{"id":20187,"date":"2025-11-17T14:30:20","date_gmt":"2025-11-17T06:30:20","guid":{"rendered":"https:\/\/viox.com\/?p=20187"},"modified":"2025-11-17T14:30:22","modified_gmt":"2025-11-17T06:30:22","slug":"mccb-vs-iccb-comprehensive-guide","status":"publish","type":"post","link":"https:\/\/test.viox.com\/vi\/mccb-vs-iccb-comprehensive-guide\/","title":{"rendered":"H\u01b0\u1edbng D\u1eabn K\u1ef9 Thu\u1eadt To\u00e0n Di\u1ec7n: MCCB so v\u1edbi ICCB"},"content":{"rendered":"<div class=\"product-intro\">\n<p><img fetchpriority=\"high\" decoding=\"async\" class=\"alignnone size-full wp-image-20192\" src=\"https:\/\/test.viox.com\/wp-content\/uploads\/2025\/11\/the-cascade-killer-lcw-rating-prevents-facility-wide-outages.webp\" alt=\"the cascade killer lcw rating prevents facility-wide outages\" width=\"800\" height=\"533\" srcset=\"https:\/\/test.viox.com\/wp-content\/uploads\/2025\/11\/the-cascade-killer-lcw-rating-prevents-facility-wide-outages.webp 800w, https:\/\/test.viox.com\/wp-content\/uploads\/2025\/11\/the-cascade-killer-lcw-rating-prevents-facility-wide-outages-300x200.webp 300w, https:\/\/test.viox.com\/wp-content\/uploads\/2025\/11\/the-cascade-killer-lcw-rating-prevents-facility-wide-outages-768x512.webp 768w, https:\/\/test.viox.com\/wp-content\/uploads\/2025\/11\/the-cascade-killer-lcw-rating-prevents-facility-wide-outages-18x12.webp 18w, https:\/\/test.viox.com\/wp-content\/uploads\/2025\/11\/the-cascade-killer-lcw-rating-prevents-facility-wide-outages-600x400.webp 600w\" sizes=\"(max-width: 800px) 100vw, 800px\" \/><\/p>\n<p>B\u1ea1n \u0111ang \u0111\u1eb7c t\u1ea3 c\u1ea7u dao t\u1ed5ng \u0111\u1ea7u v\u00e0o cho m\u1ed9t nh\u00e0 m\u00e1y s\u1ea3n xu\u1ea5t m\u1edbi c\u00f4ng su\u1ea5t 2MW. Ng\u00e2n s\u00e1ch cho ph\u00e9p d\u00f9ng MCCB\u2014ti\u1ebft ki\u1ec7m $7,000 so v\u1edbi ICCB. Linh c\u1ea3m m\u00e1ch b\u1ea3o c\u00f3 g\u00ec \u0111\u00f3 kh\u00f4ng \u1ed5n, nh\u01b0ng b\u1ea1n kh\u00f4ng th\u1ec3 ch\u1ec9 ra \u0111\u01b0\u1ee3c. B\u1ea1n k\u00fd duy\u1ec7t d\u00f9ng MCCB.<\/p>\n<p>S\u00e1u th\u00e1ng sau: 2:47 s\u00e1ng. M\u1ed9t k\u1ebft n\u1ed1i l\u1ecfng l\u1ebbo trong T\u1ee7 \u0111i\u1ec7n 3B b\u1ecb h\u1ed3 quang.<\/p>\n<p>Trong 83 mili gi\u00e2y, to\u00e0n b\u1ed9 nh\u00e0 m\u00e1y m\u1ea5t \u0111i\u1ec7n.<\/p>\n<p>Kh\u00f4ng ch\u1ec9 T\u1ee7 \u0111i\u1ec7n 3B. Kh\u00f4ng ch\u1ec9 h\u1ec7 th\u1ed1ng ph\u00e2n ph\u1ed1i nh\u00e1nh c\u1ea5p \u0111i\u1ec7n cho n\u00f3. <em>C\u1ea7u dao<\/em> MCCB t\u1ed5ng t\u00e1c \u0111\u1ed9ng, c\u1eaft \u0111i\u1ec7n to\u00e0n b\u1ed9 m\u00e1y m\u00f3c, m\u00e1y t\u00ednh, b\u1ed9 \u0111i\u1ec1u khi\u1ec3n quy tr\u00ecnh trong t\u00f2a nh\u00e0. \u0110\u1ebfn khi \u0111\u1ed9i b\u1ea3o tr\u00ec \u0111\u1ebfn l\u00fac 4:15 s\u00e1ng, s\u1ea3n xu\u1ea5t \u0111\u00e3 b\u1ecb d\u1eebng 90 ph\u00fat. \u0110\u1ebfn b\u00ecnh minh, b\u1ea1n \u0111ang \u0111\u1ed1i m\u1eb7t v\u1edbi $124,000 thi\u1ec7t h\u1ea1i do m\u1ea5t s\u1ea3n l\u01b0\u1ee3ng, l\u00e0m th\u00eam gi\u1edd kh\u1ea9n c\u1ea5p v\u00e0 ph\u1ebf li\u1ec7u v\u1eadt t\u01b0 \u0111ang s\u1ea3n xu\u1ea5t.<\/p>\n<p>Nguy\u00ean nh\u00e2n g\u1ed1c r\u1ec5? C\u1ea7u dao MCCB 1,200A c\u1ee7a b\u1ea1n \u0111\u00e3 l\u00e0m \u0111\u00fang ch\u1ee9c n\u0103ng \u0111\u01b0\u1ee3c thi\u1ebft k\u1ebf\u2014t\u00e1c \u0111\u1ed9ng t\u1ee9c th\u1eddi khi d\u00f2ng s\u1ef1 c\u1ed1 cao. \u0110\u00f3 l\u00e0 v\u1ea5n \u0111\u1ec1.<\/p>\n<p>N\u00f3 kh\u00f4ng c\u00f3 <strong>\u0111\u1ecbnh m\u1ee9c Icw<\/strong>\u2014kh\u00f4ng c\u00f3 kh\u1ea3 n\u0103ng \u201cch\u1edd v\u00e0 xem\u201d trong khi c\u1ea7u dao h\u1ea1 ngu\u1ed3n x\u1eed l\u00fd s\u1ef1 c\u1ed1 tr\u01b0\u1edbc. Ch\u00e0o m\u1eebng \u0111\u1ebfn v\u1edbi <strong>K\u1ebb Gi\u1ebft Ng\u01b0\u1eddi H\u00e0ng Lo\u1ea1t<\/strong> v\u1ea5n \u0111\u1ec1. Hay \u0111\u00fang h\u01a1n, s\u1ef1 thi\u1ebfu v\u1eafng n\u00f3.<\/p>\n<section id=\"real-difference\">\n<h2>S\u1ef1 Kh\u00e1c Bi\u1ec7t Th\u1ef1c S\u1ef1 Gi\u1eefa MCCB v\u00e0 ICCB (Kh\u00f4ng Ph\u1ea3i Kh\u1ea3 N\u0103ng C\u1eaft)<\/h2>\n<p>H\u1ecfi h\u1ea7u h\u1ebft c\u00e1c k\u1ef9 s\u01b0 v\u1ec1 MCCB so v\u1edbi ICCB, h\u1ecd s\u1ebd n\u00f3i v\u1edbi b\u1ea1n v\u1ec1 kh\u1ea3 n\u0103ng c\u1eaft\u2014\u0111\u1ecbnh m\u1ee9c Icu. \u201cMCCB l\u00ean \u0111\u1ebfn kh\u1ea3 n\u0103ng c\u1eaft 150kA, ICCB th\u1eadm ch\u00ed c\u00f2n cao h\u01a1n.\u201d \u0110\u1ee7 \u0111\u00fang. Nh\u01b0ng \u0111\u00f3 l\u00e0 th\u00f4ng s\u1ed1 sai \u0111\u1ec3 \u00e1m \u1ea3nh.<\/p>\n<p>Y\u1ebfu t\u1ed1 kh\u00e1c bi\u1ec7t th\u1ef1c s\u1ef1? <strong>D\u00f2ng \u0111i\u1ec7n ch\u1ecbu \u0111\u1ef1ng ng\u1eafn m\u1ea1ch (Icw).<\/strong><\/p>\n<p>\u0110\u00e2y l\u00e0 \u00fd ngh\u0129a c\u1ee7a n\u00f3.<\/p>\n<p>M\u1ed9t <a href=\"https:\/\/test.viox.com\/vi\/mccb\/\"><strong>MCCB (Molded Case Circuit Breaker - Aptomat v\u1ecf \u0111\u00fac)<\/strong><\/a> th\u01b0\u1eddng c\u00f3 kh\u1ea3 n\u0103ng c\u1eaft cu\u1ed1i c\u00f9ng cao\u2014n\u00f3 c\u00f3 th\u1ec3 c\u1eaft d\u00f2ng s\u1ef1 c\u1ed1 l\u1edbn m\u00e0 kh\u00f4ng ph\u00e1t n\u1ed5. Nh\u01b0ng n\u00f3 c\u00f3 r\u1ea5t \u00edt ho\u1eb7c kh\u00f4ng c\u00f3 \u0111\u1ecbnh m\u1ee9c Icw. Khi d\u00f2ng s\u1ef1 c\u1ed1 v\u01b0\u1ee3t qu\u00e1 c\u00e0i \u0111\u1eb7t t\u00e1c \u0111\u1ed9ng t\u1ee9c th\u1eddi c\u1ee7a n\u00f3, n\u00f3 <em>ph\u1ea3i<\/em> t\u00e1c \u0111\u1ed9ng ngay l\u1eadp t\u1ee9c. Kh\u00f4ng tr\u00ec ho\u00e3n. Kh\u00f4ng ch\u1edd xem c\u1ea7u dao h\u1ea1 ngu\u1ed3n c\u00f3 x\u1eed l\u00fd tr\u01b0\u1edbc hay kh\u00f4ng.<\/p>\n<p>M\u1ed9t <strong>ICCB (C\u1ea7u Dao V\u1ecf \u0110\u00fac C\u00e1ch \u0110i\u1ec7n)<\/strong> c\u0169ng c\u00f3 kh\u1ea3 n\u0103ng c\u1eaft cao. Nh\u01b0ng \u0111\u00e2y l\u00e0 y\u1ebfu t\u1ed1 thay \u0111\u1ed5i cu\u1ed9c ch\u01a1i: N\u00f3 c\u00f3 \u0111\u1ecbnh m\u1ee9c Icw \u0111\u00e1ng k\u1ec3\u2014kh\u1ea3 n\u0103ng ch\u1ecbu d\u00f2ng s\u1ef1 c\u1ed1 l\u1edbn trong m\u1ed9t kho\u1ea3ng th\u1eddi gian nh\u1ea5t \u0111\u1ecbnh (th\u01b0\u1eddng l\u00e0 0.05 \u0111\u1ebfn 1 gi\u00e2y) <em>m\u00e0 kh\u00f4ng t\u00e1c \u0111\u1ed9ng v\u00e0 kh\u00f4ng b\u1ecb h\u01b0 h\u1ea1i<\/em>. H\u00e3y ngh\u0129 v\u1ec1 n\u00f3 nh\u01b0 kh\u1ea3 n\u0103ng c\u1ea7u dao n\u00edn th\u1edf d\u01b0\u1edbi n\u01b0\u1edbc trong khi c\u1ea7u dao h\u1ea1 ngu\u1ed3n th\u1ef1c hi\u1ec7n c\u00f4ng vi\u1ec7c c\u1ee7a n\u00f3.<\/p>\n<p>Theo IEC 60947-2:2024\u2014ti\u00eau chu\u1ea9n chi ph\u1ed1i c\u1ea7u dao h\u1ea1 th\u1ebf\u2014th\u1ebf gi\u1edbi c\u1ea7u dao chia th\u00e0nh hai phe:<\/p>\n<ul>\n<li><strong>Lo\u1ea1i A:<\/strong> Kh\u00f4ng c\u00f3 \u0111\u1ed9 tr\u1ec5 ng\u1eafn m\u1ea1ch c\u1ed1 \u00fd. Ph\u1ea3i t\u00e1c \u0111\u1ed9ng nhanh. MCCB thu\u1ed9c v\u1ec1 phe n\u00e0y.<\/li>\n<li><strong>Lo\u1ea1i B:<\/strong> \u0110\u01b0\u1ee3c thi\u1ebft k\u1ebf \u0111\u1ec3 ch\u1ecdn l\u1ecdc v\u1edbi kh\u1ea3 n\u0103ng ch\u1ecbu \u0111\u1ef1ng ng\u1eafn m\u1ea1ch c\u00f3 ch\u1ee7 \u00fd. ICCB v\u00e0 <a href=\"https:\/\/test.viox.com\/vi\/complete-guide-to-air-circuit-breakers-acb\/\">M\u00e1y B\u1ed9 Ng\u1eaft M\u1ea1ch (ACBs)<\/a> thu\u1ed9c v\u1ec1 phe n\u00e0y.<\/li>\n<\/ul>\n<p>T\u1ea1i sao \u0111i\u1ec1u n\u00e0y l\u1ea1i quan tr\u1ecdng? B\u1edfi v\u00ec n\u1ebfu kh\u00f4ng c\u00f3 \u0111\u1ecbnh m\u1ee9c Icw, b\u1ea1n kh\u00f4ng th\u1ec3 c\u00f3 t\u00ednh ch\u1ecdn l\u1ecdc th\u1ef1c s\u1ef1. V\u00e0 n\u1ebfu kh\u00f4ng c\u00f3 t\u00ednh ch\u1ecdn l\u1ecdc, m\u1ed9t s\u1ef1 c\u1ed1 \u1edf b\u1ea5t k\u1ef3 \u0111\u00e2u trong c\u01a1 s\u1edf c\u1ee7a b\u1ea1n c\u00f3 th\u1ec3 l\u00e0m t\u00e1c \u0111\u1ed9ng c\u1ea7u dao t\u1ed5ng c\u1ee7a b\u1ea1n.<\/p>\n<p>H\u00e3y \u0111\u1ec3 t\u00f4i v\u1ebd cho b\u1ea1n m\u1ed9t b\u1ee9c tranh.<\/p>\n<p>C\u1ea7u dao t\u1ed5ng \u0111\u1ea7u v\u00e0o ICCB c\u1ee7a b\u1ea1n \u0111\u01b0\u1ee3c \u0111\u1ecbnh m\u1ee9c \u1edf 630A li\u00ean t\u1ee5c, v\u1edbi Icw l\u00e0 42kA trong 0.1 gi\u00e2y. M\u1ed9t s\u1ef1 c\u1ed1 x\u1ea3y ra tr\u00ean m\u1ed9t m\u1ea1ch nh\u00e1nh h\u1ea1 ngu\u1ed3n, t\u1ea1o ra d\u00f2ng ng\u1eafn m\u1ea1ch 18kA. MCCB nh\u00e1nh ph\u00e1t hi\u1ec7n s\u1ef1 c\u1ed1 v\u00e0 t\u00e1c \u0111\u1ed9ng trong 45 mili gi\u00e2y\u2014n\u1eb1m trong kho\u1ea3ng th\u1eddi gian ch\u1edd v\u00e0 xem 0.1 gi\u00e2y c\u1ee7a ICCB. ICCB ch\u1ecbu d\u00f2ng 18kA \u0111\u00f3 trong 45ms m\u00e0 kh\u00f4ng c\u00f3 v\u1ea5n \u0111\u1ec1 g\u00ec, v\u1eabn \u0111\u00f3ng, v\u00e0 c\u01a1 s\u1edf c\u1ee7a b\u1ea1n v\u1eabn c\u00f3 \u0111i\u1ec7n ngo\u1ea1i tr\u1eeb m\u1ea1ch b\u1ecb s\u1ef1 c\u1ed1. \u0110\u00f3 l\u00e0 <strong>K\u1ebb Gi\u1ebft Ng\u01b0\u1eddi H\u00e0ng Lo\u1ea1t<\/strong> \u0111ang ho\u1ea1t \u0111\u1ed9ng\u2014\u0111\u1ecbnh m\u1ee9c Icw ng\u0103n ng\u1eeba s\u1ef1 c\u1ed1 h\u00e0ng lo\u1ea1t.<\/p>\n<p>B\u00e2y gi\u1edd h\u00e3y thay ICCB \u0111\u00f3 b\u1eb1ng MCCB \u1edf v\u1ecb tr\u00ed t\u1ed5ng. C\u00f9ng m\u1ed9t s\u1ef1 c\u1ed1 18kA tr\u00ean nh\u00e1nh. C\u1ea7u dao nh\u00e1nh v\u1eabn \u0111ang c\u1ed1 g\u1eafng x\u1eed l\u00fd n\u00f3 \u1edf 45ms. Nh\u01b0ng MCCB t\u1ed5ng c\u1ee7a b\u1ea1n, kh\u00f4ng c\u00f3 \u0111\u1ecbnh m\u1ee9c Icw v\u00e0 kh\u00f4ng c\u00f3 \u0111\u1ed9 tr\u1ec5 th\u1eddi gian, th\u1ea5y 18kA, quy\u1ebft \u0111\u1ecbnh r\u1eb1ng n\u00f3 v\u01b0\u1ee3t qu\u00e1 ng\u01b0\u1ee1ng t\u00e1c \u0111\u1ed9ng t\u1ee9c th\u1eddi c\u1ee7a n\u00f3, v\u00e0 t\u00e1c \u0111\u1ed9ng trong 12 mili gi\u00e2y. To\u00e0n b\u1ed9 c\u01a1 s\u1edf m\u1ea5t \u0111i\u1ec7n. C\u1ea7u dao nh\u00e1nh kh\u00f4ng bao gi\u1edd c\u00f3 c\u01a1 h\u1ed9i.<\/p>\n<p><strong>\u0110\u00f3 l\u00e0 s\u1ef1 kh\u00e1c bi\u1ec7t khi\u1ebfn b\u1ea1n m\u1ea5t $124,000.<\/strong><\/p>\n<\/section>\n<section id=\"cascade-problem\">\n<h2>T\u1ea1i Sao MCCB T\u1ea1o Ra S\u1ef1 C\u1ed1 H\u00e0ng Lo\u1ea1t (C\u00e1i B\u1eaby T\u00e1c \u0110\u1ed9ng T\u1ee9c Th\u1eddi)<\/h2>\n<p>\u0110\u00e2y l\u00e0 ngh\u1ecbch l\u00fd m\u00e0 c\u00e1c k\u1ef9 s\u01b0 ph\u1ea3i \u0111\u1ed1i m\u1eb7t: T\u1ed1c \u0111\u1ed9 th\u01b0\u1eddng t\u1ed1t trong b\u1ea3o v\u1ec7 m\u1ea1ch. B\u1ea1n x\u1eed l\u00fd s\u1ef1 c\u1ed1 c\u00e0ng nhanh, thi\u1ebft b\u1ecb c\u00e0ng \u00edt b\u1ecb h\u01b0 h\u1ea1i, c\u00e0ng an to\u00e0n cho nh\u00e2n vi\u00ean. MCCB v\u01b0\u1ee3t tr\u1ed9i \u1edf \u0111i\u1ec3m n\u00e0y\u2014ch\u00fang \u0111\u01b0\u1ee3c thi\u1ebft k\u1ebf \u0111\u1ec3 t\u00e1c \u0111\u1ed9ng <em>nhanh<\/em> khi s\u1ef1 c\u1ed1 x\u1ea3y ra.<\/p>\n<p>Nh\u01b0ng t\u1ed1c \u0111\u1ed9 tr\u1edf th\u00e0nh m\u1ed9t b\u1ea5t l\u1ee3i khi b\u1ea1n \u1edf tr\u00ean \u0111\u1ec9nh c\u1ee7a h\u1ec7 th\u1ed1ng ph\u00e2n ph\u1ed1i.<\/p>\n<p>\u0110\u00e2y l\u00e0 <strong>C\u00e1i B\u1eaby T\u00e1c \u0110\u1ed9ng T\u1ee9c Th\u1eddi<\/strong>: MCCB c\u1ee7a b\u1ea1n \u0111ang l\u00e0m \u0111\u00fang ch\u1ee9c n\u0103ng \u0111\u01b0\u1ee3c thi\u1ebft k\u1ebf\u2014b\u1ea3o v\u1ec7 ch\u1ed1ng l\u1ea1i d\u00f2ng s\u1ef1 c\u1ed1 cao b\u1eb1ng c\u00e1ch m\u1edf ngay l\u1eadp t\u1ee9c. Th\u1eadt kh\u00f4ng may, \u0111i\u1ec1u \u0111\u00f3 c\u00f3 ngh\u0129a l\u00e0 n\u00f3 kh\u00f4ng th\u1ec3 ph\u00e2n bi\u1ec7t gi\u1eefa \u201c\u0111\u00e2y l\u00e0 s\u1ef1 c\u1ed1 c\u1ee7a t\u00f4i \u0111\u1ec3 x\u1eed l\u00fd\u201d v\u00e0 \u201cthi\u1ebft b\u1ecb h\u1ea1 ngu\u1ed3n n\u00ean x\u1eed l\u00fd vi\u1ec7c n\u00e0y.\u201d N\u00f3 th\u1ea5y d\u00f2ng \u0111i\u1ec7n cao, n\u00f3 t\u00e1c \u0111\u1ed9ng. Kh\u00f4ng h\u1ecfi g\u00ec c\u1ea3.<\/p>\n<p>C\u00e1c con s\u1ed1 k\u1ec3 c\u00e2u chuy\u1ec7n. Trong v\u00ed d\u1ee5 tr\u01b0\u1edbc c\u1ee7a ch\u00fang ta, MCCB t\u1ed5ng t\u00e1c \u0111\u1ed9ng trong 12 mili gi\u00e2y. MCCB nh\u00e1nh h\u1ea1 ngu\u1ed3n c\u1ea7n 45 mili gi\u00e2y \u0111\u1ec3 x\u1eed l\u00fd s\u1ef1 c\u1ed1. C\u1ea7u dao t\u1ed5ng \u0111\u00e3 th\u1eafng cu\u1ed9c \u0111ua\u2014v\u00e0 to\u00e0n b\u1ed9 c\u01a1 s\u1edf c\u1ee7a b\u1ea1n b\u1ecb m\u1ea5t \u0111i\u1ec7n do \u0111\u00f3.<\/p>\n<p>B\u1ea1n kh\u00f4ng th\u1ec3 ph\u1ed1i h\u1ee3p nh\u1eefng g\u00ec b\u1ea1n kh\u00f4ng th\u1ec3 tr\u00ec ho\u00e3n.<\/p>\n<p><img decoding=\"async\" class=\"alignnone size-full wp-image-20194\" src=\"https:\/\/test.viox.com\/wp-content\/uploads\/2025\/11\/Electrical-Protection-System-Analysis.webp\" alt=\"Electrical Protection System Analysis\" width=\"820\" height=\"700\" srcset=\"https:\/\/test.viox.com\/wp-content\/uploads\/2025\/11\/Electrical-Protection-System-Analysis.webp 820w, https:\/\/test.viox.com\/wp-content\/uploads\/2025\/11\/Electrical-Protection-System-Analysis-300x256.webp 300w, https:\/\/test.viox.com\/wp-content\/uploads\/2025\/11\/Electrical-Protection-System-Analysis-768x656.webp 768w, https:\/\/test.viox.com\/wp-content\/uploads\/2025\/11\/Electrical-Protection-System-Analysis-14x12.webp 14w, https:\/\/test.viox.com\/wp-content\/uploads\/2025\/11\/Electrical-Protection-System-Analysis-600x512.webp 600w\" sizes=\"(max-width: 820px) 100vw, 820px\" \/><\/p>\n<p>IEC 60947-2:2024 nh\u1eadn ra gi\u1edbi h\u1ea1n n\u00e0y m\u1ed9t c\u00e1ch r\u00f5 r\u00e0ng. MCCB \u0111\u01b0\u1ee3c ph\u00e2n lo\u1ea1i l\u00e0 thi\u1ebft b\u1ecb Lo\u1ea1i A: \u201cc\u1ea7u dao kh\u00f4ng \u0111\u01b0\u1ee3c thi\u1ebft k\u1ebf \u0111\u1eb7c bi\u1ec7t \u0111\u1ec3 ch\u1ecdn l\u1ecdc trong \u0111i\u1ec1u ki\u1ec7n ng\u1eafn m\u1ea1ch.\u201d Ti\u00eau chu\u1ea9n \u0111ang n\u00f3i v\u1edbi b\u1ea1n, b\u1eb1ng ng\u00f4n ng\u1eef ch\u00ednh th\u1ee9c, r\u1eb1ng MCCB \u1edf v\u1ecb tr\u00ed t\u1ed5ng l\u00e0 m\u1ed9t r\u1ee7i ro ph\u1ed1i h\u1ee3p.<\/p>\n<p>ICCB gi\u1ea3i quy\u1ebft v\u1ea5n \u0111\u1ec1 n\u00e0y b\u1eb1ng <strong>C\u1eeda S\u1ed5 Ch\u1edd v\u00e0 Xem<\/strong>\u2014\u0111\u1ed9 tr\u1ec5 th\u1eddi gian \u0111\u01b0\u1ee3c k\u00edch ho\u1ea1t b\u1edfi Icw \u0111\u00f3. M\u1ed9t ICCB \u0111i\u1ec3n h\u00ecnh c\u00f3 th\u1ec3 c\u00f3 \u0111\u1ecbnh m\u1ee9c Icw l\u00e0 42kA trong 0.1 gi\u00e2y, ho\u1eb7c 50kA trong 0.5 gi\u00e2y. Trong kho\u1ea3ng th\u1eddi gian \u0111\u00f3, ICCB c\u00f3 th\u1ec3 ch\u1ecbu d\u00f2ng s\u1ef1 c\u1ed1 m\u00e0 kh\u00f4ng t\u00e1c \u0111\u1ed9ng, cho c\u1ea7u dao h\u1ea1 ngu\u1ed3n th\u1eddi gian \u0111\u1ec3 h\u00e0nh \u0111\u1ed9ng. C\u00e1c <a href=\"https:\/\/test.viox.com\/vi\/stop-wiring-failures-the-engineers-guide-to-dry-vs-wet-contacts\/\">Ti\u1ebfp \u0111i\u1ec3m<\/a> kh\u00f4ng b\u1ecb h\u00e0n, v\u1ecf kh\u00f4ng b\u1ecb n\u1ee9t, thanh c\u00e1i kh\u00f4ng b\u1ecb qu\u00e1 nhi\u1ec7t\u2014n\u00f3 \u0111\u01b0\u1ee3c thi\u1ebft k\u1ebf \u0111\u1ec3 ch\u1ecbu \u0111\u01b0\u1ee3c c\u1ea3 \u1ee9ng su\u1ea5t nhi\u1ec7t v\u00e0 l\u1ef1c \u0111i\u1ec7n t\u1eeb c\u1ee7a d\u00f2ng \u0111i\u1ec7n t\u0103ng v\u1ecdt l\u1edbn \u0111\u00f3.<\/p>\n<p>H\u00e3y c\u1ee5 th\u1ec3 v\u1ec1 \u00fd ngh\u0129a c\u1ee7a \u201cch\u1ecbu \u0111\u1ef1ng\u201d. Khi 42,000 ampe ch\u1ea1y qua c\u00e1c ti\u1ebfp \u0111i\u1ec3m \u0111\u01b0\u1ee3c thi\u1ebft k\u1ebf cho ho\u1ea1t \u0111\u1ed9ng li\u00ean t\u1ee5c 630A, l\u1ef1c \u0111i\u1ec7n t\u1eeb l\u00e0 r\u1ea5t l\u1edbn\u2014h\u00e3y t\u01b0\u1edfng t\u01b0\u1ee3ng c\u1ed1 g\u1eafng gi\u1eef hai nam ch\u00e2m m\u1ea1nh t\u00e1ch r\u1eddi trong khi ch\u00fang \u0111ang c\u1ed1 g\u1eafng va v\u00e0o nhau. T\u1ea3i nhi\u1ec7t r\u1ea5t l\u1edbn\u2014d\u00f2ng \u0111i\u1ec7n l\u1edbn nh\u01b0 v\u1eady t\u1ea1o ra nhi\u1ec7t nghi\u00eam tr\u1ecdng ngay c\u1ea3 trong 0.1 gi\u00e2y. C\u1ea5u tr\u00fac c\u01a1 h\u1ecdc, c\u01a1 ch\u1ebf ho\u1ea1t \u0111\u1ed9ng t\u00edch tr\u1eef n\u0103ng l\u01b0\u1ee3ng v\u00e0 thi\u1ebft k\u1ebf ti\u1ebfp \u0111i\u1ec3m m\u1ea1nh m\u1ebd c\u1ee7a ICCB \u0111\u1ec1u \u0111\u01b0\u1ee3c thi\u1ebft k\u1ebf \u0111\u1ec3 t\u1ed3n t\u1ea1i s\u1ef1 l\u1ea1m d\u1ee5ng n\u00e0y. M\u1ed9t MCCB? C\u00e1c ti\u1ebfp \u0111i\u1ec3m c\u1ee7a n\u00f3 s\u1ebd b\u1ecb h\u00e0n, c\u01a1 ch\u1ebf t\u00e1c \u0111\u1ed9ng c\u1ee7a n\u00f3 s\u1ebd b\u1ecb h\u1ecfng, ho\u1eb7c \u00edt nh\u1ea5t n\u00f3 s\u1ebd t\u00e1c \u0111\u1ed9ng \u0111\u1ec3 t\u1ef1 b\u1ea3o v\u1ec7.<\/p>\n<p>Trong k\u1ecbch b\u1ea3n s\u1ef1 c\u1ed1 h\u00e0ng lo\u1ea1t c\u1ee7a ch\u00fang ta, \u0111\u00e2y l\u00e0 h\u00ecnh \u1ea3nh c\u1ee7a s\u1ef1 ch\u1ecdn l\u1ecdc th\u00edch h\u1ee3p:<\/p>\n<ul>\n<li><strong>Th\u1eddi gian 0ms:<\/strong> S\u1ef1 c\u1ed1 x\u1ea3y ra trong T\u1ee7 \u0111i\u1ec7n 3B. D\u00f2ng ng\u1eafn m\u1ea1ch: 18kA.<\/li>\n<li><strong>Th\u1eddi gian 12ms:<\/strong> MCCB nh\u00e1nh trong T\u1ee7 \u0111i\u1ec7n 3B b\u1eaft \u0111\u1ea7u m\u1edf c\u00e1c ti\u1ebfp \u0111i\u1ec3m c\u1ee7a n\u00f3.<\/li>\n<li><strong>Th\u1eddi gian 45ms:<\/strong> MCCB nh\u00e1nh x\u1eed l\u00fd ho\u00e0n to\u00e0n s\u1ef1 c\u1ed1. D\u00f2ng \u0111i\u1ec7n tr\u1edf v\u1ec1 kh\u00f4ng.<\/li>\n<li><strong>ICCB t\u1ed5ng:<\/strong> Ch\u1ecbu d\u00f2ng 18kA trong 45ms (d\u01b0\u1edbi \u0111\u1ecbnh m\u1ee9c 0.1s, 42kA c\u1ee7a n\u00f3). Kh\u00f4ng bao gi\u1edd t\u00e1c \u0111\u1ed9ng. C\u01a1 s\u1edf v\u1eabn c\u00f3 \u0111i\u1ec7n.<\/li>\n<\/ul>\n<p>\u0110\u00f3 l\u00e0 s\u1ef1 ph\u1ed1i h\u1ee3p. \u0110\u00f3 l\u00e0 nh\u1eefng g\u00ec $7,000 mang l\u1ea1i cho b\u1ea1n.<\/p>\n<\/section>\n<section id=\"technical-comparison\">\n<h2>MCCB so v\u1edbi ICCB: So S\u00e1nh K\u1ef9 Thu\u1eadt Ho\u00e0n Ch\u1ec9nh<\/h2>\n<p>H\u00e3y ph\u00e2n t\u00edch m\u1ecdi kh\u00eda c\u1ea1nh k\u1ef9 thu\u1eadt m\u00e0 c\u00e1c c\u1ea7u dao n\u00e0y kh\u00e1c nhau\u2014v\u00e0 t\u1ea1i sao nh\u1eefng kh\u00e1c bi\u1ec7t \u0111\u00f3 l\u1ea1i quan tr\u1ecdng \u0111\u1ed1i v\u1edbi \u1ee9ng d\u1ee5ng c\u1ee7a b\u1ea1n.<\/p>\n<p><img decoding=\"async\" class=\"alignnone size-full wp-image-20195\" src=\"https:\/\/test.viox.com\/wp-content\/uploads\/2025\/11\/CIRCUIT-BREAKER-COMPARAISON.webp\" alt=\"CIRCUIT BREAKER COMPARAISON\" width=\"832\" height=\"1248\" srcset=\"https:\/\/test.viox.com\/wp-content\/uploads\/2025\/11\/CIRCUIT-BREAKER-COMPARAISON.webp 832w, https:\/\/test.viox.com\/wp-content\/uploads\/2025\/11\/CIRCUIT-BREAKER-COMPARAISON-200x300.webp 200w, https:\/\/test.viox.com\/wp-content\/uploads\/2025\/11\/CIRCUIT-BREAKER-COMPARAISON-683x1024.webp 683w, https:\/\/test.viox.com\/wp-content\/uploads\/2025\/11\/CIRCUIT-BREAKER-COMPARAISON-768x1152.webp 768w, https:\/\/test.viox.com\/wp-content\/uploads\/2025\/11\/CIRCUIT-BREAKER-COMPARAISON-8x12.webp 8w, https:\/\/test.viox.com\/wp-content\/uploads\/2025\/11\/CIRCUIT-BREAKER-COMPARAISON-600x900.webp 600w\" sizes=\"(max-width: 832px) 100vw, 832px\" \/><\/p>\n<h3>C\u1ea5u Tr\u00fac v\u00e0 Tri\u1ebft L\u00fd Thi\u1ebft K\u1ebf<\/h3>\n<p><strong>MCCBs<\/strong> \u0111\u01b0\u1ee3c ch\u1ebf t\u1ea1o nh\u01b0 nh\u1eefng chi\u1ebfc xe t\u0103ng k\u00edn. To\u00e0n b\u1ed9 c\u01a1 ch\u1ebf ho\u1ea1t \u0111\u1ed9ng\u2014ti\u1ebfp \u0111i\u1ec3m, bu\u1ed3ng d\u1eadp h\u1ed3 quang, b\u1ed9 t\u00e1c \u0111\u1ed9ng v\u00e0 c\u00e1c li\u00ean k\u1ebft\u2014n\u1eb1m b\u00ean trong v\u1ecf nh\u1ef1a ho\u1eb7c nh\u1ef1a \u0111\u00fac. Sau khi \u0111\u01b0\u1ee3c s\u1ea3n xu\u1ea5t, c\u1ea7u dao v\u1ec1 c\u01a1 b\u1ea3n l\u00e0 kh\u00f4ng th\u1ec3 b\u1ea3o tr\u00ec. N\u1ebfu b\u1ed9 t\u00e1c \u0111\u1ed9ng b\u1ecb h\u1ecfng, ho\u1eb7c n\u1ebfu ti\u1ebfp \u0111i\u1ec3m b\u1ecb m\u00f2n, b\u1ea1n s\u1ebd thay th\u1ebf to\u00e0n b\u1ed9 thi\u1ebft b\u1ecb. \u0110i\u1ec1u n\u00e0y gi\u00fap gi\u1ea3m chi ph\u00ed v\u00e0 l\u00e0m cho vi\u1ec7c l\u1eafp \u0111\u1eb7t tr\u1edf n\u00ean \u0111\u01a1n gi\u1ea3n. \u0110\u1ed1i v\u1edbi MCCB 400A, b\u1ea1n s\u1ebd ph\u1ea3i chi t\u1eeb $800 \u0111\u1ebfn $1,500. K\u00edch th\u01b0\u1edbc nh\u1ecf g\u1ecdn l\u00e0 m\u1ed9t l\u1ee3i th\u1ebf l\u1edbn trong c\u00e1c t\u1ee7 \u0111i\u1ec7n b\u1ecb h\u1ea1n ch\u1ebf v\u1ec1 kh\u00f4ng gian.<\/p>\n<p><strong>ICCB<\/strong> c\u00f3 m\u1ed9t c\u00e1ch ti\u1ebfp c\u1eadn kh\u00e1c. Ch\u00fang \u0111\u01b0\u1ee3c c\u1ea5u t\u1ea1o v\u1edbi m\u1ed9t thi\u1ebft k\u1ebf m\u00f4-\u0111un m\u1ea1nh m\u1ebd b\u00ean trong m\u1ed9t v\u1ecf b\u1ecdc c\u00e1ch \u0111i\u1ec7n ch\u1eafc ch\u1eafn. T\u00ednh n\u0103ng ch\u00ednh l\u00e0 c\u01a1 ch\u1ebf t\u00edch tr\u1eef n\u0103ng l\u01b0\u1ee3ng hai b\u01b0\u1edbc\u2014m\u1ed9t h\u1ec7 th\u1ed1ng t\u00edch \u0111i\u1ec7n l\u00f2 xo cung c\u1ea5p kh\u1ea3 n\u0103ng t\u00e1ch ti\u1ebfp \u0111i\u1ec3m nhanh ch\u00f3ng, m\u1ea1nh m\u1ebd ngay c\u1ea3 trong \u0111i\u1ec1u ki\u1ec7n s\u1ef1 c\u1ed1 cao. C\u00e1c ti\u1ebfp \u0111i\u1ec3m, b\u1ed9 t\u00e1c \u0111\u1ed9ng v\u00e0 m\u1ed9t s\u1ed1 th\u00e0nh ph\u1ea7n c\u01a1 kh\u00ed c\u00f3 th\u1ec3 thay th\u1ebf t\u1ea1i ch\u1ed7. \u0110\u1ed1i v\u1edbi m\u1ed9t ICCB 630A t\u01b0\u01a1ng \u0111\u01b0\u01a1ng, ban \u0111\u1ea7u b\u1ea1n s\u1ebd ph\u1ea3i chi t\u1eeb $7,000 \u0111\u1ebfn $12,000. Nh\u01b0ng khi b\u1ed9 t\u00e1c \u0111\u1ed9ng \u0111i\u1ec7n t\u1eed c\u1ea7n thay th\u1ebf sau 15 n\u0103m? \u0110\u00f3 l\u00e0 thay th\u1ebf b\u1ed9 t\u00e1c \u0111\u1ed9ng $2,000 thay v\u00ec thay th\u1ebf c\u1ea7u dao $10,000. K\u00edch th\u01b0\u1edbc v\u1eadt l\u00fd l\u1edbn h\u01a1n \u0111\u00e1ng k\u1ec3\u2014\u0111\u00e2y l\u00e0 c\u00e1c thi\u1ebft b\u1ecb thu\u1ed9c lo\u1ea1i t\u1ee7 \u0111i\u1ec7n.<\/p>\n<p>N\u1ebfu b\u1ea1n t\u00ednh \u0111\u1ebfn chi ph\u00ed v\u00f2ng \u0111\u1eddi, l\u1ee3i th\u1ebf v\u1ec1 kh\u1ea3 n\u0103ng b\u1ea3o tr\u00ec c\u1ee7a ICCB tr\u1edf n\u00ean \u0111\u00e1ng k\u1ec3. Gi\u1ea3 s\u1eed b\u1ea1n c\u00f3 m\u1ed9t ngu\u1ed3n c\u1ea5p ch\u00ednh quan tr\u1ecdng ho\u1ea1t \u0111\u1ed9ng trong 25 n\u0103m. MCCB c\u00f3 th\u1ec3 c\u1ea7n thay th\u1ebf ho\u00e0n to\u00e0n m\u1ed9t l\u1ea7n (1.500 \u0111\u00f4 la) v\u00e0o gi\u1eefa v\u00f2ng \u0111\u1eddi do m\u00f2n ti\u1ebfp \u0111i\u1ec3m. ICCB c\u00f3 th\u1ec3 c\u1ea7n thay th\u1ebf m\u1ed9t b\u1ed9 ph\u1eadn b\u1ea3o v\u1ec7 (2.000 \u0111\u00f4 la) v\u00e0 m\u1ed9t b\u1ed9 ti\u1ebfp \u0111i\u1ec3m (1.200 \u0111\u00f4 la). Ch\u00eanh l\u1ec7ch chi ph\u00ed ban \u0111\u1ea7u: 8.000 \u0111\u00f4 la. Ch\u00eanh l\u1ec7ch chi ph\u00ed b\u1ea3o tr\u00ec v\u00f2ng \u0111\u1eddi: 1.700 \u0111\u00f4 la. Trong 25 n\u0103m, kho\u1ea3ng c\u00e1ch thu h\u1eb9p l\u1ea1i.<\/p>\n<p>Nh\u01b0ng \u0111\u00e2y l\u00e0 \u0111i\u1ec1u b\u1ea1n kh\u00f4ng th\u1ec3 \u0111\u1ecbnh gi\u00e1: Khi b\u1ed9 ng\u1eaft m\u1ea1ch ch\u00ednh ICCB c\u1ee7a b\u1ea1n b\u1ecb l\u1ed7i b\u1ed9 ph\u1eadn b\u1ea3o v\u1ec7, b\u1ea1n thay th\u1ebf b\u1ed9 ph\u1eadn b\u1ea3o v\u1ec7 trong kho\u1ea3ng th\u1eddi gian b\u1ea3o tr\u00ec theo l\u1ecbch tr\u00ecnh\u2014c\u00f3 th\u1ec3 m\u1ea5t 2 gi\u1edd ng\u1eebng ho\u1ea1t \u0111\u1ed9ng. Khi b\u1ed9 ng\u1eaft m\u1ea1ch ch\u00ednh MCCB c\u1ee7a b\u1ea1n b\u1ecb h\u1ecfng? B\u1ea1n \u0111ang xem x\u00e9t vi\u1ec7c mua s\u1eafm kh\u1ea9n c\u1ea5p, v\u1eadn chuy\u1ec3n nhanh (n\u1ebfu b\u1ea1n may m\u1eafn) v\u00e0 ng\u1eebng ho\u1ea1t \u0111\u1ed9ng ngo\u00e0i k\u1ebf ho\u1ea1ch c\u00f3 th\u1ec3 k\u00e9o d\u00e0i 8-24 gi\u1edd t\u00f9y thu\u1ed9c v\u00e0o h\u00e0ng t\u1ed3n kho c\u1ee7a nh\u00e0 ph\u00e2n ph\u1ed1i. \u0110\u00f3 l\u00e0 <strong>Thu\u1ebf ch\u1ecdn l\u1ecdc<\/strong> xu\u1ea5t hi\u1ec7n \u1edf m\u1ed9t d\u1ea1ng kh\u00e1c\u2014chi ph\u00ed \u1ea9n c\u1ee7a thi\u1ebft b\u1ecb kh\u00f4ng th\u1ec3 b\u1ea3o tr\u00ec \u1edf c\u00e1c v\u1ecb tr\u00ed quan tr\u1ecdng.<\/p>\n<h3>\u0110\u1ecbnh m\u1ee9c Icw: B\u1ea3o hi\u1ec3m ch\u1ecdn l\u1ecdc c\u1ee7a b\u1ea1n<\/h3>\n<p>\u0110\u00e2y l\u00e0 n\u01a1i ICCB ki\u1ebfm \u0111\u01b0\u1ee3c ph\u00ed b\u1ea3o hi\u1ec3m c\u1ee7a ch\u00fang.<\/p>\n<p>MCCB, v\u1edbi t\u01b0 c\u00e1ch l\u00e0 thi\u1ebft b\u1ecb Lo\u1ea1i A theo ti\u00eau chu\u1ea9n IEC 60947-2:2024, kh\u00f4ng c\u00f3 \u0111\u1ecbnh m\u1ee9c Icw \u0111\u01b0\u1ee3c c\u00f4ng b\u1ed1. M\u1ed9t s\u1ed1 MCCB khung l\u1edbn h\u01a1n (tr\u00ean 1000A) c\u00f3 th\u1ec3 c\u00f3 kh\u1ea3 n\u0103ng ch\u1ecbu \u0111\u1ef1ng ng\u1eafn h\u1ea1n h\u1ea1n ch\u1ebf, nh\u01b0ng \u0111\u00f3 kh\u00f4ng ph\u1ea3i l\u00e0 th\u00f4ng s\u1ed1 \u0111\u01b0\u1ee3c \u0111\u1ecbnh m\u1ee9c, th\u1eed nghi\u1ec7m ho\u1eb7c \u0111\u1ea3m b\u1ea3o. \u0110\u1ed1i v\u1edbi h\u1ea7u h\u1ebft c\u00e1c MCCB l\u00ean \u0111\u1ebfn 630A, Icw th\u1ef1c t\u1ebf b\u1eb1ng kh\u00f4ng\u2014ch\u00fang ph\u1ea3i ng\u1eaft ngay l\u1eadp t\u1ee9c khi d\u00f2ng \u0111i\u1ec7n ng\u1eafn m\u1ea1ch v\u01b0\u1ee3t qu\u00e1 c\u00e0i \u0111\u1eb7t t\u1ee9c th\u1eddi c\u1ee7a ch\u00fang.<\/p>\n<p>ICCB, v\u1edbi t\u01b0 c\u00e1ch l\u00e0 thi\u1ebft b\u1ecb Lo\u1ea1i B, \u0111\u01b0\u1ee3c thi\u1ebft k\u1ebf v\u00e0 th\u1eed nghi\u1ec7m \u0111\u1eb7c bi\u1ec7t \u0111\u1ec3 ch\u1ecbu \u0111\u1ef1ng ng\u1eafn h\u1ea1n. C\u00e1c \u0111\u1ecbnh m\u1ee9c Icw ph\u1ed5 bi\u1ebfn bao g\u1ed3m:<\/p>\n<ul>\n<li><strong>42kA trong 0,1 gi\u00e2y<\/strong> (ph\u1ed5 bi\u1ebfn cho khung 630-800A)<\/li>\n<li><strong>50kA trong 0,5 gi\u00e2y<\/strong> (ICCB h\u1ea1ng trung)<\/li>\n<li><strong>65kA trong 1,0 gi\u00e2y<\/strong> (ICCB h\u1ea1ng n\u1eb7ng cho m\u00f4i tr\u01b0\u1eddng s\u1ef1 c\u1ed1 nghi\u00eam tr\u1ecdng)<\/li>\n<\/ul>\n<p>\u0110\u00e2y kh\u00f4ng ph\u1ea3i l\u00e0 nh\u1eefng tuy\u00ean b\u1ed1 ti\u1ebfp th\u1ecb\u2014\u0111\u00e2y l\u00e0 nh\u1eefng \u0111\u1ecbnh m\u1ee9c \u0111\u00e3 \u0111\u01b0\u1ee3c ki\u1ec3m tra v\u00e0 x\u00e1c minh theo ti\u00eau chu\u1ea9n IEC 60947-2. Trong qu\u00e1 tr\u00ecnh th\u1eed nghi\u1ec7m, b\u1ed9 ng\u1eaft m\u1ea1ch ph\u1ea3i ch\u1ecbu d\u00f2ng \u0111i\u1ec7n Icw \u0111\u1ecbnh m\u1ee9c trong kho\u1ea3ng th\u1eddi gian quy \u0111\u1ecbnh trong khi v\u1eabn gi\u1eef \u1edf tr\u1ea1ng th\u00e1i \u0111\u00f3ng (kh\u00f4ng ho\u1ea1t \u0111\u1ed9ng ng\u1eaft). Sau th\u1eed nghi\u1ec7m, b\u1ed9 ng\u1eaft m\u1ea1ch kh\u00f4ng \u0111\u01b0\u1ee3c c\u00f3 b\u1ea5t k\u1ef3 h\u01b0 h\u1ecfng n\u00e0o, duy tr\u00ec kh\u1ea3 n\u0103ng ch\u1ecbu \u0111i\u1ec7n m\u00f4i v\u00e0 ti\u1ebfp t\u1ee5c ho\u1ea1t \u0111\u1ed9ng trong ph\u1ea1m vi th\u00f4ng s\u1ed1 k\u1ef9 thu\u1eadt.<\/p>\n<p><strong>C\u1eeda S\u1ed5 Ch\u1edd v\u00e0 Xem<\/strong> l\u00e0 c\u00e1ch b\u1ea1n n\u00ean ngh\u0129 v\u1ec1 \u0111\u1ecbnh m\u1ee9c n\u00e0y. N\u1ebfu ICCB c\u1ee7a b\u1ea1n c\u00f3 Icw l\u00e0 42kA trong 0,1 gi\u00e2y, b\u1ea1n c\u00f3 th\u1ec3 \u0111\u1eb7t \u0111\u1ed9 tr\u1ec5 ng\u1eafn h\u1ea1n l\u00ean \u0111\u1ebfn 0,1 gi\u00e2y v\u00e0 b\u1ed9 ng\u1eaft m\u1ea1ch s\u1ebd t\u1ed3n t\u1ea1i b\u1ea5t k\u1ef3 d\u00f2ng \u0111i\u1ec7n s\u1ef1 c\u1ed1 n\u00e0o l\u00ean \u0111\u1ebfn 42kA trong kho\u1ea3ng th\u1eddi gian \u0111\u00f3. \u0110i\u1ec1u n\u00e0y cho ph\u00e9p c\u00e1c b\u1ed9 ng\u1eaft m\u1ea1ch h\u1ea1 ngu\u1ed3n c\u1ee7a b\u1ea1n\u2014th\u01b0\u1eddng ng\u1eaft trong 20-80ms t\u00f9y thu\u1ed9c v\u00e0o c\u01b0\u1eddng \u0111\u1ed9 s\u1ef1 c\u1ed1 v\u00e0 lo\u1ea1i b\u1ed9 ng\u1eaft m\u1ea1ch\u2014c\u00f3 th\u1eddi gian ho\u1ea1t \u0111\u1ed9ng tr\u01b0\u1edbc.<\/p>\n<p>\u0110\u00e2y l\u00e0 c\u00e1ch \u0111\u1ecbnh c\u1ee1 Icw cho h\u1ec7 th\u1ed1ng c\u1ee7a b\u1ea1n:<\/p>\n<ol>\n<li><strong>T\u00ednh to\u00e1n d\u00f2ng \u0111i\u1ec7n ng\u1eafn m\u1ea1ch ti\u1ec1m n\u0103ng t\u1ea1i v\u1ecb tr\u00ed b\u1ed9 ng\u1eaft m\u1ea1ch ch\u00ednh.<\/strong> N\u1ebfu b\u1ea1n \u0111\u01b0\u1ee3c c\u1ea5p ngu\u1ed3n t\u1eeb m\u00e1y bi\u1ebfn \u00e1p 1000kVA v\u1edbi tr\u1edf kh\u00e1ng 6%, \u1edf 400V, d\u00f2ng \u0111i\u1ec7n s\u1ef1 c\u1ed1 kh\u1ea3 d\u1ee5ng c\u1ee7a b\u1ea1n l\u00e0 kho\u1ea3ng 36kA. B\u1ea1n c\u1ea7n \u0111\u1ecbnh m\u1ee9c Icw cao h\u01a1n gi\u00e1 tr\u1ecb n\u00e0y.<\/li>\n<li><strong>X\u00e1c \u0111\u1ecbnh th\u1eddi gian ng\u1eaft c\u1ee7a b\u1ed9 ng\u1eaft m\u1ea1ch h\u1ea1 ngu\u1ed3n c\u1ee7a b\u1ea1n.<\/strong> \u0110\u1ed1i v\u1edbi MCCB trong ph\u1ea1m vi 100-630A ng\u1eaft s\u1ef1 c\u1ed1 trong v\u00f9ng ng\u1eaft t\u1eeb t\u00ednh c\u1ee7a ch\u00fang, h\u00e3y d\u1ef1 ki\u1ebfn th\u1eddi gian ng\u1eaft l\u00e0 20-50ms. \u0110\u1ed1i v\u1edbi c\u00e1c m\u1ee9c s\u1ef1 c\u1ed1 cao h\u01a1n g\u1ea7n v\u1edbi \u0111\u1ecbnh m\u1ee9c Icu c\u1ee7a ch\u00fang, th\u1eddi gian ng\u1eaft k\u00e9o d\u00e0i \u0111\u1ebfn 50-100ms.<\/li>\n<li><strong>Th\u00eam h\u1ec7 s\u1ed1 an to\u00e0n v\u00e0 ch\u1ecdn th\u1eddi gian Icw.<\/strong> N\u1ebfu b\u1ed9 ng\u1eaft m\u1ea1ch h\u1ea1 ngu\u1ed3n ch\u1eadm nh\u1ea5t c\u1ee7a b\u1ea1n ng\u1eaft trong 80ms, h\u00e3y ch\u1ec9 \u0111\u1ecbnh th\u1eddi gian Icw \u00edt nh\u1ea5t l\u00e0 0,1 gi\u00e2y (100ms). Th\u00f4ng l\u1ec7 ph\u1ed5 bi\u1ebfn l\u00e0 m\u1ed9t b\u01b0\u1edbc th\u1eddi gian tr\u00ean y\u00eau c\u1ea7u \u0111\u00e3 t\u00ednh to\u00e1n c\u1ee7a b\u1ea1n. N\u1ebfu 0,1 gi\u00e2y l\u00e0 c\u1eadn bi\u00ean, h\u00e3y ch\u1ec9 \u0111\u1ecbnh 0,25 gi\u00e2y ho\u1eb7c 0,5 gi\u00e2y.<\/li>\n<li><strong>\u0110\u1eb7t \u0111\u1ed9 tr\u1ec5 ng\u1eafn h\u1ea1n c\u1ee7a b\u1ea1n.<\/strong> V\u1edbi \u0111\u1ecbnh m\u1ee9c Icw 42kA \/ 0,1 gi\u00e2y v\u00e0 d\u00f2ng \u0111i\u1ec7n s\u1ef1 c\u1ed1 \u0111\u00e3 t\u00ednh to\u00e1n l\u00e0 36kA, b\u1ea1n c\u00f3 th\u1ec3 \u0111\u1eb7t \u0111\u1ed9 tr\u1ec5 ng\u1eafn h\u1ea1n 0,1 gi\u00e2y m\u1ed9t c\u00e1ch an to\u00e0n tr\u00ean ICCB c\u1ee7a m\u00ecnh, bi\u1ebft r\u1eb1ng n\u00f3 s\u1ebd t\u1ed3n t\u1ea1i cho \u0111\u1ebfn khi thi\u1ebft b\u1ecb h\u1ea1 ngu\u1ed3n ng\u1eaft s\u1ef1 c\u1ed1.<\/li>\n<\/ol>\n<p><img loading=\"lazy\" decoding=\"async\" class=\"alignnone size-full wp-image-20197\" src=\"https:\/\/test.viox.com\/wp-content\/uploads\/2025\/11\/Icw-Rating-and-Selectivity-Window-Timeline.webp\" alt=\"Icw Rating and Selectivity Window Timeline\" width=\"800\" height=\"360\" srcset=\"https:\/\/test.viox.com\/wp-content\/uploads\/2025\/11\/Icw-Rating-and-Selectivity-Window-Timeline.webp 800w, https:\/\/test.viox.com\/wp-content\/uploads\/2025\/11\/Icw-Rating-and-Selectivity-Window-Timeline-300x135.webp 300w, https:\/\/test.viox.com\/wp-content\/uploads\/2025\/11\/Icw-Rating-and-Selectivity-Window-Timeline-768x346.webp 768w, https:\/\/test.viox.com\/wp-content\/uploads\/2025\/11\/Icw-Rating-and-Selectivity-Window-Timeline-18x8.webp 18w, https:\/\/test.viox.com\/wp-content\/uploads\/2025\/11\/Icw-Rating-and-Selectivity-Window-Timeline-600x270.webp 600w\" sizes=\"(max-width: 800px) 100vw, 800px\" \/><\/p>\n<p>T\u00ednh to\u00e1n \u0111\u00f3 l\u00e0 <strong>K\u1ebb Gi\u1ebft Ng\u01b0\u1eddi H\u00e0ng Lo\u1ea1t<\/strong> \u0111ang ho\u1ea1t \u0111\u1ed9ng\u2014thi\u1ebft k\u1ebf t\u00ednh ch\u1ecdn l\u1ecdc v\u00e0o h\u1ec7 th\u1ed1ng c\u1ee7a b\u1ea1n thay v\u00ec hy v\u1ecdng v\u00e0o n\u00f3.<\/p>\n<h3>B\u1ed9 ph\u1eadn b\u1ea3o v\u1ec7: Nhi\u1ec7t-T\u1eeb so v\u1edbi Vi x\u1eed l\u00fd LSIG<\/h3>\n<p><strong>MCCBs<\/strong> th\u01b0\u1eddng \u0111i k\u00e8m v\u1edbi m\u1ed9t trong hai lo\u1ea1i b\u1ed9 ph\u1eadn b\u1ea3o v\u1ec7:<\/p>\n<ul>\n<li><strong>Nhi\u1ec7t-t\u1eeb:<\/strong> M\u1ed9t d\u1ea3i l\u01b0\u1ee1ng kim \u0111\u1ec3 b\u1ea3o v\u1ec7 qu\u00e1 t\u1ea3i (ph\u1ea7n \u201cnhi\u1ec7t\u201d) v\u00e0 m\u1ed9t cu\u1ed9n d\u00e2y \u0111i\u1ec7n t\u1eeb \u0111\u1ec3 b\u1ea3o v\u1ec7 ng\u1eafn m\u1ea1ch (ph\u1ea7n \u201ct\u1eeb\u201d). Kh\u1ea3 n\u0103ng \u0111i\u1ec1u ch\u1ec9nh b\u1ecb h\u1ea1n ch\u1ebf\u2014c\u00f3 th\u1ec3 l\u00e0 m\u1ed9t m\u1eb7t s\u1ed1 \u0111\u1ec3 \u0111i\u1ec1u ch\u1ec9nh \u0111i\u1ec3m \u0111\u1eb7t nhi\u1ec7t trong ph\u1ea1m vi \u00b120%. Ch\u00fang m\u1ea1nh m\u1ebd, \u0111\u00e1ng tin c\u1eady v\u00e0 kh\u00f4ng c\u1ea7n b\u1ea3o tr\u00ec. Ch\u00fang c\u0169ng kh\u00f4ng th\u00f4ng minh l\u1eafm.<\/li>\n<li><strong>\u0110i\u1ec7n t\u1eed c\u01a1 b\u1ea3n:<\/strong> M\u1ed9t b\u1ed9 ph\u1eadn b\u1ea3o v\u1ec7 d\u1ef1a tr\u00ean vi x\u1eed l\u00fd v\u1edbi kh\u1ea3 n\u0103ng \u0111i\u1ec1u ch\u1ec9nh nhi\u1ec1u h\u01a1n m\u1ed9t ch\u00fat\u2014c\u00f3 l\u1ebd l\u00e0 c\u00e0i \u0111\u1eb7t D\u00e0i h\u1ea1n (L) v\u00e0 T\u1ee9c th\u1eddi (I). B\u1ea1n nh\u1eadn \u0111\u01b0\u1ee3c l\u1ef1a ch\u1ecdn \u0111\u01b0\u1eddng cong, c\u00f3 th\u1ec3 l\u00e0 b\u1ea3o v\u1ec7 ch\u1ea1m \u0111\u1ea5t tr\u00ean c\u00e1c ki\u1ec3u m\u00e1y cao c\u1ea5p h\u01a1n. T\u1ed1t h\u01a1n nhi\u1ec7t-t\u1eeb, nh\u01b0ng v\u1eabn c\u00f2n h\u1ea1n ch\u1ebf so v\u1edbi ICCB.<\/li>\n<\/ul>\n<p><strong>ICCB<\/strong> h\u1ea7u nh\u01b0 ch\u1ec9 s\u1eed d\u1ee5ng c\u00e1c b\u1ed9 ph\u1eadn b\u1ea3o v\u1ec7 d\u1ef1a tr\u00ean vi x\u1eed l\u00fd ti\u00ean ti\u1ebfn v\u1edbi \u0111\u1ea7y \u0111\u1ee7 <strong>LSIG<\/strong> b\u1ea3o v\u1ec7\u2014h\u00e3y ngh\u0129 v\u1ec1 n\u00f3 nh\u01b0 m\u1ed9t con dao qu\u00e2n \u0111\u1ed9i Th\u1ee5y S\u0129 \u0111\u1ec3 b\u1ea3o v\u1ec7 m\u1ea1ch:<\/p>\n<ul>\n<li><strong>L (D\u00e0i h\u1ea1n):<\/strong> B\u1ea3o v\u1ec7 qu\u00e1 t\u1ea3i. \u0110i\u1ec3m \u0111\u1eb7t c\u00f3 th\u1ec3 \u0111i\u1ec1u ch\u1ec9nh (th\u01b0\u1eddng l\u00e0 0,4-1,0 \u00d7 In), \u0111\u1ed9 tr\u1ec5 th\u1eddi gian c\u00f3 th\u1ec3 \u0111i\u1ec1u ch\u1ec9nh. \u0110\u00e2y l\u00e0 \u0111\u01b0\u1eddng cong qu\u00e1 t\u1ea3i nhi\u1ec7t c\u1ee7a b\u1ea1n.<\/li>\n<li><strong>S (Ng\u1eafn h\u1ea1n):<\/strong> \u0110\u00e2y l\u00e0 C\u1eeda s\u1ed5 Ch\u1edd v\u00e0 Quan s\u00e1t. \u0110i\u1ec3m \u0111\u1eb7t c\u00f3 th\u1ec3 \u0111i\u1ec1u ch\u1ec9nh (th\u01b0\u1eddng l\u00e0 1,5-10 \u00d7 In), \u0111\u1ed9 tr\u1ec5 th\u1eddi gian c\u00f3 th\u1ec3 \u0111i\u1ec1u ch\u1ec9nh (0,05-1,0 gi\u00e2y). \u0110\u00e2y l\u00e0 c\u00f4ng c\u1ee5 ch\u1ecdn l\u1ecdc c\u1ee7a b\u1ea1n.<\/li>\n<li><strong>I (T\u1ee9c th\u1eddi):<\/strong> Ng\u1eaft c\u1ef1c nhanh \u0111\u1ed1i v\u1edbi d\u00f2ng \u0111i\u1ec7n s\u1ef1 c\u1ed1 r\u1ea5t cao. \u0110i\u1ec3m \u0111\u1eb7t c\u00f3 th\u1ec3 \u0111i\u1ec1u ch\u1ec9nh (th\u01b0\u1eddng l\u00e0 3-15 \u00d7 In), kh\u00f4ng c\u00f3 \u0111\u1ed9 tr\u1ec5 c\u1ed1 \u00fd. \u0110\u00e2y l\u00e0 c\u00e0i \u0111\u1eb7t \u201cc\u00f3 g\u00ec \u0111\u00f3 r\u1ea5t sai, h\u00e3y m\u1edf ngay\u201d.<\/li>\n<li><strong>G (Ch\u1ea1m \u0111\u1ea5t):<\/strong> Ph\u00e1t hi\u1ec7n ch\u1ea1m \u0111\u1ea5t ri\u00eang bi\u1ec7t v\u1edbi \u0111i\u1ec3m \u0111\u1eb7t v\u00e0 \u0111\u1ed9 tr\u1ec5 th\u1eddi gian ri\u00eang. R\u1ea5t quan tr\u1ecdng \u0111\u1ec3 b\u1ea3o v\u1ec7 nh\u00e2n vi\u00ean v\u00e0 ng\u0103n ng\u1eeba h\u1ecfa ho\u1ea1n do ch\u1ea1m \u0111\u1ea5t.<\/li>\n<\/ul>\n<p>T\u1ea1i sao kh\u1ea3 n\u0103ng \u0111i\u1ec1u ch\u1ec9nh n\u00e0y l\u1ea1i quan tr\u1ecdng? B\u1edfi v\u00ec m\u1ecdi h\u1ec7 th\u1ed1ng \u0111i\u1ec7n \u0111\u1ec1u l\u00e0 duy nh\u1ea5t. D\u00f2ng \u0111i\u1ec7n kh\u1edfi \u0111\u1ed9ng \u0111\u1ed9ng c\u01a1 c\u1ee7a b\u1ea1n c\u00f3 th\u1ec3 l\u00e0 6 \u00d7 In. Nghi\u00ean c\u1ee9u ph\u1ed1i h\u1ee3p h\u1ea1 ngu\u1ed3n c\u1ee7a b\u1ea1n c\u00f3 th\u1ec3 y\u00eau c\u1ea7u \u0111\u1ed9 tr\u1ec5 0,2 gi\u00e2y \u1edf 8 \u00d7 In. B\u1ea3o v\u1ec7 ch\u1ea1m \u0111\u1ea5t c\u1ee7a b\u1ea1n c\u1ea7n ph\u1ed1i h\u1ee3p v\u1edbi GFCI h\u1ea1 ngu\u1ed3n. B\u1ed9 ph\u1eadn b\u1ea3o v\u1ec7 LSIG cho ph\u00e9p b\u1ea1n quay s\u1ed1 ch\u00ednh x\u00e1c b\u1ea3o v\u1ec7 v\u00e0 ph\u1ed1i h\u1ee3p m\u00e0 h\u1ec7 th\u1ed1ng c\u1ee7a b\u1ea1n y\u00eau c\u1ea7u.<\/p>\n<p>V\u1edbi b\u1ed9 ph\u1eadn b\u1ea3o v\u1ec7 c\u01a1 b\u1ea3n c\u1ee7a MCCB, b\u1ea1n b\u1ecb m\u1eafc k\u1eb9t v\u1edbi c\u00e0i \u0111\u1eb7t g\u1ed1c ho\u1eb7c \u0111i\u1ec1u ch\u1ec9nh r\u1ea5t h\u1ea1n ch\u1ebf. B\u1ea1n c\u00f3 th\u1ec3 ch\u1ec9 \u0111\u1ecbnh m\u1ed9t ki\u1ec3u b\u1ed9 ng\u1eaft m\u1ea1ch kh\u00e1c v\u1edbi m\u1ed9t \u0111\u01b0\u1eddng cong ng\u1eaft kh\u00e1c v\u00e0 hy v\u1ecdng n\u00f3 ho\u1ea1t \u0111\u1ed9ng. V\u1edbi ICCB, b\u1ea1n l\u1eadp tr\u00ecnh ch\u00ednh x\u00e1c b\u1ea3o v\u1ec7 b\u1ea1n c\u1ea7n.<\/p>\n<p>V\u00e0 \u0111\u00e2y l\u00e0 m\u1ed9t l\u1ee3i th\u1ebf th\u1ef1c t\u1ebf: Khi h\u1ec7 th\u1ed1ng c\u1ee7a b\u1ea1n thay \u0111\u1ed5i\u2014khi b\u1ea1n th\u00eam m\u1ed9t VFD l\u1edbn l\u00e0m thay \u0111\u1ed5i c\u1ea5u h\u00ecnh d\u00f2ng \u0111i\u1ec7n s\u1ef1 c\u1ed1 c\u1ee7a b\u1ea1n ho\u1eb7c khi b\u1ea1n th\u00eam c\u00e1c m\u1ea1ch h\u1ea1 ngu\u1ed3n y\u00eau c\u1ea7u ph\u1ed1i h\u1ee3p kh\u00e1c nhau\u2014b\u1ea1n c\u00f3 th\u1ec3 l\u1eadp tr\u00ecnh l\u1ea1i b\u1ed9 ph\u1eadn b\u1ea3o v\u1ec7 ICCB. V\u1edbi MCCB, b\u1ea1n c\u00f3 th\u1ec3 thay th\u1ebf b\u1ed9 ng\u1eaft m\u1ea1ch.<\/p>\n<h3>\u0110\u1ecbnh m\u1ee9c d\u00f2ng \u0111i\u1ec7n v\u00e0 Ph\u1ea1m vi \u1ee9ng d\u1ee5ng<\/h3>\n<p><strong>MCCBs<\/strong> bao g\u1ed3m ph\u1ea1m vi t\u1eeb 15A \u0111\u1ebfn 2500A. \u0110i\u1ec3m m\u1ea1nh c\u1ee7a ch\u00fang l\u00e0 15-1600A, n\u01a1i ch\u00fang th\u1ed1ng tr\u1ecb ph\u00e2n ph\u1ed1i ph\u1ee5, trung t\u00e2m \u0111i\u1ec1u khi\u1ec3n \u0111\u1ed9ng c\u01a1 v\u00e0 b\u1ea3o v\u1ec7 m\u1ea1ch nh\u00e1nh. \u1ede \u0111\u1ea7u tr\u00ean (1600-2500A), b\u1ea1n \u0111ang xem x\u00e9t c\u00e1c MCCB chuy\u00ean d\u1ee5ng, l\u1edbn v\u1ec1 m\u1eb7t v\u1eadt l\u00fd l\u00e0m m\u1edd ranh gi\u1edbi v\u1edbi ICCB\u2014nh\u01b0ng ch\u00fang v\u1eabn l\u00e0 thi\u1ebft b\u1ecb Lo\u1ea1i A kh\u00f4ng c\u00f3 \u0111\u1ecbnh m\u1ee9c Icw c\u00f3 \u00fd ngh\u0129a.<\/p>\n<p><strong>ICCB<\/strong> th\u01b0\u1eddng b\u1eaft \u0111\u1ea7u t\u1eeb 400A v\u00e0 m\u1edf r\u1ed9ng \u0111\u1ebfn 5000A tr\u1edf l\u00ean. M\u1ee5c \u0111\u00edch thi\u1ebft k\u1ebf c\u1ee7a ch\u00fang l\u00e0 ph\u00e2n ph\u1ed1i ch\u00ednh\u2014thi\u1ebft b\u1ecb \u0111\u1ea7u v\u00e0o d\u1ecbch v\u1ee5, thi\u1ebft b\u1ecb \u0111\u00f3ng c\u1eaft ch\u00ednh, b\u1ed9 ng\u1eaft m\u1ea1ch li\u00ean k\u1ebft v\u00e0 b\u1ea3o v\u1ec7 b\u1ed9 c\u1ea5p ngu\u1ed3n quan tr\u1ecdng, n\u01a1i t\u00ednh ch\u1ecdn l\u1ecdc v\u00e0 \u0111\u1ed9 tin c\u1eady l\u00e0 t\u1ed1i quan tr\u1ecdng. D\u01b0\u1edbi 400A, ICCB r\u1ea5t hi\u1ebfm; tr\u00ean 2500A, ch\u00fang b\u1eaft \u0111\u1ea7u nh\u01b0\u1eddng ch\u1ed7 cho B\u1ed9 ng\u1eaft m\u1ea1ch kh\u00f4ng kh\u00ed (ACB), cung c\u1ea5p \u0111\u1ecbnh m\u1ee9c th\u1eadm ch\u00ed c\u00f2n cao h\u01a1n v\u00e0 kh\u1ea3 n\u0103ng b\u1ea3o tr\u00ec k\u00e9o ra ho\u00e0n to\u00e0n.<\/p>\n<p>C\u00f3 m\u1ed9t v\u00f9ng ch\u1ed3ng l\u1ea5p: 400-2500A. Trong ph\u1ea1m vi n\u00e0y, b\u1ea1n c\u00f3 th\u1ec3 ch\u1ec9 \u0111\u1ecbnh MCCB ho\u1eb7c ICCB. Ti\u00eau ch\u00ed quy\u1ebft \u0111\u1ecbnh c\u1ee7a b\u1ea1n:<\/p>\n<ul>\n<li><strong>\u0110\u1ea7u v\u00e0o ch\u00ednh ho\u1eb7c ph\u00e2n ph\u1ed1i ch\u00ednh quan tr\u1ecdng?<\/strong> \u2192 ICCB<\/li>\n<li><strong>C\u1ea7n t\u00ednh ch\u1ecdn l\u1ecdc th\u1ef1c s\u1ef1 v\u1edbi c\u00e1c thi\u1ebft b\u1ecb h\u1ea1 ngu\u1ed3n?<\/strong> \u2192 ICCB<\/li>\n<li><strong>Ph\u00e2n ph\u1ed1i ph\u1ee5 ho\u1eb7c b\u1ed9 c\u1ea5p ngu\u1ed3n kh\u00f4ng quan tr\u1ecdng?<\/strong> \u2192 MCCB ti\u1ebft ki\u1ec7m chi ph\u00ed<\/li>\n<li><strong>D\u00f2ng \u0111i\u1ec7n s\u1ef1 c\u1ed1 ti\u1ec1m n\u0103ng c\u1ee7a h\u1ec7 th\u1ed1ng &gt;30kA v\u00e0 y\u00eau c\u1ea7u ph\u1ed1i h\u1ee3p?<\/strong> \u2192 ICCB<\/li>\n<li><strong>B\u1ea3ng \u0111i\u1ec1u khi\u1ec3n b\u1ecb h\u1ea1n ch\u1ebf v\u1ec1 kh\u00f4ng gian?<\/strong> \u2192 MCCB nh\u1ecf g\u1ecdn h\u01a1n<\/li>\n<\/ul>\n<p>D\u01b0\u1edbi 400A, MCCB th\u01b0\u1eddng l\u00e0 l\u1ef1a ch\u1ecdn th\u1ef1c t\u1ebf duy nh\u1ea5t c\u1ee7a b\u1ea1n tr\u1eeb khi b\u1ea1n s\u1eb5n s\u00e0ng t\u0103ng k\u00edch th\u01b0\u1edbc ICCB \u0111\u00e1ng k\u1ec3. Tr\u00ean 2500A, ICCB tr\u1edf n\u00ean b\u1eaft bu\u1ed9c \u0111\u1ec3 c\u00f3 t\u00ednh kh\u1ea3 d\u1ee5ng v\u00e0 hi\u1ec7u su\u1ea5t t\u1ed1t.<\/p>\n<h3>B\u1ea3ng so s\u00e1nh<\/h3>\n<table style=\"width: 100%; border-collapse: collapse; margin: 20px 0;\" border=\"1\" cellspacing=\"0\" cellpadding=\"10\">\n<thead>\n<tr style=\"background-color: #f0f0f0;\">\n<th style=\"text-align: left;\">Tham s\u1ed1<\/th>\n<th style=\"text-align: left;\">MCCB<\/th>\n<th style=\"text-align: left;\">ICCB<\/th>\n<\/tr>\n<\/thead>\n<tbody>\n<tr>\n<td><strong>Ph\u1ea1m Vi Hi\u1ec7n T\u1ea1i<\/strong><\/td>\n<td>15-2500A<\/td>\n<td>400-5000A+<\/td>\n<\/tr>\n<tr>\n<td><strong>Lo\u1ea1i IEC<\/strong><\/td>\n<td>Lo\u1ea1i A (kh\u00f4ng c\u00f3 \u00fd \u0111\u1ecbnh ch\u1ecdn l\u1ecdc)<\/td>\n<td>H\u1ea1ng m\u1ee5c B (t\u00ednh ch\u1ecdn l\u1ecdc theo thi\u1ebft k\u1ebf)<\/td>\n<\/tr>\n<tr>\n<td><strong>\u0110\u1ecbnh m\u1ee9c Icw<\/strong><\/td>\n<td>Kh\u00f4ng c\u00f3 (ho\u1eb7c kh\u00f4ng \u0111\u01b0\u1ee3c \u0111\u00e1nh gi\u00e1)<\/td>\n<td>30-85kA trong 0.05-1.0 gi\u00e2y<\/td>\n<\/tr>\n<tr>\n<td><strong>Kh\u1ea3 N\u0103ng C\u1eaft (Icu)<\/strong><\/td>\n<td>L\u00ean \u0111\u1ebfn 150kA<\/td>\n<td>L\u00ean \u0111\u1ebfn 150kA+<\/td>\n<\/tr>\n<tr>\n<td><strong>B\u1ed9 Trip<\/strong><\/td>\n<td>Nhi\u1ec7t t\u1eeb ho\u1eb7c \u0111i\u1ec7n t\u1eed c\u01a1 b\u1ea3n<\/td>\n<td>Vi x\u1eed l\u00fd LSIG (ho\u00e0n to\u00e0n c\u00f3 th\u1ec3 \u0111i\u1ec1u ch\u1ec9nh)<\/td>\n<\/tr>\n<tr>\n<td><strong>Tr\u1ec5 ng\u1eafn m\u1ea1ch<\/strong><\/td>\n<td>Kh\u00f4ng c\u00f3 s\u1eb5n<\/td>\n<td>C\u00f3 th\u1ec3 \u0111i\u1ec1u ch\u1ec9nh 0.05-1.0 gi\u00e2y<\/td>\n<\/tr>\n<tr>\n<td><strong>S\u1ef1 thi c\u00f4ng<\/strong><\/td>\n<td>Ni\u00eam phong, kh\u00f4ng th\u1ec3 b\u1ea3o tr\u00ec<\/td>\n<td>D\u1ea1ng m\u00f4-\u0111un, c\u00f3 th\u1ec3 b\u1ea3o tr\u00ec t\u1ea1i hi\u1ec7n tr\u01b0\u1eddng<\/td>\n<\/tr>\n<tr>\n<td><strong>Chi ph\u00ed \u0111i\u1ec3n h\u00ecnh (630A)<\/strong><\/td>\n<td>$800-$1,500<\/td>\n<td>$7,000-$12,000<\/td>\n<\/tr>\n<tr>\n<td><strong>Th\u1ec3 Ch\u1ea5t K\u00edch Th\u01b0\u1edbc<\/strong><\/td>\n<td>Nh\u1ecf g\u1ecdn<\/td>\n<td>L\u1edbn (c\u1ea5p t\u1ee7 \u0111i\u1ec7n)<\/td>\n<\/tr>\n<tr>\n<td><strong>Kh\u1ea3 n\u0103ng b\u1ea3o tr\u00ec v\u00f2ng \u0111\u1eddi<\/strong><\/td>\n<td>Thay th\u1ebf to\u00e0n b\u1ed9 thi\u1ebft b\u1ecb<\/td>\n<td>Thay th\u1ebf b\u1ed9 trip ho\u1eb7c ti\u1ebfp \u0111i\u1ec3m<\/td>\n<\/tr>\n<tr>\n<td><strong>\u0110i\u1ec3n H\u00ecnh D\u1ee5ng<\/strong><\/td>\n<td>Ph\u00e2n ph\u1ed1i nh\u00e1nh, m\u1ea1ch nh\u00e1nh<\/td>\n<td>Ngu\u1ed3n c\u1ea5p ch\u00ednh, ngu\u1ed3n ch\u00ednh quan tr\u1ecdng<\/td>\n<\/tr>\n<tr>\n<td><strong>Kh\u1ea3 n\u0103ng ph\u1ed1i h\u1ee3p<\/strong><\/td>\n<td>H\u1ea1n ch\u1ebf (ch\u1ec9 trip nhanh)<\/td>\n<td>Tuy\u1ec7t v\u1eddi (c\u00f3 s\u1eb5n tr\u1ec5 th\u1eddi gian)<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/section>\n<section id=\"decision-framework\">\n<h2>Khi n\u00e0o n\u00ean s\u1eed d\u1ee5ng MCCB so v\u1edbi ICCB: C\u00e2y quy\u1ebft \u0111\u1ecbnh c\u1ee7a k\u1ef9 s\u01b0<\/h2>\n<p>Vi\u1ec7c l\u1ef1a ch\u1ecdn gi\u1eefa MCCB v\u00e0 ICCB kh\u00f4ng ch\u1ec9 l\u00e0 v\u1ec1 c\u00e1c th\u00f4ng s\u1ed1 k\u1ef9 thu\u1eadt ri\u00eang l\u1ebb\u2014m\u00e0 l\u00e0 v\u1ec1 vi\u1ec7c k\u1ebft h\u1ee3p kh\u1ea3 n\u0103ng c\u1ee7a b\u1ed9 ng\u1eaft m\u1ea1ch v\u1edbi c\u00e1c y\u00eau c\u1ea7u h\u1ec7 th\u1ed1ng v\u00e0 \u01b0u ti\u00ean kinh doanh.<\/p>\n<h3>B\u01b0\u1edbc 1: X\u00e1c \u0111\u1ecbnh v\u1ecb tr\u00ed \u1ee9ng d\u1ee5ng c\u1ee7a b\u1ea1n<\/h3>\n<p>C\u00e2u h\u1ecfi \u0111\u1ea7u ti\u00ean l\u00e0 v\u1ec1 th\u1ee9 b\u1eadc: B\u1ed9 ng\u1eaft m\u1ea1ch n\u00e0y n\u1eb1m \u1edf \u0111\u00e2u trong h\u1ec7 th\u1ed1ng ph\u00e2n ph\u1ed1i c\u1ee7a b\u1ea1n?<\/p>\n<p><strong>B\u1ed9 ng\u1eaft m\u1ea1ch d\u1ecbch v\u1ee5 \u0111\u1ea7u v\u00e0o ch\u00ednh?<\/strong> \u0110\u00e2y l\u00e0 l\u00e3nh \u0111\u1ecba c\u1ee7a ICCB. B\u1ea1n \u0111ang b\u1ea3o v\u1ec7 to\u00e0n b\u1ed9 c\u01a1 s\u1edf v\u00e0 m\u1ed9t chuy\u1ebfn \u0111i \u1edf \u0111\u00e2y c\u00f3 ngh\u0129a l\u00e0 b\u00f3ng t\u1ed1i ho\u00e0n to\u00e0n. X\u1ebfp h\u1ea1ng Icw kh\u00f4ng ph\u1ea3i l\u00e0 t\u00f9y ch\u1ecdn\u2014\u0111\u00f3 l\u00e0 ch\u00ednh s\u00e1ch b\u1ea3o hi\u1ec3m c\u1ee7a b\u1ea1n ch\u1ed1ng l\u1ea1i s\u1ef1 c\u1ed1 t\u1ea7ng. Ngay c\u1ea3 khi b\u1ea1n \u0111ang v\u1eadn h\u00e0nh m\u1ed9t c\u01a1 s\u1edf t\u01b0\u01a1ng \u0111\u1ed1i nh\u1ecf (d\u1ecbch v\u1ee5 400A), h\u1eadu qu\u1ea3 c\u1ee7a vi\u1ec7c v\u1ea5p b\u1ed9 ng\u1eaft m\u1ea1ch ch\u00ednh th\u01b0\u1eddng bi\u1ec7n minh cho ph\u00ed b\u1ea3o hi\u1ec3m ICCB.<\/p>\n<p><strong>B\u1ed9 ng\u1eaft m\u1ea1ch ph\u00e2n ph\u1ed1i ph\u1ee5 ho\u1eb7c b\u1ed9 c\u1ea5p ngu\u1ed3n l\u1edbn?<\/strong> B\u00e2y gi\u1edd b\u1ea1n \u0111ang \u1edf trong l\u00e3nh th\u1ed5 quy\u1ebft \u0111\u1ecbnh. N\u1ebfu b\u1ed9 ng\u1eaft m\u1ea1ch n\u00e0y b\u1ea3o v\u1ec7 m\u1ed9t quy tr\u00ecnh quan tr\u1ecdng (trung t\u00e2m d\u1eef li\u1ec7u, khu ph\u1eabu thu\u1eadt b\u1ec7nh vi\u1ec7n, ph\u00f2ng s\u1ea1ch b\u00e1n d\u1eabn), th\u00ec \u01b0u \u0111i\u1ec3m v\u1ec1 t\u00ednh ch\u1ecdn l\u1ecdc v\u00e0 \u0111\u1ed9 tin c\u1eady c\u1ee7a ICCB s\u1ebd nghi\u00eang v\u1ec1 c\u00e1n c\u00e2n. N\u1ebfu n\u00f3 cung c\u1ea5p n\u0103ng l\u01b0\u1ee3ng cho h\u1ec7 th\u1ed1ng chi\u1ebfu s\u00e1ng v\u0103n ph\u00f2ng ti\u00eau chu\u1ea9n ho\u1eb7c t\u1ea3i kh\u00f4ng quan tr\u1ecdng, th\u00ec MCCB c\u00f3 l\u1ebd l\u00e0 \u0111\u1ee7.<\/p>\n<p><strong>M\u1ea1ch nh\u00e1nh ho\u1eb7c b\u1ea3o v\u1ec7 \u0111\u1ed9ng c\u01a1?<\/strong> MCCB l\u00e0 c\u00e2u tr\u1ea3 l\u1eddi c\u1ee7a b\u1ea1n. D\u01b0\u1edbi 400A v\u00e0 c\u1ea5p ngu\u1ed3n cho t\u1ea3i s\u1eed d\u1ee5ng cu\u1ed1i, ph\u00ed b\u1ea3o hi\u1ec3m chi ph\u00ed c\u1ee7a ICCB kh\u00f4ng th\u1ec3 \u0111\u01b0\u1ee3c bi\u1ec7n minh. MCCB v\u01b0\u1ee3t tr\u1ed9i trong vai tr\u00f2 n\u00e0y\u2014ch\u00fang ti\u1ebft ki\u1ec7m chi ph\u00ed, nh\u1ecf g\u1ecdn v\u00e0 cung c\u1ea5p kh\u1ea3 n\u0103ng b\u1ea3o v\u1ec7 tuy\u1ec7t v\u1eddi cho c\u00e1c m\u1ea1ch nh\u00e1nh.<\/p>\n<p>Nguy\u00ean t\u1eafc chung: N\u1ebfu m\u1ed9t chuy\u1ebfn \u0111i t\u1ea1i v\u1ecb tr\u00ed c\u1ee7a b\u1ed9 ng\u1eaft m\u1ea1ch n\u00e0y g\u00e2y ra s\u1ef1 c\u1ed1 tr\u00ean to\u00e0n c\u01a1 s\u1edf ho\u1eb7c t\u1eaft c\u00e1c h\u1ec7 th\u1ed1ng quan tr\u1ecdng, b\u1ea1n c\u1ea7n kh\u1ea3 n\u0103ng ch\u1ecdn l\u1ecdc c\u1ee7a ICCB.<\/p>\n<h3>B\u01b0\u1edbc 2: T\u00ednh thu\u1ebf ch\u1ecdn l\u1ecdc<\/h3>\n<p>H\u00e3y n\u00f3i v\u1ec1 ti\u1ec1n b\u1ea1c.<\/p>\n<p><img loading=\"lazy\" decoding=\"async\" class=\"alignnone size-full wp-image-20198\" src=\"https:\/\/test.viox.com\/wp-content\/uploads\/2025\/11\/Cost-Benefit-Analysis-MCCB-vs-ICCB.webp\" alt=\"Cost-Benefit Analysis MCCB vs ICCB\" width=\"800\" height=\"600\" srcset=\"https:\/\/test.viox.com\/wp-content\/uploads\/2025\/11\/Cost-Benefit-Analysis-MCCB-vs-ICCB.webp 800w, https:\/\/test.viox.com\/wp-content\/uploads\/2025\/11\/Cost-Benefit-Analysis-MCCB-vs-ICCB-300x225.webp 300w, https:\/\/test.viox.com\/wp-content\/uploads\/2025\/11\/Cost-Benefit-Analysis-MCCB-vs-ICCB-768x576.webp 768w, https:\/\/test.viox.com\/wp-content\/uploads\/2025\/11\/Cost-Benefit-Analysis-MCCB-vs-ICCB-16x12.webp 16w, https:\/\/test.viox.com\/wp-content\/uploads\/2025\/11\/Cost-Benefit-Analysis-MCCB-vs-ICCB-600x450.webp 600w\" sizes=\"(max-width: 800px) 100vw, 800px\" \/><\/p>\n<p><strong>Ph\u00ed b\u1ea3o hi\u1ec3m ICCB so v\u1edbi MCCB t\u01b0\u01a1ng \u0111\u01b0\u01a1ng:<\/strong> \u20ab6.000.000-\u20ab10.000.000 cho c\u00e1c b\u1ed9 ng\u1eaft m\u1ea1ch \u0111\u1ea7u v\u00e0o ch\u00ednh 630-1600A \u0111i\u1ec3n h\u00ecnh.<\/p>\n<p><strong>Chi ph\u00ed c\u1ee7a m\u1ed9t l\u1ed7i t\u1ea7ng:<\/strong> \u0110i\u1ec1u n\u00e0y ph\u1ee5 thu\u1ed9c nhi\u1ec1u v\u00e0o lo\u1ea1i c\u01a1 s\u1edf c\u1ee7a b\u1ea1n:<\/p>\n<ul>\n<li><strong>Nh\u00e0 m\u00e1y s\u1ea3n xu\u1ea5t nh\u1ecf (10 nh\u00e2n vi\u00ean, 500kW):<\/strong> \u20ab35.000.000-\u20ab75.000.000 cho m\u1ed7i l\u1ea7n m\u1ea5t \u0111i\u1ec7n 8 gi\u1edd (m\u1ea5t s\u1ea3n xu\u1ea5t, l\u00e0m th\u00eam gi\u1edd, chi ph\u00ed kh\u1edfi \u0111\u1ed9ng l\u1ea1i)<\/li>\n<li><strong>C\u01a1 s\u1edf s\u1ea3n xu\u1ea5t v\u1eeba (50 nh\u00e2n vi\u00ean, 2MW):<\/strong> \u20ab100.000.000-\u20ab250.000.000 cho m\u1ed7i l\u1ea7n m\u1ea5t \u0111i\u1ec7n 8 gi\u1edd<\/li>\n<li><strong>Trung t\u00e2m d\u1eef li\u1ec7u ho\u1eb7c ho\u1ea1t \u0111\u1ed9ng CNTT:<\/strong> \u20ab540.000 m\u1ed7i gi\u1edd (d\u1ef1a tr\u00ean m\u1ee9c trung b\u00ecnh ng\u00e0nh l\u00e0 \u20ab9.000\/ph\u00fat)<\/li>\n<li><strong>C\u00e1c khu v\u1ef1c ch\u0103m s\u00f3c quan tr\u1ecdng c\u1ee7a b\u1ec7nh vi\u1ec7n:<\/strong> Kh\u00f4ng th\u1ec3 \u0111o l\u01b0\u1eddng b\u1eb1ng c\u00e1c \u0111i\u1ec1u kho\u1ea3n t\u00e0i ch\u00ednh thu\u1ea7n t\u00fay (s\u1ef1 an to\u00e0n c\u1ee7a b\u1ec7nh nh\u00e2n), nh\u01b0ng \u01b0\u1edbc t\u00ednh dao \u0111\u1ed9ng t\u1eeb \u20ab50.000.000-\u20ab200.000.000 m\u1ed7i gi\u1edd trong s\u1ef1 gi\u00e1n \u0111o\u1ea1n ho\u1ea1t \u0111\u1ed9ng<\/li>\n<li><strong>Fab b\u00e1n d\u1eabn ho\u1eb7c quy tr\u00ecnh li\u00ean t\u1ee5c:<\/strong> \u20ab500.000.000-\u20ab2.000.000.000 cho m\u1ed7i l\u1ea7n m\u1ea5t \u0111i\u1ec7n (h\u01b0 h\u1ecfng thi\u1ebft b\u1ecb, m\u1ea5t l\u00f4, chu k\u1ef3 kh\u1edfi \u0111\u1ed9ng l\u1ea1i)<\/li>\n<\/ul>\n<p>Th\u1ef1c hi\u1ec7n ph\u00e9p t\u00ednh cho c\u01a1 s\u1edf c\u1ee7a b\u1ea1n. \u01af\u1edbc t\u00ednh gi\u00e1 tr\u1ecb s\u1ea3n xu\u1ea5t h\u00e0ng gi\u1edd c\u1ee7a b\u1ea1n, th\u00eam chi ph\u00ed ph\u1ebf li\u1ec7u\/kh\u1edfi \u0111\u1ed9ng l\u1ea1i, th\u00eam ph\u00ed b\u1ea3o hi\u1ec3m l\u00e0m th\u00eam gi\u1edd, th\u00eam chi ph\u00ed b\u1ea3o tr\u00ec kh\u1ea9n c\u1ea5p. B\u00e2y gi\u1edd nh\u00e2n v\u1edbi th\u1eddi gian m\u1ea5t \u0111i\u1ec7n trung b\u00ecnh (th\u01b0\u1eddng l\u00e0 4-12 gi\u1edd \u0111\u1ed1i v\u1edbi l\u1ed7i t\u1ea7ng, v\u00ec b\u1ea1n \u0111ang kh\u1eafc ph\u1ee5c s\u1ef1 c\u1ed1 t\u1ea1i sao ch\u00ednh b\u1ecb v\u1ea5p thay v\u00ec ch\u1ec9 \u0111\u1eb7t l\u1ea1i b\u1ed9 ng\u1eaft m\u1ea1ch nh\u00e1nh).<\/p>\n<p><strong>T\u00ednh to\u00e1n ho\u00e0n v\u1ed1n:<\/strong><\/p>\n<p>N\u1ebfu ICCB ng\u0103n ch\u1eb7n ch\u1ec9 m\u1ed9t l\u1ed7i t\u1ea7ng trong v\u00f2ng \u0111\u1eddi 25 n\u0103m c\u1ee7a n\u00f3, n\u00f3 s\u1ebd t\u1ef1 tr\u1ea3 cho m\u00ecnh g\u1ea5p 5-100 l\u1ea7n, t\u00f9y thu\u1ed9c v\u00e0o c\u01a1 s\u1edf c\u1ee7a b\u1ea1n. V\u00e0 \u0111\u00e2y l\u00e0 \u0111i\u1ec3m m\u1ea5u ch\u1ed1t: M\u1ed9t c\u01a1 s\u1edf c\u00f3 t\u00ednh ch\u1ecdn l\u1ecdc k\u00e9m kh\u00f4ng g\u1eb7p m\u1ed9t l\u1ed7i t\u1ea7ng trong 25 n\u0103m. B\u1ea1n th\u01b0\u1eddng th\u1ea5y 3-10 s\u1ef1 ki\u1ec7n t\u1ea7ng tr\u01b0\u1edbc khi ai \u0111\u00f3 cu\u1ed1i c\u00f9ng n\u00e2ng c\u1ea5p b\u1ed9 ng\u1eaft m\u1ea1ch ch\u00ednh. \u0110\u1ebfn l\u00fac \u0111\u00f3, b\u1ea1n \u0111\u00e3 tr\u1ea3 ti\u1ec1n <strong>Thu\u1ebf ch\u1ecdn l\u1ecdc<\/strong> nhi\u1ec1u l\u1ea7n.<\/p>\n<p>Ph\u00ed b\u1ea3o hi\u1ec3m ICCB \u20ab8.000.000 \u0111\u00f3 b\u1eaft \u0111\u1ea7u tr\u00f4ng gi\u1ed1ng nh\u01b0 m\u1ed9t m\u00f3n h\u1eddi.<\/p>\n<h3>B\u01b0\u1edbc 3: Ki\u1ec3m tra d\u00f2ng \u0111i\u1ec7n s\u1ef1 c\u1ed1 v\u00e0 nghi\u00ean c\u1ee9u ph\u1ed1i h\u1ee3p c\u1ee7a b\u1ea1n<\/h3>\n<p>Ki\u1ec3m tra k\u1ef9 thu\u1eadt cu\u1ed1i c\u00f9ng: H\u1ec7 th\u1ed1ng c\u1ee7a b\u1ea1n th\u1eadm ch\u00ed c\u00f3 c\u1ea7n kh\u1ea3 n\u0103ng ph\u1ed1i h\u1ee3p m\u00e0 ICCB cung c\u1ea5p kh\u00f4ng?<\/p>\n<p><strong>T\u00ednh to\u00e1n d\u00f2ng \u0111i\u1ec7n ng\u1eafn m\u1ea1ch ti\u1ec1m n\u0103ng t\u1ea1i b\u1ed9 ng\u1eaft m\u1ea1ch ch\u00ednh.<\/strong> N\u1ebfu b\u1ea1n \u0111\u01b0\u1ee3c c\u1ea5p ngu\u1ed3n t\u1eeb m\u1ed9t m\u00e1y bi\u1ebfn \u00e1p nh\u1ecf (100kVA tr\u1edf xu\u1ed1ng) v\u1edbi tr\u1edf kh\u00e1ng ngu\u1ed3n \u0111\u00e1ng k\u1ec3, d\u00f2ng \u0111i\u1ec7n s\u1ef1 c\u1ed1 kh\u1ea3 d\u1ee5ng c\u1ee7a b\u1ea1n c\u00f3 th\u1ec3 ch\u1ec9 l\u00e0 8-12kA. \u1ede c\u00e1c m\u1ee9c n\u00e0y, ngay c\u1ea3 MCCB c\u0169ng c\u00f3 th\u1eddi gian trip t\u1eeb t\u00ednh t\u01b0\u01a1ng \u0111\u1ed1i ch\u1eadm v\u00e0 c\u00f3 th\u1ec3 \u0111\u1ea1t \u0111\u01b0\u1ee3c s\u1ef1 ph\u1ed1i h\u1ee3p c\u01a1 b\u1ea3n ch\u1ec9 th\u00f4ng qua c\u01b0\u1eddng \u0111\u1ed9 d\u00f2ng \u0111i\u1ec7n. B\u1ea1n c\u00f3 th\u1ec3 kh\u00f4ng c\u1ea7n ph\u1ed1i h\u1ee3p d\u1ef1a tr\u00ean th\u1eddi gian.<\/p>\n<p>Nh\u01b0ng \u0111\u00e2y l\u00e0 th\u1ef1c t\u1ebf: H\u1ea7u h\u1ebft c\u00e1c c\u01a1 s\u1edf th\u01b0\u01a1ng m\u1ea1i v\u00e0 c\u00f4ng nghi\u1ec7p \u0111\u1ec1u c\u00f3 d\u00f2ng \u0111i\u1ec7n s\u1ef1 c\u1ed1 ti\u1ec1m n\u0103ng l\u00e0 20-50kA t\u1ea1i ph\u00e2n ph\u1ed1i ch\u00ednh. \u1ede c\u00e1c m\u1ee9c n\u00e0y, MCCB trip trong 10-20ms, kh\u00f4ng c\u00f2n th\u1eddi gian cho s\u1ef1 ph\u1ed1i h\u1ee3p h\u1ea1 ngu\u1ed3n. B\u1ea1n c\u1ea7n t\u00ednh ch\u1ecdn l\u1ecdc tr\u1ec5 th\u1eddi gian. B\u1ea1n c\u1ea7n C\u1eeda s\u1ed5 Ch\u1edd v\u00e0 Xem. B\u1ea1n c\u1ea7n m\u1ed9t ICCB.<\/p>\n<p><strong>Xem x\u00e9t th\u1eddi gian x\u00f3a b\u1ed9 ng\u1eaft m\u1ea1ch h\u1ea1 ngu\u1ed3n c\u1ee7a b\u1ea1n.<\/strong> N\u1ebfu t\u1ea5t c\u1ea3 c\u00e1c b\u1ed9 ng\u1eaft m\u1ea1ch h\u1ea1 ngu\u1ed3n c\u1ee7a b\u1ea1n l\u00e0 MCB t\u00e1c \u0111\u1ed9ng nhanh ho\u1eb7c MCCB nh\u1ecf x\u00f3a trong v\u00f2ng ch\u01b0a \u0111\u1ea7y 30ms, b\u1ea1n c\u00f3 th\u1ec3 s\u1eed d\u1ee5ng ICCB v\u1edbi \u0111\u1ed9 tr\u1ec5 ng\u1eafn (0,05-0,1 gi\u00e2y) v\u00e0 \u0111\u1ea1t \u0111\u01b0\u1ee3c t\u00ednh ch\u1ecdn l\u1ecdc ho\u00e0n to\u00e0n. N\u1ebfu b\u1ea1n c\u00f3 MCCB h\u1ea1 ngu\u1ed3n l\u1edbn h\u01a1n ho\u1eb7c c\u00e1c thi\u1ebft b\u1ecb ch\u1eadm h\u01a1n m\u1ea5t 80-120ms \u0111\u1ec3 x\u00f3a, b\u1ea1n s\u1ebd c\u1ea7n th\u1eddi gian Icw d\u00e0i h\u01a1n (0,25-0,5 gi\u00e2y).<\/p>\n<p><strong>X\u00e1c minh x\u1ebfp h\u1ea1ng Icw c\u1ee7a b\u1ea1n v\u01b0\u1ee3t qu\u00e1 d\u00f2ng \u0111i\u1ec7n s\u1ef1 c\u1ed1 ti\u1ec1m n\u0103ng c\u1ee7a b\u1ea1n.<\/strong> N\u1ebfu d\u00f2ng \u0111i\u1ec7n s\u1ef1 c\u1ed1 \u0111\u01b0\u1ee3c t\u00ednh to\u00e1n c\u1ee7a b\u1ea1n l\u00e0 38kA, \u0111\u1eebng ch\u1ec9 \u0111\u1ecbnh ICCB v\u1edbi 42kA Icw v\u00e0 g\u1ecdi n\u00f3 l\u00e0 t\u1ed1t. \u0110\u00f3 l\u00e0 bi\u00ean \u0111\u1ed9 10%, qu\u00e1 m\u1ecfng. Ch\u1ec9 \u0111\u1ecbnh 50kA ho\u1eb7c 65kA Icw \u0111\u1ec3 t\u00ednh \u0111\u1ebfn s\u1ef1 thay \u0111\u1ed5i \u0111\u00f3ng g\u00f3p l\u1ed7i ti\u1ec7n \u00edch, c\u00e1c thay \u0111\u1ed5i h\u1ec7 th\u1ed1ng trong t\u01b0\u01a1ng lai v\u00e0 bi\u00ean \u0111\u1ed9 an to\u00e0n.<\/p>\n<p>V\u00e0 n\u1ebfu b\u1ea1n \u0111ang ngh\u0129 r\u1eb1ng, \u201cCh\u00fang t\u00f4i kh\u00f4ng c\u00f3 nghi\u00ean c\u1ee9u ph\u1ed1i h\u1ee3p\u201d\u2014\u0111\u00f3 ch\u00ednh l\u00e0 c\u00e2u tr\u1ea3 l\u1eddi c\u1ee7a b\u1ea1n. N\u1ebfu c\u01a1 s\u1edf c\u1ee7a b\u1ea1n \u0111\u1ee7 quan tr\u1ecdng \u0111\u1ec3 xem x\u00e9t c\u00e2u h\u1ecfi MCCB so v\u1edbi ICCB, b\u1ea1n c\u1ea7n m\u1ed9t nghi\u00ean c\u1ee9u v\u1ec1 ng\u1eafn m\u1ea1ch v\u00e0 ph\u1ed1i h\u1ee3p. M\u1ed9t ICCB m\u00e0 kh\u00f4ng c\u00f3 nghi\u00ean c\u1ee9u ph\u1ed1i h\u1ee3p ph\u00f9 h\u1ee3p gi\u1ed1ng nh\u01b0 mua m\u1ed9t chi\u1ebfc Ferrari v\u00e0 kh\u00f4ng bao gi\u1edd r\u1eddi kh\u1ecfi s\u1ed1 m\u1ed9t. B\u1ea1n \u0111\u00e3 tr\u1ea3 ti\u1ec1n cho kh\u1ea3 n\u0103ng m\u00e0 b\u1ea1n kh\u00f4ng s\u1eed d\u1ee5ng. Ng\u01b0\u1ee3c l\u1ea1i, m\u1ed9t MCCB \u1edf v\u1ecb tr\u00ed ch\u00ednh m\u00e0 kh\u00f4ng c\u00f3 nghi\u00ean c\u1ee9u l\u00e0 m\u1ed9t s\u1ef1 c\u1ed1 t\u1ea7ng (cascade failure) \u0111ang ch\u1edd x\u1ea3y ra.<\/p>\n<p><img loading=\"lazy\" decoding=\"async\" class=\"alignnone size-full wp-image-20199\" src=\"https:\/\/test.viox.com\/wp-content\/uploads\/2025\/11\/Decision-Tree-Flowchart-.webp\" alt=\"Decision Tree Flowchart \" width=\"800\" height=\"585\" srcset=\"https:\/\/test.viox.com\/wp-content\/uploads\/2025\/11\/Decision-Tree-Flowchart-.webp 800w, https:\/\/test.viox.com\/wp-content\/uploads\/2025\/11\/Decision-Tree-Flowchart--300x219.webp 300w, https:\/\/test.viox.com\/wp-content\/uploads\/2025\/11\/Decision-Tree-Flowchart--768x562.webp 768w, https:\/\/test.viox.com\/wp-content\/uploads\/2025\/11\/Decision-Tree-Flowchart--16x12.webp 16w, https:\/\/test.viox.com\/wp-content\/uploads\/2025\/11\/Decision-Tree-Flowchart--600x439.webp 600w\" sizes=\"(max-width: 800px) 100vw, 800px\" \/><\/p>\n<\/section>\n<section id=\"conclusion\">\n<h2>K\u1ebft lu\u1eadn: L\u1ef1a Ch\u1ecdn Ng\u0103n Ch\u1eb7n 124.000 \u0110\u00f4 La Ti\u1ec1n M\u1ea5t \u0110i\u1ec7n<\/h2>\n<p>S\u1ef1 kh\u00e1c bi\u1ec7t gi\u1eefa MCCB v\u00e0 ICCB kh\u00f4ng ph\u1ea3i l\u00e0 kh\u1ea3 n\u0103ng c\u1eaft, k\u00edch th\u01b0\u1edbc v\u1eadt l\u00fd, ho\u1eb7c th\u1eadm ch\u00ed l\u00e0 chi ph\u00ed. M\u00e0 l\u00e0 t\u00ednh ch\u1ecdn l\u1ecdc.<\/p>\n<p>MCCB l\u00e0 thi\u1ebft b\u1ecb Lo\u1ea1i A\u2014b\u1ea3o v\u1ec7 nhanh ch\u00f3ng, \u0111\u00e1ng tin c\u1eady, hi\u1ec7u qu\u1ea3 v\u1ec1 chi ph\u00ed cho c\u00e1c m\u1ea1ch nh\u00e1nh v\u00e0 ph\u00e2n ph\u1ed1i ph\u1ee5. Ch\u00fang v\u01b0\u1ee3t tr\u1ed9i trong nh\u1eefng vai tr\u00f2 n\u00e0y. Nh\u01b0ng \u1edf v\u1ecb tr\u00ed \u0111\u1ea7u v\u00e0o ch\u00ednh, vi\u1ec7c thi\u1ebfu \u0111\u1ecbnh m\u1ee9c Icw c\u00f3 ngh\u0129a l\u00e0 ch\u00fang r\u01a1i v\u00e0o <strong>C\u00e1i B\u1eaby T\u00e1c \u0110\u1ed9ng T\u1ee9c Th\u1eddi<\/strong>: Ch\u00fang kh\u00f4ng th\u1ec3 ph\u00e2n bi\u1ec7t gi\u1eefa c\u00e1c l\u1ed7i m\u00e0 ch\u00fang n\u00ean x\u00f3a v\u00e0 c\u00e1c l\u1ed7i m\u00e0 c\u00e1c thi\u1ebft b\u1ecb h\u1ea1 ngu\u1ed3n n\u00ean x\u1eed l\u00fd. T\u1ed1c \u0111\u1ed9 tr\u1edf th\u00e0nh m\u1ed9t b\u1ea5t l\u1ee3i.<\/p>\n<p>ICCB l\u00e0 thi\u1ebft b\u1ecb Lo\u1ea1i B\u2014\u0111\u01b0\u1ee3c thi\u1ebft k\u1ebf \u0111\u1eb7c bi\u1ec7t \u0111\u1ec3 ch\u1ecdn l\u1ecdc \u1edf \u0111\u1ea7u h\u1ec7 th\u1ed1ng ph\u00e2n ph\u1ed1i. <strong>K\u1ebb Gi\u1ebft Ng\u01b0\u1eddi H\u00e0ng Lo\u1ea1t<\/strong> \u0110\u1ecbnh m\u1ee9c Icw cho ch\u00fang <strong>C\u1eeda S\u1ed5 Ch\u1edd v\u00e0 Xem<\/strong>: kh\u1ea3 n\u0103ng mang d\u00f2ng \u0111i\u1ec7n s\u1ef1 c\u1ed1 l\u1edbn trong 0,05-1,0 gi\u00e2y m\u00e0 kh\u00f4ng b\u1ecb ng\u1eaft, cho ph\u00e9p c\u00e1c b\u1ed9 ng\u1eaft m\u1ea1ch h\u1ea1 ngu\u1ed3n x\u00f3a l\u1ed7i tr\u01b0\u1edbc. C\u00e1c b\u1ed9 ng\u1eaft LSIG ti\u00ean ti\u1ebfn cung c\u1ea5p c\u00e1c \u0111\u01b0\u1eddng cong b\u1ea3o v\u1ec7 ch\u00ednh x\u00e1c, c\u00f3 th\u1ec3 \u0111i\u1ec1u ch\u1ec9nh. C\u1ea5u tr\u00fac m\u00f4-\u0111un cho ph\u00e9p b\u1ea3o tr\u00ec t\u1ea1i ch\u1ed7 thay v\u00ec thay th\u1ebf ho\u00e0n to\u00e0n.<\/p>\n<p>M\u1ee9c ph\u00ed b\u1ea3o hi\u1ec3m? 6.000-10.000 \u0111\u00f4 la cho m\u1ed9t b\u1ed9 ng\u1eaft m\u1ea1ch \u0111\u1ea7u v\u00e0o ch\u00ednh \u0111i\u1ec3n h\u00ecnh.<\/p>\n<p>Ph\u1ea7n th\u01b0\u1edfng? Kh\u00f4ng l\u00e0m ng\u1eaft to\u00e0n b\u1ed9 c\u01a1 s\u1edf c\u1ee7a b\u1ea1n khi B\u1ea3ng 3B c\u00f3 l\u1ed7i.<\/p>\n<p>\u0110\u00e2y l\u00e0 khu\u00f4n kh\u1ed5 quy\u1ebft \u0111\u1ecbnh:<\/p>\n<ul>\n<li><strong>B\u1ed9 ng\u1eaft m\u1ea1ch d\u1ecbch v\u1ee5 \u0111\u1ea7u v\u00e0o ch\u00ednh:<\/strong> ICCB. Kh\u00f4ng th\u1ec3 th\u01b0\u01a1ng l\u01b0\u1ee3ng n\u1ebfu b\u1ea1n quan t\u00e2m \u0111\u1ebfn th\u1eddi gian ho\u1ea1t \u0111\u1ed9ng.<\/li>\n<li><strong>C\u00e1c \u0111\u01b0\u1eddng d\u00e2y c\u1ea5p ngu\u1ed3n quan tr\u1ecdng (trung t\u00e2m d\u1eef li\u1ec7u, b\u1ec7nh vi\u1ec7n, quy tr\u00ecnh li\u00ean t\u1ee5c):<\/strong> ICCB. <strong>Thu\u1ebf ch\u1ecdn l\u1ecdc<\/strong> t\u1eeb m\u1ed9t s\u1ef1 c\u1ed1 t\u1ea7ng v\u01b0\u1ee3t qu\u00e1 ph\u00ed b\u1ea3o hi\u1ec3m c\u1ee7a b\u1ed9 ng\u1eaft m\u1ea1ch.<\/li>\n<li><strong>Ph\u00e2n ph\u1ed1i ph\u1ee5 v\u00e0 \u0111\u01b0\u1eddng d\u00e2y c\u1ea5p ngu\u1ed3n ti\u00eau chu\u1ea9n:<\/strong> MCCB th\u01b0\u1eddng \u0111\u1ee7 tr\u1eeb khi nghi\u00ean c\u1ee9u ph\u1ed1i h\u1ee3p ti\u1ebft l\u1ed9 c\u00e1c v\u1ea5n \u0111\u1ec1.<\/li>\n<li><strong>M\u1ea1ch nh\u00e1nh d\u01b0\u1edbi 400A:<\/strong> MCCB. Hi\u1ec7u qu\u1ea3 v\u1ec1 chi ph\u00ed v\u00e0 ph\u00f9 h\u1ee3p.<\/li>\n<\/ul>\n<p>V\u00e0 n\u1ebfu b\u1ea1n v\u1eabn c\u00f2n do d\u1ef1 v\u1ec1 ph\u00ed b\u1ea3o hi\u1ec3m ICCB 8.000 \u0111\u00f4 la \u0111\u00f3, h\u00e3y xem x\u00e9t \u0111i\u1ec1u n\u00e0y: C\u00e2u h\u1ecfi kh\u00f4ng ph\u1ea3i l\u00e0 \u201cT\u00f4i c\u00f3 \u0111\u1ee7 kh\u1ea3 n\u0103ng mua m\u1ed9t ICCB kh\u00f4ng?\u201d<\/p>\n<p>M\u00e0 l\u00e0 \u201cT\u00f4i c\u00f3 \u0111\u1ee7 kh\u1ea3 n\u0103ng cho m\u1ed9t l\u1ea7n m\u1ea5t \u0111i\u1ec7n 124.000 \u0111\u00f4 la n\u1eefa kh\u00f4ng?\u201d<\/p>\n<p>Xem x\u00e9t th\u00f4ng s\u1ed1 k\u1ef9 thu\u1eadt c\u1ee7a b\u1ed9 ng\u1eaft m\u1ea1ch \u0111\u1ea7u v\u00e0o ch\u00ednh c\u1ee7a b\u1ea1n ngay h\u00f4m nay. N\u1ebfu \u0111\u00f3 l\u00e0 MCCB v\u00e0 b\u1ea1n kh\u00f4ng c\u00f3 \u0111\u1ecbnh m\u1ee9c Icw, b\u1ea1n ch\u1ec9 c\u00f2n c\u00e1ch m\u1ed9t l\u1ed7i h\u1ea1 ngu\u1ed3n m\u1ed9t kho\u1ea3n thanh to\u00e1n <strong>Thu\u1ebf ch\u1ecdn l\u1ecdc<\/strong>. L\u1ea7n n\u1eefa.<\/p>\n<p><strong>Ng\u1eebng tr\u1ea3 Thu\u1ebf Ch\u1ecdn L\u1ecdc. \u0110\u1ea7u t\u01b0 v\u00e0o K\u1ebb H\u1ee7y Di\u1ec7t T\u1ea7ng.<\/strong> Th\u1eddi gian ho\u1ea1t \u0111\u1ed9ng c\u1ee7a c\u01a1 s\u1edf b\u1ea1n ph\u1ee5 thu\u1ed9c v\u00e0o n\u00f3.<\/p>\n<\/section>\n<\/div>","protected":false},"excerpt":{"rendered":"<p>You&#8217;re speccing the main incoming breaker for a new 2MW manufacturing facility. Budget says MCCB\u2014saves $7,000 over an ICCB. Your gut says something&#8217;s wrong, but you can&#8217;t quite put your finger on it. You sign off on the MCCB. Six months later: 2:47 AM. A loose connection in Panel 3B arc-faults. In 83 milliseconds, the [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":20200,"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-20187","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-blog"],"_links":{"self":[{"href":"https:\/\/test.viox.com\/vi\/wp-json\/wp\/v2\/posts\/20187","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/test.viox.com\/vi\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/test.viox.com\/vi\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/test.viox.com\/vi\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/test.viox.com\/vi\/wp-json\/wp\/v2\/comments?post=20187"}],"version-history":[{"count":8,"href":"https:\/\/test.viox.com\/vi\/wp-json\/wp\/v2\/posts\/20187\/revisions"}],"predecessor-version":[{"id":20202,"href":"https:\/\/test.viox.com\/vi\/wp-json\/wp\/v2\/posts\/20187\/revisions\/20202"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/test.viox.com\/vi\/wp-json\/wp\/v2\/media\/20200"}],"wp:attachment":[{"href":"https:\/\/test.viox.com\/vi\/wp-json\/wp\/v2\/media?parent=20187"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/test.viox.com\/vi\/wp-json\/wp\/v2\/categories?post=20187"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/test.viox.com\/vi\/wp-json\/wp\/v2\/tags?post=20187"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}