u102f\u101c\u102f\u1015\u103a\u1014\u102d\u102f\u1004\u103a\u101e\u1031\u102c \u1021\u1001\u103b\u102d\u1014\u103a-\u101c\u103b\u103e\u1015\u103a\u1005\u102e\u1038\u1000\u103c\u1031\u102c\u1004\u103a\u1038\u1019\u103b\u1009\u103a\u1038\u1000\u103d\u1031\u1038\u1019\u103b\u102c\u1038<\/strong>: ANSI curve \u1019\u103b\u102c\u1038\u104a IEC curve \u1019\u103b\u102c\u1038 \u101e\u102d\u102f\u1037\u1019\u101f\u102f\u1010\u103a \u1005\u102d\u1010\u103a\u1000\u103c\u102d\u102f\u1000\u103a\u1006\u1000\u103a\u1010\u1004\u103a\u1019\u103b\u102c\u1038<\/li>\n<li><strong>\u1019\u103c\u1031\u1015\u103c\u1004\u103a\u1001\u103b\u102d\u102f\u1037\u101a\u103d\u1004\u103a\u1038\u1019\u103e\u102f \u1000\u102c\u1000\u103d\u101a\u103a\u101b\u1031\u1038<\/strong>: \u1001\u103b\u102d\u1014\u103a\u100a\u103e\u102d\u1014\u102d\u102f\u1004\u103a\u101e\u1031\u102c \u1021\u102c\u101b\u102f\u1036\u1001\u1036\u1014\u102d\u102f\u1004\u103a\u1005\u103d\u1019\u103a\u1038\u1014\u103e\u1004\u1037\u103a \u1021\u1001\u103b\u102d\u1014\u103a\u1014\u103e\u1031\u102c\u1004\u1037\u103a\u1014\u103e\u1031\u1038 (30mA \u1019\u103e 1200A)<\/li>\n<li><strong>Neutral protection<\/strong>: neutral current \u1005\u1031\u102c\u1004\u1037\u103a\u1000\u103c\u100a\u1037\u103a\u1001\u103c\u1004\u103a\u1038\u1015\u102b\u101b\u103e\u102d\u101e\u1031\u102c 4-pole \u101a\u1030\u1014\u1005\u103a\u1019\u103b\u102c\u1038<\/li>\n<li><strong>Arc-fault detection<\/strong>: \u1019\u102e\u1038\u1018\u1031\u1038\u1000\u102c\u1000\u103d\u101a\u103a\u101b\u1031\u1038\u1021\u1010\u103d\u1000\u103a \u101b\u103d\u1031\u1038\u1001\u103b\u101a\u103a\u1014\u102d\u102f\u1004\u103a\u101e\u1031\u102c AFCI module \u1019\u103b\u102c\u1038<\/li>\n<li><strong>Metering \u1014\u103e\u1004\u1037\u103a data logging<\/strong>: Real-time current, voltage, power, energy, harmonics<\/li>\n<li><strong>\u1006\u1000\u103a\u101e\u103d\u101a\u103a\u101b\u1031\u1038 protocols<\/strong>: Modbus TCP\/IP, Profinet, BACnet \u1015\u1031\u102b\u1004\u103a\u1038\u1005\u100a\u103a\u1038\u1019\u103e\u102f\u1021\u1010\u103d\u1000\u103a<\/li>\n<\/ul>\n<p><strong>\u101b\u102f\u1015\u103a\u1015\u102d\u102f\u1004\u103a\u1038\u1006\u102d\u102f\u1004\u103a\u101b\u102c \u1021\u1010\u102d\u102f\u1004\u103a\u1038\u1021\u1010\u102c\u1019\u103b\u102c\u1038<\/strong>: 1600A 4-pole MCCB \u101e\u100a\u103a 300mm (W) x 380mm (H) x 140mm (D) \u1000\u102d\u102f \u1010\u102d\u102f\u1004\u103a\u1038\u1010\u102c\u1014\u102d\u102f\u1004\u103a\u101e\u100a\u103a\u104b \u1021\u101c\u1031\u1038\u1001\u103b\u102d\u1014\u103a 15kg \u1000\u103b\u1031\u102c\u103a\u101c\u103d\u1014\u103a\u101e\u100a\u103a\u104b \u1010\u1015\u103a\u1006\u1004\u103a\u1001\u103c\u1004\u103a\u1038\u101e\u100a\u103a \u101e\u1010\u103a\u1019\u103e\u1010\u103a\u1011\u102c\u1038\u101e\u1031\u102c busbar \u101e\u102d\u102f\u1037\u1019\u101f\u102f\u1010\u103a cable lug \u1019\u103b\u102c\u1038\u101e\u102d\u102f\u1037 \u101e\u1004\u1037\u103a\u101c\u103b\u1031\u102c\u103a\u101e\u1031\u102c torque \u101e\u1010\u103a\u1019\u103e\u1010\u103a\u1001\u103b\u1000\u103a\u1019\u103b\u102c\u1038 (\u1019\u103b\u102c\u1038\u101e\u1031\u102c\u1021\u102c\u1038\u1016\u103c\u1004\u1037\u103a 40-60 Nm terminal torque) \u1016\u103c\u1004\u1037\u103a \u101c\u102f\u1036\u1001\u103c\u102f\u1036\u1005\u103d\u102c \u1010\u1015\u103a\u1006\u1004\u103a\u101b\u1014\u103a \u101c\u102d\u102f\u1021\u1015\u103a\u101e\u100a\u103a\u104b.<\/p>\n<p><strong>\u1005\u1019\u103a\u1038\u101e\u1015\u103a\u1001\u103c\u1004\u103a\u1038\u1014\u103e\u1004\u1037\u103a \u1015\u103c\u102f\u1015\u103c\u1004\u103a\u1011\u102d\u1014\u103a\u1038\u101e\u102d\u1019\u103a\u1038\u1001\u103c\u1004\u103a\u1038\u104b<\/strong>: IEC 60947-2 \u101e\u100a\u103a large-frame MCCB \u1019\u103b\u102c\u1038\u1021\u102c\u1038 \u101e\u102e\u1038\u1001\u103c\u102c\u1038\u1005\u1019\u103a\u1038\u101e\u1015\u103a\u1019\u103e\u102f\u1021\u1005\u102e\u1021\u1005\u1009\u103a\u1019\u103b\u102c\u1038\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 \u1000\u103c\u102e\u1038\u1019\u102c\u1038\u101e\u1031\u102c \u1001\u103b\u102d\u102f\u1037\u101a\u103d\u1004\u103a\u1038\u1019\u103e\u102f\u1019\u103b\u102c\u1038 (Icu \u1021\u1014\u102e\u1038) \u1015\u103c\u102e\u1038\u1014\u1031\u102c\u1000\u103a\u104a contact erosion\u104a arc chute \u1021\u1001\u103c\u1031\u1021\u1014\u1031\u1014\u103e\u1004\u1037\u103a \u101a\u1014\u1039\u1010\u101b\u102c\u1038 \u101d\u1010\u103a\u1006\u1004\u103a\u1019\u103e\u102f\u1000\u102d\u102f \u1005\u1005\u103a\u1006\u1031\u1038\u1015\u102b\u104b \u1006\u102d\u102f\u1000\u103a\u1021\u1019\u103b\u102c\u1038\u1021\u1015\u103c\u102c\u1038\u101e\u100a\u103a \u1014\u103e\u1005\u103a\u1005\u1009\u103a \u1001\u101b\u102e\u1038\u1005\u1009\u103a\u1005\u1019\u103a\u1038\u101e\u1015\u103a\u1001\u103c\u1004\u103a\u1038\u1014\u103e\u1004\u1037\u103a 3-5 \u1014\u103e\u1005\u103a contact resistance \u1005\u1005\u103a\u1006\u1031\u1038\u1001\u103c\u1004\u103a\u1038\u1000\u102d\u102f \u1015\u103c\u102f\u101c\u102f\u1015\u103a\u101e\u100a\u103a\u104b.<\/p>\n<h3>Switchgear Main Incomer \u1025\u1015\u1019\u102c<\/h3>\n<p>2500kVA \/ 400V \u1005\u1000\u103a\u1019\u103e\u102f\u101c\u102f\u1015\u103a\u1004\u1014\u103a\u1038\u1021\u1010\u103d\u1000\u103a (\u1001\u1014\u1037\u103a\u1019\u103e\u1014\u103a\u1038\u1001\u103c\u1031\u101d\u1014\u103a 3608A, demand factor 0.6 = 2165A):<\/p>\n<ol>\n<li><strong>\u1001\u103b\u102d\u102f\u1037\u101a\u103d\u1004\u103a\u1038\u1019\u103e\u102f\u1021\u1006\u1004\u1037\u103a\u1000\u102d\u102f \u1010\u103d\u1000\u103a\u1001\u103b\u1000\u103a\u1015\u102b\u104b<\/strong>: Utility fault contribution = service point \u1010\u103d\u1004\u103a 80kA<\/li>\n<li><strong>Breaker \u1021\u1006\u1004\u1037\u103a\u101e\u1010\u103a\u1019\u103e\u1010\u103a\u1001\u103b\u1000\u103a\u1000\u102d\u102f \u101b\u103d\u1031\u1038\u1001\u103b\u101a\u103a\u1015\u102b<\/strong>: 1600A MCCB \u1000\u102d\u102f \u101b\u103d\u1031\u1038\u1001\u103b\u101a\u103a\u1015\u102b (2165A \u101d\u1014\u103a\u1011\u1000\u103a \u1014\u1031\u102c\u1000\u103a\u1011\u1015\u103a\u1005\u1036\u1021\u101b\u103d\u101a\u103a\u1021\u1005\u102c\u1038\u104a \u1010\u102d\u102f\u1038\u1010\u1000\u103a\u1019\u103e\u102f\u1021\u1010\u103d\u1000\u103a \u1001\u103d\u1004\u1037\u103a\u1015\u103c\u102f\u101e\u100a\u103a)<\/li>\n<li><strong>Breaking capacity \u1000\u102d\u102f \u101e\u1010\u103a\u1019\u103e\u1010\u103a\u1015\u102b\u104b<\/strong>: Icu \u2265 80kA; \u1018\u1031\u1038\u1000\u1004\u103a\u1038\u101c\u102f\u1036\u1001\u103c\u102f\u1036\u101b\u1031\u1038\u1021\u1010\u103d\u1000\u103a 100kA \u1018\u1031\u102c\u1004\u103a\u1000\u102d\u102f \u101b\u103d\u1031\u1038\u1001\u103b\u101a\u103a\u1015\u102b\u104b<\/li>\n<li><strong>\u1001\u101b\u102e\u1038\u1005\u1009\u103a\u1006\u1000\u103a\u1010\u1004\u103a\u1019\u103b\u102c\u1038<\/strong>: Ir = 0.9 x 1600A = 1440A, Isd = 6400A \/ 0.4s, Ii = 15000A<\/li>\n<li><strong>\u100a\u103e\u102d\u1014\u103e\u102d\u102f\u1004\u103a\u1038\u1006\u1031\u102c\u1004\u103a\u101b\u103d\u1000\u103a\u1001\u103c\u1004\u103a\u1038<\/strong>: Verify selectivity with downstream 630A feeders using time-current curves<\/li>\n<li><strong>\u1006\u1000\u103a\u101e\u103d\u101a\u103a\u101b\u1031\u1038<\/strong>: Connect to SCADA for load monitoring and remote trip capability<\/li>\n<\/ol>\n<h3>ACB vs. Large-Frame MCCB<\/h3>\n<p><strong>Stick with MCCB if<\/strong>:<\/p>\n<ul>\n<li>Current \u2264 1600A<\/li>\n<li>Fault level \u2264 100kA (or 150kA with high-performance models)<\/li>\n<li>Fixed installation (no requirement for draw-out servicing)<\/li>\n<li>Budget constraints favor compact MCCB over ACB<\/li>\n<\/ul>\n<p><strong>Switch to ACB if<\/strong>:<\/p>\n<ul>\n<li>Current &gt; 1600A (ACBs extend to 6300A+)<\/li>\n<li>Draw-out construction needed for maintenance without downtime<\/li>\n<li>Extremely high fault levels (&gt;100kA) require ACB interrupting technology<\/li>\n<li>Application demands visible contact separation or extensive auxiliary contacts<\/li>\n<\/ul>\n<h3>When to Choose Large Frame<\/h3>\n<ul>\n<li><strong>\u101c\u1000\u103a\u101b\u103e\u102d\u1000\u102d\u102f \u1006\u103d\u1032\u1001\u103b\u1015\u102b\u104b<\/strong> 630-1600A<\/li>\n<li><strong>Fault level<\/strong> 50-150kA<\/li>\n<li><strong>\u101c\u103b\u103e\u1031\u102c\u1000\u103a\u101c\u103d\u103e\u102c<\/strong> involves main incomers, switchgear, or critical distribution points<\/li>\n<li><strong>\u1021\u1006\u1004\u1037\u103a\u1019\u103c\u1004\u1037\u103a\u1000\u102c\u1000\u103d\u101a\u103a\u1019\u103e\u102f<\/strong> (metering, communication, ground-fault) is required<\/li>\n<li><strong>Budget and space<\/strong> favor MCCB over ACB technology<\/li>\n<\/ul>\n<h2>How to Read MCCB Rating Plates<\/h2>\n<p>Every IEC-compliant MCCB carries a rating plate (nameplate) that displays critical specification data. Understanding how to decode this information ensures you select, install, and maintain breakers correctly.<\/p>\n<h3>Essential Nameplate Information<\/h3>\n<p>A typical MCCB rating plate includes:<\/p>\n<ul>\n<li><strong>1. Manufacturer and Model<\/strong>: Brand name and product series (e.g., \u201cVIOX VMC3-630\u201d)<\/li>\n<li><strong>2. IEC Standard Marking<\/strong>: \u201cIEC 60947-2\u201d or \u201cEN 60947-2\u201d confirms compliance<\/li>\n<li><strong>3. Rated Current (In)<\/strong>: The breaker\u2019s nominal current rating at reference ambient (40\u00b0C)<\/li>\n<li><strong>4. Rated Voltage (Ue)<\/strong>: Operational voltage rating (e.g., 690V AC, 250V DC)<\/li>\n<li><strong>5. Breaking Capacity (Icu \/ Ics)<\/strong>: Icu (Ultimate) and Ics (Service) limits in kA<\/li>\n<li><strong>6. Utilization Category<\/strong>: Category A (instantaneous) or Category B (time-delayed)<\/li>\n<li><strong>7. Rated Insulation Voltage (Ui)<\/strong>: Maximum system voltage withstand<\/li>\n<li><strong>8. Rated Impulse Withstand Voltage (Uimp)<\/strong>: Surge immunity (e.g., 8kV)<\/li>\n<li><strong>9. Poles and Configuration<\/strong>: 3P or 4P<\/li>\n<li><strong>10. Trip Settings<\/strong>: Ranges for Ir, Isd, Ii (if adjustable)<\/li>\n<li><strong>11. Certifications<\/strong>: CE, CCC, UL marks<\/li>\n<\/ul>\n<figure><img decoding=\"async\" src=\"https:\/\/img.viox.com\/mccb-rating-plate-example-showing-all-specifications.webp\" alt=\"MCCB Rating Plate Example showing all specifications\" \/><figcaption>Figure 3: Detailed MCCB rating plate displaying essential specifications: In (rated current), Ue (operating voltage), Icu\/Ics (breaking capacity), IEC 60947-2 compliance, trip settings, and certification marks. Always verify these parameters match your design requirements before installation.<\/figcaption><\/figure>\n<h3>What to Verify Before Installation<\/h3>\n<ol>\n<li><strong>In \u2265 calculated load current<\/strong> (with derating for temperature\/grouping if applicable)<\/li>\n<li><strong>Ue = system voltage<\/strong> (must match; 400V breaker cannot protect 690V system)<\/li>\n<li><strong>Icu \u2265 \u1016\u103c\u1005\u103a\u1014\u102d\u102f\u1004\u103a\u1001\u103b\u1031\u101b\u103e\u102d\u101e\u1031\u102c \u1001\u103b\u102d\u102f\u1037\u101a\u103d\u1004\u103a\u1038\u1001\u103b\u1000\u103a\u101c\u103b\u103e\u1015\u103a\u1005\u102e\u1038\u1000\u103c\u1031\u102c\u1004\u103a\u1038<\/strong> \u1010\u1015\u103a\u1006\u1004\u103a\u101e\u100a\u1037\u103a\u1014\u1031\u101b\u102c\u1010\u103d\u1004\u103a<\/li>\n<li><strong>Ics appropriate<\/strong> for application (75-100% for most critical applications)<\/li>\n<li><strong>Poles match system<\/strong>: 3P for three-phase, 4P if neutral protection required<\/li>\n<li><strong>\u1001\u101b\u102e\u1038\u1005\u1009\u103a\u1006\u1000\u103a\u1010\u1004\u103a\u1019\u103b\u102c\u1038<\/strong> (if adjustable) configured per coordination study<\/li>\n<li><strong>\u101c\u1000\u1039\u1019\u103d\u1010\u1039\u1019\u103a\u102c\u1038<\/strong> valid for installation region<\/li>\n<\/ol>\n<h2>Selection Guide by Application<\/h2>\n<p>Choosing the right MCCB current rating depends on your specific application, load type, fault level, and coordination requirements.<\/p>\n<h3>\u1021\u1019\u103c\u1014\u103a\u101b\u103d\u1031\u1038\u1001\u103b\u101a\u103a\u1019\u103e\u102f \u1007\u101a\u102c\u1038<\/h3>\n<table>\n<tbody>\n<tr>\n<td><strong>\u101c\u103b\u103e\u1031\u102c\u1000\u103a\u101c\u103d\u103e\u102c<\/strong><\/td>\n<td><strong>Load Current<\/strong><\/td>\n<td><strong>Recommended MCCB Rating<\/strong><\/td>\n<td><strong>Typical Icu<\/strong><\/td>\n<\/tr>\n<tr>\n<td>Small motor (7.5kW)<\/td>\n<td>15A<\/td>\n<td><strong>20A or 25A<\/strong><\/td>\n<td>25-36kA<\/td>\n<\/tr>\n<tr>\n<td>\u1021\u101c\u1010\u103a\u1005\u102c\u1038\u1019\u1031\u102c\u103a\u1010\u102c (30kW)<\/td>\n<td>57A<\/td>\n<td><strong>63A \u101e\u102d\u102f\u1037\u1019\u101f\u102f\u1010\u103a 80A<\/strong><\/td>\n<td>36-50kA<\/td>\n<\/tr>\n<tr>\n<td>\u1021\u1000\u103c\u102e\u1038\u1005\u102c\u1038\u1019\u1031\u102c\u103a\u1010\u102c (110kW)<\/td>\n<td>200A<\/td>\n<td><strong>250A<\/strong><\/td>\n<td>50-65kA<\/td>\n<\/tr>\n<tr>\n<td>\u101b\u102f\u1036\u1038\u1001\u1014\u103a\u1038\u1021\u1011\u1015\u103a\u1021\u1010\u103d\u1000\u103a \u1015\u102b\u101d\u102b\u1015\u1031\u1038\u101c\u102d\u102f\u1004\u103a\u1038<\/td>\n<td>180A<\/td>\n<td><strong>200A \u101e\u102d\u102f\u1037\u1019\u101f\u102f\u1010\u103a 250A<\/strong><\/td>\n<td>36-50kA<\/td>\n<\/tr>\n<tr>\n<td>\u1021\u1006\u1031\u102c\u1000\u103a\u1021\u1026\u104f \u1015\u1004\u103a\u1019\u1001\u103d\u1032\u101c\u102d\u102f\u1004\u103a\u1038<\/td>\n<td>450A<\/td>\n<td><strong>500A \u101e\u102d\u102f\u1037\u1019\u101f\u102f\u1010\u103a 630A<\/strong><\/td>\n<td>50-65kA<\/td>\n<\/tr>\n<tr>\n<td>\u101e\u1031\u1038\u1004\u101a\u103a\u101e\u1031\u102c \u101d\u1014\u103a\u1006\u1031\u102c\u1004\u103a\u1019\u103e\u102f\u101d\u1004\u103a\u1015\u1031\u102b\u1000\u103a<\/td>\n<td>650A<\/td>\n<td><strong>800A<\/strong><\/td>\n<td>65-85kA<\/td>\n<\/tr>\n<tr>\n<td>\u1005\u1000\u103a\u1019\u103e\u102f\u101c\u102f\u1015\u103a\u1004\u1014\u103a\u1038\u101e\u102f\u1036\u1038 \u1015\u1004\u103a\u1019\u101c\u102d\u102f\u1004\u103a\u1038<\/td>\n<td>1200A<\/td>\n<td><strong>1250A \u101e\u102d\u102f\u1037\u1019\u101f\u102f\u1010\u103a 1600A<\/strong><\/td>\n<td>85-100kA<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<h3>\u1021\u101b\u1031\u1038\u1000\u103c\u102e\u1038\u101e\u1031\u102c \u101b\u103d\u1031\u1038\u1001\u103b\u101a\u103a\u1019\u103e\u102f \u101e\u1010\u102d\u1015\u1031\u1038\u1001\u103b\u1000\u103a\u1019\u103b\u102c\u1038<\/h3>\n<ol>\n<li><strong>In \u1021\u101b\u103d\u101a\u103a\u1021\u1005\u102c\u1038\u1000\u102d\u102f \u1018\u101a\u103a\u1010\u1031\u102c\u1037\u1019\u103e \u101e\u1031\u1038\u1004\u101a\u103a\u1021\u1031\u102c\u1004\u103a \u1019\u101c\u102f\u1015\u103a\u1015\u102b\u1014\u103e\u1004\u1037\u103a\u104b<\/strong>: Breaker \u1010\u1005\u103a\u1001\u102f\u101e\u100a\u103a \u104e\u1004\u103a\u1038\u104f \u101e\u1010\u103a\u1019\u103e\u1010\u103a\u1014\u103e\u102f\u1014\u103a\u1038\u104f 90% \u1000\u102d\u102f \u1021\u1006\u1000\u103a\u1019\u1015\u103c\u1010\u103a \u101e\u101a\u103a\u1006\u1031\u102c\u1004\u103a\u1015\u102b\u1000 \u1021\u1015\u1030\u101c\u103d\u1014\u103a\u1000\u1032\u1015\u103c\u102e\u1038 \u101a\u102d\u102f\u101a\u103d\u1004\u103a\u1038\u101c\u102c\u1019\u100a\u103a\u1016\u103c\u1005\u103a\u101e\u100a\u103a\u104b<\/li>\n<li><strong>Icu \u1000\u102d\u102f \u1021\u1019\u103c\u1032\u1005\u1005\u103a\u1006\u1031\u1038\u1015\u102b\u104b<\/strong>: \u1021\u101b\u103d\u101a\u103a\u1021\u1005\u102c\u1038\u1019\u101c\u102f\u1036\u101c\u1031\u102c\u1000\u103a\u101e\u1031\u102c \u1016\u103c\u1010\u103a\u1010\u1031\u102c\u1000\u103a\u1014\u102d\u102f\u1004\u103a\u1005\u103d\u1019\u103a\u1038\u101e\u100a\u103a \u1001\u103b\u102d\u102f\u1037\u101a\u103d\u1004\u103a\u1038\u1019\u103e\u102f\u1019\u103b\u102c\u1038\u1021\u1010\u103d\u1004\u103a\u1038 Breaker \u104f \u1006\u102d\u102f\u1038\u101b\u103d\u102c\u1038\u101e\u1031\u102c \u1015\u103b\u1000\u103a\u1005\u102e\u1038\u1019\u103e\u102f\u1000\u102d\u102f \u1016\u103c\u1005\u103a\u1005\u1031\u1014\u102d\u102f\u1004\u103a\u101e\u100a\u103a\u104b<\/li>\n<li><strong>\u1015\u1010\u103a\u101d\u1014\u103a\u1038\u1000\u103b\u1004\u103a\u1021\u1015\u1030\u1001\u103b\u102d\u1014\u103a\u1000\u102d\u102f \u1005\u1005\u103a\u1006\u1031\u1038\u1015\u102b\u104b<\/strong>: \u1005\u1036\u1014\u103e\u102f\u1014\u103a\u1038\u101e\u1010\u103a\u1019\u103e\u1010\u103a\u1001\u103b\u1000\u103a\u1019\u103b\u102c\u1038\u101e\u100a\u103a 40\u00b0C \u1000\u102d\u102f \u101a\u1030\u1006\u101e\u100a\u103a; \u1019\u103c\u1004\u1037\u103a\u1019\u102c\u1038\u101e\u1031\u102c\u1021\u1015\u1030\u1001\u103b\u102d\u1014\u103a\u1019\u103b\u102c\u1038\u1021\u1010\u103d\u1000\u103a \u101c\u103b\u103e\u1031\u102c\u1037\u1001\u103b\u1015\u102b (50\u00b0C \u1010\u103d\u1004\u103a 0.9x, 60\u00b0C \u1010\u103d\u1004\u103a 0.8x)<\/li>\n<li><strong>Time-current curves \u1019\u103b\u102c\u1038\u1000\u102d\u102f \u100a\u103e\u102d\u1014\u103e\u102d\u102f\u1004\u103a\u1038\u1015\u102b\u104b<\/strong>: \u1016\u103c\u1014\u1037\u103a\u1016\u103c\u1030\u1038\u101b\u1031\u1038\u1005\u1014\u1005\u103a\u1010\u1005\u103a\u1001\u102f\u101c\u102f\u1036\u1038\u1010\u103d\u1004\u103a \u101b\u103d\u1031\u1038\u1001\u103b\u101a\u103a\u1014\u102d\u102f\u1004\u103a\u1005\u103d\u1019\u103a\u1038\u1000\u102d\u102f \u1021\u1010\u100a\u103a\u1015\u103c\u102f\u101b\u1014\u103a \u1011\u102f\u1010\u103a\u101c\u102f\u1015\u103a\u101e\u1030\u104f \u1006\u1031\u102c\u1037\u1016\u103a\u101d\u1032\u1000\u102d\u102f \u1021\u101e\u102f\u1036\u1038\u1015\u103c\u102f\u1015\u102b\u104b<\/li>\n<li><strong>\u1021\u1014\u102c\u1002\u1010\u103a\u1010\u103d\u1004\u103a \u1010\u102d\u102f\u1038\u1010\u1000\u103a\u1019\u103e\u102f\u1000\u102d\u102f \u1011\u100a\u1037\u103a\u101e\u103d\u1004\u103a\u1038\u1005\u1009\u103a\u1038\u1005\u102c\u1038\u1015\u102b\u104b<\/strong>: \u1021\u1006\u1031\u102c\u1000\u103a\u1021\u1026 \u1010\u102d\u102f\u1038\u1001\u103b\u1032\u1037\u1019\u103e\u102f\u1021\u1010\u103d\u1000\u103a In \u1010\u103d\u1004\u103a 10-25% \u1021\u1015\u102d\u102f\u1011\u100a\u1037\u103a\u101e\u103d\u1004\u103a\u1038 \u101e\u1010\u103a\u1019\u103e\u1010\u103a\u1015\u102b\u104b<\/li>\n<\/ol>\n<figure><img decoding=\"async\" src=\"https:\/\/img.viox.com\/mccb-selection-decision-flowchart.webp\" alt=\"MCCB Selection Decision Flowchart\" \/><figcaption>\u1015\u102f\u1036 \u1045- \u101d\u1014\u103a\u1021\u102c\u1038\u1005\u102e\u1038\u1000\u103c\u1031\u102c\u1004\u103a\u1038\u1015\u1031\u102b\u103a \u1019\u1030\u1010\u100a\u103a\u104d frame size \u1000\u102d\u102f \u1006\u102f\u1036\u1038\u1016\u103c\u1010\u103a\u101b\u1014\u103a \u101c\u1019\u103a\u1038\u100a\u103d\u103e\u1014\u103a\u1015\u1031\u1038\u101e\u1031\u102c MCCB \u101b\u103d\u1031\u1038\u1001\u103b\u101a\u103a\u1019\u103e\u102f \u1005\u102e\u1038\u1006\u1004\u103a\u1038\u1015\u102f\u1036\u1007\u101a\u102c\u1038\u104a \u1011\u102d\u102f\u1037\u1014\u1031\u102c\u1000\u103a \u1016\u103c\u1010\u103a\u1010\u1031\u102c\u1000\u103a\u1014\u102d\u102f\u1004\u103a\u1005\u103d\u1019\u103a\u1038 \u1021\u1010\u100a\u103a\u1015\u103c\u102f\u1001\u103c\u1004\u103a\u1038\u104a \u101d\u1014\u103a\u1006\u1031\u102c\u1004\u103a\u1019\u103e\u102f\u1014\u103e\u102f\u1014\u103a\u1038 \u1005\u1005\u103a\u1006\u1031\u1038\u1001\u103c\u1004\u103a\u1038\u1014\u103e\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\u104b \u101e\u1004\u103a\u104f \u1021\u101e\u102f\u1036\u1038\u1001\u103b\u1019\u103e\u102f\u1021\u1010\u103d\u1000\u103a \u101e\u1004\u1037\u103a\u101c\u103b\u1031\u102c\u103a\u101e\u1031\u102c Breaker \u101e\u1010\u103a\u1019\u103e\u1010\u103a\u1001\u103b\u1000\u103a\u1000\u102d\u102f \u101e\u1031\u1001\u103b\u102c\u1005\u1031\u101b\u1014\u103a \u1024\u1005\u1014\u1005\u103a\u1010\u1000\u103b \u1001\u103b\u1009\u103a\u1038\u1000\u1015\u103a\u1014\u100a\u103a\u1038\u1000\u102d\u102f \u1021\u101e\u102f\u1036\u1038\u1015\u103c\u102f\u1015\u102b\u104b.<\/figcaption><\/figure>\n<h2>\u1014\u102d\u1002\u102f\u1036\u1038<\/h2>\n<p>16A \u1019\u103e 1600A \u1021\u1011\u102d \u1005\u1036 MCCB \u101c\u103b\u103e\u1015\u103a\u1005\u102e\u1038\u1000\u103c\u1031\u102c\u1004\u103a\u1038\u1014\u103e\u102f\u1014\u103a\u1038\u1019\u103b\u102c\u1038\u101e\u100a\u103a \u1001\u1031\u1010\u103a\u1019\u102e \u101c\u103b\u103e\u1015\u103a\u1005\u1005\u103a\u1016\u103c\u1014\u1037\u103a\u1016\u103c\u1030\u1038\u101b\u1031\u1038\u1005\u1014\u1005\u103a\u1019\u103b\u102c\u1038\u104f \u1021\u1001\u103c\u1031\u1001\u1036\u1021\u102f\u1010\u103a\u1019\u103c\u1005\u103a\u1016\u103c\u1005\u103a\u101e\u100a\u103a\u104b Frame size \u1019\u103b\u102c\u1038\u104a \u101c\u103b\u103e\u1015\u103a\u1005\u102e\u1038\u1000\u103c\u1031\u102c\u1004\u103a\u1038\u1014\u103e\u102f\u1014\u103a\u1038\u1019\u103b\u102c\u1038\u1014\u103e\u1004\u1037\u103a \u1016\u103c\u1010\u103a\u1010\u1031\u102c\u1000\u103a\u1014\u102d\u102f\u1004\u103a\u1005\u103d\u1019\u103a\u1038\u1019\u103b\u102c\u1038\u1021\u1000\u103c\u102c\u1038 \u1006\u1000\u103a\u1005\u1015\u103a\u1019\u103e\u102f\u1000\u102d\u102f \u1014\u102c\u1038\u101c\u100a\u103a\u1001\u103c\u1004\u103a\u1038\u1000 \u101e\u1004\u1037\u103a\u1021\u102c\u1038 \u1005\u1000\u103a\u1015\u1005\u1039\u1005\u100a\u103a\u1038\u1019\u103b\u102c\u1038\u1000\u102d\u102f \u1000\u102c\u1000\u103d\u101a\u103a\u1015\u1031\u1038\u1015\u103c\u102e\u1038 \u1005\u1014\u1005\u103a\u100a\u103e\u102d\u1014\u103e\u102d\u102f\u1004\u103a\u1038\u1019\u103e\u102f\u1000\u102d\u102f \u101e\u1031\u1001\u103b\u102c\u1005\u1031\u1000\u102c IEC 60947-2 \u1018\u1031\u1038\u1000\u1004\u103a\u1038\u101b\u1031\u1038 \u1005\u1036\u1014\u103e\u102f\u1014\u103a\u1038\u1019\u103b\u102c\u1038\u1014\u103e\u1004\u1037\u103a \u1000\u102d\u102f\u1000\u103a\u100a\u102e\u101e\u1031\u102c Breaker \u1019\u103b\u102c\u1038\u1000\u102d\u102f \u101e\u1010\u103a\u1019\u103e\u1010\u103a\u1014\u102d\u102f\u1004\u103a\u1005\u1031\u1015\u102b\u101e\u100a\u103a\u104b.<\/p>\n<p>\u1021\u1013\u102d\u1000\u1021\u1001\u103b\u1000\u103a\u1019\u103b\u102c\u1038-<\/p>\n<ul>\n<li><strong>\u101d\u1014\u103a\u101c\u102d\u102f\u1021\u1015\u103a\u1001\u103b\u1000\u103a\u1019\u103b\u102c\u1038\u1014\u103e\u1004\u1037\u103a In \u1000\u102d\u102f \u1000\u102d\u102f\u1000\u103a\u100a\u102e\u1021\u1031\u102c\u1004\u103a\u101c\u102f\u1015\u103a\u1015\u102b\u104b<\/strong> \u1010\u102d\u102f\u1038\u1010\u1000\u103a\u1019\u103e\u102f\u1014\u103e\u1004\u1037\u103a \u101c\u103b\u103e\u1031\u102c\u1037\u1001\u103b\u1001\u103c\u1004\u103a\u1038\u1021\u1010\u103d\u1000\u103a 10-25% \u1021\u1015\u102d\u102f\u1011\u100a\u1037\u103a\u101e\u103d\u1004\u103a\u1038\u1015\u102b\u104b<\/li>\n<li><strong>Fault studies \u1014\u103e\u1004\u1037\u103a Icu \u1000\u102d\u102f \u1010\u102d\u102f\u1000\u103a\u1006\u102d\u102f\u1004\u103a\u1005\u1005\u103a\u1006\u1031\u1038\u1015\u102b\u104b<\/strong>- \u1019\u101c\u102f\u1036\u101c\u1031\u102c\u1000\u103a\u101e\u1031\u102c \u1016\u103c\u1010\u103a\u1010\u1031\u102c\u1000\u103a\u1014\u102d\u102f\u1004\u103a\u1005\u103d\u1019\u103a\u1038\u101b\u103e\u102d\u101e\u1031\u102c Breaker \u1000\u102d\u102f \u1018\u101a\u103a\u1010\u1031\u102c\u1037\u1019\u103e \u1019\u1010\u1015\u103a\u1006\u1004\u103a\u1015\u102b\u1014\u103e\u1004\u1037\u103a\u104b<\/li>\n<li><strong>Frame size \u1000\u102d\u102f \u1015\u100a\u102c\u101b\u103e\u102d\u101b\u103e\u102d \u101b\u103d\u1031\u1038\u1001\u103b\u101a\u103a\u1015\u102b\u104b<\/strong>- \u226450kA \/ \u2264250A \u1021\u1010\u103d\u1000\u103a \u101e\u1031\u1038\u1004\u101a\u103a\u101e\u1031\u102c frame \u1019\u103b\u102c\u1038\u104a 30-85kA \/ 250-630A \u1021\u1010\u103d\u1000\u103a \u1021\u101c\u1010\u103a\u1005\u102c\u1038 frame \u1019\u103b\u102c\u1038\u104a 50-150kA \/ 630-1600A \u1021\u1010\u103d\u1000\u103a \u1000\u103c\u102e\u1038\u1019\u102c\u1038\u101e\u1031\u102c frame \u1019\u103b\u102c\u1038<\/li>\n<li><strong>Rating plate \u1019\u103b\u102c\u1038\u1000\u102d\u102f \u1002\u101b\u102f\u1010\u1005\u102d\u102f\u1000\u103a\u1016\u1010\u103a\u1015\u102b\u104b<\/strong>- \u1019\u1010\u1015\u103a\u1006\u1004\u103a\u1019\u102e In, Ue, Icu, Ics, poles \u1014\u103e\u1004\u1037\u103a \u1021\u101e\u102d\u1021\u1019\u103e\u1010\u103a\u1015\u103c\u102f\u101c\u1000\u103a\u1019\u103e\u1010\u103a\u1019\u103b\u102c\u1038\u1000\u102d\u102f \u1021\u1010\u100a\u103a\u1015\u103c\u102f\u1015\u102b\u104b<\/li>\n<li><strong>\u1005\u1014\u1005\u103a\u101c\u1031\u1037\u101c\u102c\u1019\u103e\u102f\u1019\u103b\u102c\u1038\u1014\u103e\u1004\u1037\u103a \u100a\u103e\u102d\u1014\u103e\u102d\u102f\u1004\u103a\u1038\u1015\u102b\u104b<\/strong>- \u1016\u103c\u1014\u1037\u103a\u1016\u103c\u1030\u1038\u101b\u1031\u1038\u1021\u1006\u1004\u1037\u103a\u1006\u1004\u1037\u103a\u1010\u103d\u1004\u103a \u101b\u103d\u1031\u1038\u1001\u103b\u101a\u103a\u1014\u102d\u102f\u1004\u103a\u1005\u103d\u1019\u103a\u1038\u1000\u102d\u102f \u101e\u1031\u1001\u103b\u102c\u1005\u1031\u101b\u1014\u103a time-current curves \u1019\u103b\u102c\u1038\u1000\u102d\u102f \u1021\u101e\u102f\u1036\u1038\u1015\u103c\u102f\u1015\u102b\u104b<\/li>\n<\/ul>\n<p>\u101e\u1004\u103a\u101e\u100a\u103a 63A Breaker \u1016\u103c\u1004\u1037\u103a 30kW \u1019\u1031\u102c\u103a\u1010\u102c\u1000\u102d\u102f \u1000\u102c\u1000\u103d\u101a\u103a\u1014\u1031\u101e\u100a\u103a\u1016\u103c\u1005\u103a\u1005\u1031 \u101e\u102d\u102f\u1037\u1019\u101f\u102f\u1010\u103a \u1005\u1000\u103a\u1019\u103e\u102f\u101c\u102f\u1015\u103a\u1004\u1014\u103a\u1038\u101e\u102f\u1036\u1038 \u1021\u1006\u1031\u102c\u1000\u103a\u1021\u1026\u1021\u1010\u103d\u1000\u103a 1600A \u1015\u1004\u103a\u1019\u101d\u1004\u103a\u1015\u1031\u102b\u1000\u103a\u1000\u102d\u102f \u101e\u1010\u103a\u1019\u103e\u1010\u103a\u1014\u1031\u101e\u100a\u103a\u1016\u103c\u1005\u103a\u1005\u1031\u104a \u1021\u1001\u103c\u1031\u1001\u1036\u1019\u1030\u1019\u103b\u102c\u1038\u101e\u100a\u103a \u1021\u1010\u1030\u1010\u1030\u1015\u1004\u103a\u1016\u103c\u1005\u103a\u101e\u100a\u103a- \u1010\u102d\u1000\u103b\u101e\u1031\u102c \u101d\u1014\u103a\u1010\u103d\u1000\u103a\u1001\u103b\u1000\u103a\u1019\u103e\u102f\u104a \u101e\u1004\u1037\u103a\u101c\u103b\u1031\u102c\u103a\u101e\u1031\u102c \u1016\u103c\u1010\u103a\u1010\u1031\u102c\u1000\u103a\u1014\u102d\u102f\u1004\u103a\u1005\u103d\u1019\u103a\u1038\u1014\u103e\u1004\u1037\u103a \u1021\u1010\u100a\u103a\u1015\u103c\u102f\u1011\u102c\u1038\u101e\u1031\u102c \u100a\u103e\u102d\u1014\u103e\u102d\u102f\u1004\u103a\u1038\u1019\u103e\u102f\u104b.<\/p>\n<hr \/>\n<p><strong>\u101e\u1004\u103a\u104f \u1015\u101b\u1031\u102c\u1002\u103b\u1000\u103a\u1021\u1010\u103d\u1000\u103a \u101e\u1004\u1037\u103a\u101c\u103b\u1031\u102c\u103a\u101e\u1031\u102c MCCB \u1000\u102d\u102f \u101b\u103d\u1031\u1038\u1001\u103b\u101a\u103a\u101b\u102c\u1010\u103d\u1004\u103a \u1021\u1000\u1030\u1021\u100a\u102e\u101c\u102d\u102f\u1015\u102b\u101e\u101c\u102c\u1038\u104b<\/strong> VIOX Electric \u101e\u100a\u103a 16A \u1019\u103e 1600A \u1021\u1011\u102d \u1005\u1036\u1014\u103e\u102f\u1014\u103a\u1038\u101e\u1010\u103a\u1019\u103e\u1010\u103a\u1001\u103b\u1000\u103a\u1021\u102c\u1038\u101c\u102f\u1036\u1038\u1010\u103d\u1004\u103a IEC 60947-2 \u1014\u103e\u1004\u1037\u103a \u1000\u102d\u102f\u1000\u103a\u100a\u102e\u101e\u1031\u102c MCCB \u1019\u103b\u102c\u1038\u1000\u102d\u102f \u1011\u102f\u1010\u103a\u101c\u102f\u1015\u103a\u1015\u102b\u101e\u100a\u103a\u104b \u1000\u103b\u103d\u1014\u103a\u102f\u1015\u103a\u1010\u102d\u102f\u1037\u104f \u1021\u1004\u103a\u1002\u103b\u1004\u103a\u1014\u102e\u101a\u102c\u1021\u1016\u103d\u1032\u1037\u101e\u100a\u103a Breaker \u101b\u103d\u1031\u1038\u1001\u103b\u101a\u103a\u1019\u103e\u102f\u104a \u100a\u103e\u102d\u1014\u103e\u102d\u102f\u1004\u103a\u1038\u1019\u103e\u102f \u101c\u1031\u1037\u101c\u102c\u1019\u103e\u102f\u1019\u103b\u102c\u1038\u1014\u103e\u1004\u1037\u103a \u1005\u1014\u1005\u103a\u1012\u102e\u1007\u102d\u102f\u1004\u103a\u1038\u1021\u1010\u103d\u1000\u103a \u1014\u100a\u103a\u1038\u1015\u100a\u102c\u1006\u102d\u102f\u1004\u103a\u101b\u102c \u1015\u1036\u1037\u1015\u102d\u102f\u1038\u1000\u1030\u100a\u102e\u1019\u103e\u102f\u1015\u1031\u1038\u1015\u102b\u101e\u100a\u103a\u104b. <a href=\"#\">\u101e\u1010\u103a\u1019\u103e\u1010\u103a\u1001\u103b\u1000\u103a\u1019\u103b\u102c\u1038\u1014\u103e\u1004\u1037\u103a \u1014\u100a\u103a\u1038\u1015\u100a\u102c\u1006\u102d\u102f\u1004\u103a\u101b\u102c \u1021\u1000\u103c\u1036\u1009\u102c\u100f\u103a\u1019\u103b\u102c\u1038\u1021\u1010\u103d\u1000\u103a \u1000\u103b\u103d\u1014\u103a\u102f\u1015\u103a\u1010\u102d\u102f\u1037\u1011\u1036 \u1006\u1000\u103a\u101e\u103d\u101a\u103a\u1015\u102b\u104b.<\/a><\/p>\n<\/div>","protected":false},"excerpt":{"rendered":"<p>Selecting the right molded case circuit breaker (MCCB) starts with understanding standard breaker sizes. Unlike miniature circuit breakers (MCBs) that protect final circuits, MCCBs cover a much wider current range\u2014from 16A branch feeders to 1600A main incomers\u2014and choosing the correct rating directly impacts system safety, coordination, and project costs. This guide maps the complete IEC [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":20574,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"inline_featured_image":false,"site-sidebar-layout":"default","site-content-layout":"","ast-site-content-layout":"default","site-content-style":"default","site-sidebar-style":"default","ast-global-header-display":"","ast-banner-title-visibility":"","ast-main-header-display":"","ast-hfb-above-header-display":"","ast-hfb-below-header-display":"","ast-hfb-mobile-header-display":"","site-post-title":"","ast-breadcrumbs-content":"","ast-featured-img":"","footer-sml-layout":"","ast-disable-related-posts":"","theme-transparent-header-meta":"","adv-header-id-meta":"","stick-header-meta":"","header-above-stick-meta":"","header-main-stick-meta":"","header-below-stick-meta":"","astra-migrate-meta-layouts":"set","ast-page-background-enabled":"default","ast-page-background-meta":{"desktop":{"background-color":"","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"tablet":{"background-color":"","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"mobile":{"background-color":"","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""}},"ast-content-background-meta":{"desktop":{"background-color":"var(--ast-global-color-5)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"tablet":{"background-color":"var(--ast-global-color-5)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"mobile":{"background-color":"var(--ast-global-color-5)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""}},"footnotes":""},"categories":[1],"tags":[],"class_list":["post-20573","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-blog"],"_links":{"self":[{"href":"https:\/\/test.viox.com\/my\/wp-json\/wp\/v2\/posts\/20573","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/test.viox.com\/my\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/test.viox.com\/my\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/test.viox.com\/my\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/test.viox.com\/my\/wp-json\/wp\/v2\/comments?post=20573"}],"version-history":[{"count":4,"href":"https:\/\/test.viox.com\/my\/wp-json\/wp\/v2\/posts\/20573\/revisions"}],"predecessor-version":[{"id":20578,"href":"https:\/\/test.viox.com\/my\/wp-json\/wp\/v2\/posts\/20573\/revisions\/20578"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/test.viox.com\/my\/wp-json\/wp\/v2\/media\/20574"}],"wp:attachment":[{"href":"https:\/\/test.viox.com\/my\/wp-json\/wp\/v2\/media?parent=20573"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/test.viox.com\/my\/wp-json\/wp\/v2\/categories?post=20573"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/test.viox.com\/my\/wp-json\/wp\/v2\/tags?post=20573"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}