{"id":21474,"date":"2026-01-28T18:23:42","date_gmt":"2026-01-28T10:23:42","guid":{"rendered":"https:\/\/viox.com\/?p=21474"},"modified":"2026-01-28T18:23:46","modified_gmt":"2026-01-28T10:23:46","slug":"mccb-short-time-delay-icw-rating-explained","status":"publish","type":"post","link":"https:\/\/test.viox.com\/vi\/mccb-short-time-delay-icw-rating-explained\/","title":{"rendered":"T\u1ea1i sao MCCB cung c\u1ea5p b\u1ea3o v\u1ec7 tr\u1ec5 ng\u1eafn m\u00e0 kh\u00f4ng c\u00f3 d\u00f2ng ch\u1ecbu \u0111\u1ef1ng ng\u1eafn h\u1ea1n \u0111\u1ecbnh m\u1ee9c (I\u00b2t)?<sub>Icw<\/sub>)"},"content":{"rendered":"<div class=\"product-intro\">\n<figure style=\"text-align: center; margin: 20px 0;\"><img decoding=\"async\" style=\"max-width: 100%; height: auto;\" src=\"https:\/\/img.viox.com\/MCCB-electronic-trip-unit-in-industrial-panel-showing-400A-rating-and-current-display.webp\" alt=\"MCCB electronic trip unit in industrial panel showing 400A rating and current display - VIOX Electric\" \/><figcaption style=\"font-style: italic; color: #555; margin-top: 8px;\">B\u1ed9 ng\u1eaft \u0111i\u1ec7n t\u1eed MCCB trong t\u1ee7 \u0111i\u1ec7n c\u00f4ng nghi\u1ec7p hi\u1ec3n th\u1ecb \u0111\u1ecbnh m\u1ee9c 400A v\u00e0 m\u00e0n h\u00ecnh hi\u1ec3n th\u1ecb d\u00f2ng \u0111i\u1ec7n \u2013 VIOX Electric<\/figcaption><\/figure>\n<h2>Tr\u1ea3 l\u1eddi tr\u1ef1c ti\u1ebfp<\/h2>\n<p><strong><a href=\"https:\/\/test.viox.com\/vi\/mccb\/\">Aptomat v\u1ecf \u0111\u00fac (MCCB)<\/a> c\u00f3 th\u1ec3 cung c\u1ea5p b\u1ea3o v\u1ec7 tr\u1ec5 ng\u1eafn m\u1ea1ch m\u00e0 kh\u00f4ng c\u1ea7n d\u00f2ng \u0111i\u1ec7n ch\u1ecbu \u0111\u1ef1ng ng\u1eafn m\u1ea1ch \u0111\u1ecbnh m\u1ee9c (I<sub>Icw<\/sub>) v\u00ec ch\u00fang thu\u1ed9c IEC 60947-2 Lo\u1ea1i A, trong \u0111\u00f3 t\u00ednh ch\u1ecdn l\u1ecdc \u0111\u1ea1t \u0111\u01b0\u1ee3c th\u00f4ng qua c\u00f4ng ngh\u1ec7 h\u1ea1n ch\u1ebf d\u00f2ng \u0111i\u1ec7n thay v\u00ec tr\u1ec5 th\u1eddi gian c\u00f3 ch\u1ee7 \u00fd.<\/strong> Kh\u00f4ng gi\u1ed1ng nh\u01b0 M\u00e1y c\u1eaft kh\u00f4ng kh\u00ed (ACB) Lo\u1ea1i B \u201cch\u1edd\u201d d\u00f2ng \u0111i\u1ec7n s\u1ef1 c\u1ed1 b\u1eb1ng c\u00e1ch s\u1eed d\u1ee5ng I<sub>Icw<\/sub> cao, MCCB s\u1eed d\u1ee5ng l\u1ef1c \u0111\u1ea9y ti\u1ebfp x\u00fac \u0111i\u1ec7n t\u1eeb v\u00e0 ng\u1eaft h\u1ed3 quang c\u1ef1c nhanh \u0111\u1ec3 h\u1ea1n ch\u1ebf n\u0103ng l\u01b0\u1ee3ng s\u1ef1 c\u1ed1\u2014b\u1ea3o v\u1ec7 ch\u00fang \u0111\u1ed3ng th\u1eddi ph\u1ed1i h\u1ee3p v\u1edbi c\u00e1c thi\u1ebft b\u1ecb h\u1ea1 ngu\u1ed3n th\u00f4ng qua c\u00e1c \u0111\u1eb7c t\u00ednh tr\u1ec5 ng\u1eafn v\u1ed1n c\u00f3 c\u1ee7a ch\u00fang (th\u01b0\u1eddng l\u00e0 10-12\u00d7 I<sub>n<\/sub>) d\u01b0\u1edbi ng\u01b0\u1ee1ng ng\u1eaft t\u1ee9c th\u1eddi.<\/p>\n<hr \/>\n<h2>Nh\u1eefng \u0111i\u1ec3m ch\u00ednh<\/h2>\n<ul>\n<li>\u2705 <strong>Lo\u1ea1i A so v\u1edbi B<\/strong>: MCCB (Lo\u1ea1i A) thi\u1ebfu I<sub>Icw<\/sub> \u0111\u01b0\u1ee3c khai b\u00e1o nh\u01b0ng c\u00f3 kh\u1ea3 n\u0103ng ch\u1ecbu \u0111\u1ef1ng ng\u1eafn m\u1ea1ch v\u1ed1n c\u00f3 d\u01b0\u1edbi ng\u01b0\u1ee1ng \u0111\u1ea9y ti\u1ebfp x\u00fac c\u1ee7a ch\u00fang (th\u01b0\u1eddng &gt;12-14\u00d7 I<sub>n<\/sub>)<\/li>\n<li>\u2705 <strong>V\u1eadt l\u00fd H\u1ea1n ch\u1ebf D\u00f2ng \u0111i\u1ec7n<\/strong>: \u00c1p su\u1ea5t l\u00f2 xo ti\u1ebfp x\u00fac c\u1ed1 \u00fd th\u1ea5p trong MCCB \u0111\u1ec3 cho ph\u00e9p l\u1ef1c \u0111\u1ea9y \u0111i\u1ec7n t\u1eeb nhanh ch\u00f3ng \u1edf d\u00f2ng \u0111i\u1ec7n s\u1ef1 c\u1ed1 cao (&gt;25\u00d7 I<sub>n<\/sub>), ng\u0103n ng\u1eeba h\u01b0 h\u1ecfng th\u00f4ng qua ng\u1eaft nhanh thay v\u00ec ch\u1ecbu \u0111\u1ef1ng k\u00e9o d\u00e0i<\/li>\n<li>\u2705 <strong>Th\u1ef1c t\u1ebf Tr\u1ec5 Ng\u1eafn<\/strong>: C\u00e0i \u0111\u1eb7t tr\u1ec5 ng\u1eafn c\u1ee7a MCCB (v\u00ed d\u1ee5: 10\u00d7 I<sub>n<\/sub>, 0,4 gi\u00e2y) ch\u1ec9 ho\u1ea1t \u0111\u1ed9ng khi d\u00f2ng \u0111i\u1ec7n s\u1ef1 c\u1ed1 duy tr\u00ec d\u01b0\u1edbi ng\u01b0\u1ee1ng ng\u1eaft t\u1ee9c th\u1eddi\u2014v\u01b0\u1ee3t qu\u00e1 ng\u01b0\u1ee1ng n\u00e0y s\u1ebd k\u00edch ho\u1ea1t h\u00e0nh \u0111\u1ed9ng ngay l\u1eadp t\u1ee9c th\u00f4ng qua ng\u1eaft t\u1eeb t\u00ednh ho\u1eb7c c\u01a1 ch\u1ebf d\u1ef1a tr\u00ean n\u0103ng l\u01b0\u1ee3ng<\/li>\n<li>\u2705 <strong>H\u1ea1n ch\u1ebf Ch\u1ecdn l\u1ecdc<\/strong>: T\u00ednh ch\u1ecdn l\u1ecdc ho\u00e0n to\u00e0n gi\u1eefa c\u00e1c MCCB \u0111\u00f2i h\u1ecfi b\u1ea3ng ph\u1ed1i h\u1ee3p c\u1ea9n th\u1eadn; Th\u00e1c ACB-to-MCCB \u0111\u1ea1t \u0111\u01b0\u1ee3c k\u1ebft qu\u1ea3 t\u1ed1t h\u01a1n v\u00ec ACB c\u00f3 th\u1ec3 th\u1ef1c s\u1ef1 tr\u1ec5 (kh\u1ea3 n\u0103ng I<sub>Icw<\/sub> = I<sub>Icu<\/sub> ) trong khi MCCB x\u1eed l\u00fd c\u00e1c s\u1ef1 c\u1ed1 h\u1ea1 ngu\u1ed3n<\/li>\n<li>\u2705 <strong>Ghi \u0111\u00e8 An to\u00e0n<\/strong>: MCCB ti\u00ean ti\u1ebfn v\u1edbi c\u00e1c chuy\u1ebfn \u0111i t\u1ee9c th\u1eddi c\u00f3 th\u1ec3 b\u1ecb v\u00f4 hi\u1ec7u h\u00f3a (v\u00ed d\u1ee5: Schneider NSX) k\u1ebft h\u1ee3p c\u00e1c ch\u1ee9c n\u0103ng \u201cchuy\u1ebfn \u0111i n\u0103ng l\u01b0\u1ee3ng\u201d ho\u1eb7c \u201cghi \u0111\u00e8 t\u1ee9c th\u1eddi\u201d\u2014n\u1ebfu d\u00f2ng \u0111i\u1ec7n s\u1ef1 c\u1ed1 v\u01b0\u1ee3t qu\u00e1 ~25\u00d7 I<sub>n<\/sub>, c\u00e1c c\u01a1 ch\u1ebf ho\u1ea1t \u0111\u1ed9ng b\u1eb1ng kh\u00ed \u0111\u1ed1t bu\u1ed9c ph\u1ea3i ng\u1eaft ngay l\u1eadp t\u1ee9c b\u1ea5t k\u1ec3 c\u00e0i \u0111\u1eb7t<\/li>\n<\/ul>\n<hr \/>\n<h2>T\u00ecm hi\u1ec3u v\u1ec1 Danh m\u1ee5c Ch\u1ecdn l\u1ecdc IEC 60947-2<\/h2>\n<figure style=\"text-align: center; margin: 20px 0;\"><img decoding=\"async\" style=\"max-width: 100%; height: auto;\" src=\"https:\/\/img.viox.com\/Size-and-construction-comparison-between-ACB-with-Icw-rating-and-compact-MCCB-Category-A-breaker.webp\" alt=\"Size and construction comparison between ACB with Icw rating and compact MCCB Category A breaker - VIOX Electric\" \/><figcaption style=\"font-style: italic; color: #555; margin-top: 8px;\">So s\u00e1nh k\u00edch th\u01b0\u1edbc v\u00e0 c\u1ea5u t\u1ea1o gi\u1eefa ACB v\u1edbi \u0111\u1ecbnh m\u1ee9c Icw v\u00e0 b\u1ed9 ng\u1eaft MCCB Lo\u1ea1i A nh\u1ecf g\u1ecdn \u2013 VIOX Electric<\/figcaption><\/figure>\n<h3>Lo\u1ea1i B: ACB v\u1edbi I \u0111\u01b0\u1ee3c khai b\u00e1o<sub>Icw<\/sub><\/h3>\n<p>M\u00e1y c\u1eaft kh\u00f4ng kh\u00ed (ACB) \u0111\u01b0\u1ee3c thi\u1ebft k\u1ebf cho <strong>Lo\u1ea1i B<\/strong> c\u00e1c \u1ee9ng d\u1ee5ng trong \u0111\u00f3 t\u00ednh ch\u1ecdn l\u1ecdc \u0111\u1ea1t \u0111\u01b0\u1ee3c th\u00f4ng qua tr\u1ec5 ng\u1eafn m\u1ea1ch c\u00f3 ch\u1ee7 \u00fd. Theo IEC 60947-2, c\u00e1c thi\u1ebft b\u1ecb n\u00e0y ph\u1ea3i khai b\u00e1o d\u00f2ng \u0111i\u1ec7n ch\u1ecbu \u0111\u1ef1ng ng\u1eafn m\u1ea1ch \u0111\u1ecbnh m\u1ee9c (I<sub>Icw<\/sub>)\u2014d\u00f2ng \u0111i\u1ec7n s\u1ef1 c\u1ed1 t\u1ed1i \u0111a m\u00e0 b\u1ed9 ng\u1eaft c\u00f3 th\u1ec3 mang \u1edf v\u1ecb tr\u00ed \u0111\u00f3ng trong m\u1ed9t kho\u1ea3ng th\u1eddi gian x\u00e1c \u0111\u1ecbnh (0,05 gi\u00e2y, 0,1 gi\u00e2y, 0,25 gi\u00e2y, 0,5 gi\u00e2y ho\u1eb7c 1,0 gi\u00e2y) m\u00e0 kh\u00f4ng b\u1ecb h\u01b0 h\u1ea1i.<\/p>\n<p><strong>C\u00e1c \u0111\u1eb7c \u0111i\u1ec3m ch\u00ednh c\u1ee7a b\u1ed9 ng\u1eaft Lo\u1ea1i B:<\/strong><\/p>\n<table style=\"border-collapse: collapse; width: 100%; margin: 20px 0;\" border=\"1\" cellpadding=\"10\">\n<thead>\n<tr style=\"background-color: #f2f2f2;\">\n<th>Tham s\u1ed1<\/th>\n<th>\u0110\u1eb7c \u0111i\u1ec3m k\u1ef9 thu\u1eadt<\/th>\n<th>M\u1ee5c \u0111\u00edch<\/th>\n<\/tr>\n<\/thead>\n<tbody>\n<tr>\n<td><strong>T\u00f4i<sub>Icw<\/sub> X\u1ebfp h\u1ea1ng<\/strong><\/td>\n<td>T\u1ed1i thi\u1ec3u 12\u00d7 I<sub>n<\/sub> ho\u1eb7c 5kA (khung \u22642500A)<br \/>\nT\u1ed1i thi\u1ec3u 30kA (khung &gt;2500A)<\/td>\n<td>Cho ph\u00e9p tr\u1ec5 c\u00f3 ch\u1ee7 \u00fd trong qu\u00e1 tr\u00ecnh x\u1ea3y ra s\u1ef1 c\u1ed1<\/td>\n<\/tr>\n<tr>\n<td><strong>Thi\u1ebft k\u1ebf li\u00ean h\u1ec7<\/strong><\/td>\n<td>\u00c1p su\u1ea5t l\u00f2 xo cao<\/td>\n<td>Ng\u0103n ch\u1eb7n l\u1ef1c \u0111\u1ea9y ti\u1ebfp x\u00fac trong giai \u0111o\u1ea1n tr\u1ec5<\/td>\n<\/tr>\n<tr>\n<td><strong>Kh\u1ea3 n\u0103ng tr\u00ec ho\u00e3n chuy\u1ebfn \u0111i<\/strong><\/td>\n<td>C\u00f3 th\u1ec3 t\u1eaft chuy\u1ebfn \u0111i t\u1ee9c th\u1eddi<\/td>\n<td>Cho ph\u00e9p ph\u1ed1i h\u1ee3p d\u1ef1a tr\u00ean th\u1eddi gian thu\u1ea7n t\u00fay<\/td>\n<\/tr>\n<tr>\n<td><strong>\u0110i\u1ec3n H\u00ecnh D\u1ee5ng<\/strong><\/td>\n<td>Ngu\u1ed3n c\u1ea5p ch\u00ednh, ngu\u1ed3n c\u1ea5p ph\u00e2n ph\u1ed1i<\/td>\n<td>Ph\u1ed1i h\u1ee3p v\u1edbi MCCB h\u1ea1 ngu\u1ed3n<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<p>V\u00ed d\u1ee5: ACB 800A v\u1edbi I<sub>Icw<\/sub> = 85kA\/1s c\u00f3 th\u1ec3 ch\u1ecbu \u0111\u01b0\u1ee3c d\u00f2ng \u0111i\u1ec7n s\u1ef1 c\u1ed1 85kA trong t\u1ed1i \u0111a 1 gi\u00e2y trong khi r\u01a1le tr\u1ec5 ng\u1eafn m\u1ea1ch \u201cch\u1edd\u201d c\u00e1c thi\u1ebft b\u1ecb h\u1ea1 ngu\u1ed3n x\u00f3a s\u1ef1 c\u1ed1. Kh\u1ea3 n\u0103ng n\u00e0y \u0111\u00f2i h\u1ecfi c\u1ea5u tr\u00fac c\u01a1 h\u1ecdc m\u1ea1nh m\u1ebd\u2014tay ti\u1ebfp x\u00fac \u0111\u01b0\u1ee3c gia c\u1ed1, \u00e1p su\u1ea5t ti\u1ebfp x\u00fac cao (ng\u0103n ch\u1eb7n l\u1ef1c \u0111\u1ea9y \u0111i\u1ec7n t\u1eeb) v\u00e0 kh\u1ed1i nhi\u1ec7t \u0111\u1ec3 h\u1ea5p th\u1ee5 n\u0103ng l\u01b0\u1ee3ng I<sup>2<\/sup>t.<\/p>\n<h3>Lo\u1ea1i A: MCCB kh\u00f4ng c\u00f3 I \u0111\u01b0\u1ee3c khai b\u00e1o<sub>Icw<\/sub><\/h3>\n<p>M\u00e1y c\u1eaft v\u1ecf \u0111\u00fac (MCCB) th\u01b0\u1eddng thu\u1ed9c <strong>Lo\u1ea1i A<\/strong>\u2014c\u00e1c thi\u1ebft b\u1ecb \u201ckh\u00f4ng \u0111\u1eb7c bi\u1ec7t d\u00e0nh cho t\u00ednh ch\u1ecdn l\u1ecdc trong \u0111i\u1ec1u ki\u1ec7n ng\u1eafn m\u1ea1ch\u201d theo IEC 60947-2. C\u00e1c b\u1ed9 ng\u1eaft n\u00e0y kh\u00f4ng khai b\u00e1o I<sub>Icw<\/sub> v\u00ec tri\u1ebft l\u00fd thi\u1ebft k\u1ebf c\u1ee7a h\u1ecd \u01b0u ti\u00ean <strong>ng\u1eaft s\u1ef1 c\u1ed1 nhanh ch\u00f3ng<\/strong> so v\u1edbi ch\u1ecbu \u0111\u1ef1ng s\u1ef1 c\u1ed1 k\u00e9o d\u00e0i.<\/p>\n<p><strong>T\u1ea1i sao MCCB kh\u00f4ng khai b\u00e1o I<sub>Icw<\/sub>:<\/strong><\/p>\n<ol>\n<li><strong>Thi\u1ebft k\u1ebf H\u1ea1n ch\u1ebf D\u00f2ng \u0111i\u1ec7n<\/strong>: \u00c1p su\u1ea5t l\u00f2 xo ti\u1ebfp x\u00fac c\u1ed1 \u00fd th\u1ea5p \u0111\u1ec3 t\u1ea1o \u0111i\u1ec1u ki\u1ec7n cho l\u1ef1c \u0111\u1ea9y \u0111i\u1ec7n t\u1eeb nhanh ch\u00f3ng khi d\u00f2ng \u0111i\u1ec7n s\u1ef1 c\u1ed1 v\u01b0\u1ee3t qu\u00e1 ~10-14\u00d7 I<sub>n<\/sub><\/li>\n<li><strong>B\u1eaft bu\u1ed9c Ng\u1eaft T\u1ee9c th\u1eddi<\/strong>: H\u1ea7u h\u1ebft MCCB kh\u00f4ng th\u1ec3 t\u1eaft b\u1ea3o v\u1ec7 t\u1ee9c th\u1eddi\u2014b\u1ea5t k\u1ef3 s\u1ef1 c\u1ed1 n\u00e0o v\u01b0\u1ee3t qu\u00e1 ng\u01b0\u1ee1ng t\u1ee9c th\u1eddi s\u1ebd k\u00edch ho\u1ea1t ng\u1eaft ngay l\u1eadp t\u1ee9c<\/li>\n<li><strong>H\u1ea1n ch\u1ebf v\u1ec1 Nhi\u1ec7t<\/strong>: C\u1ea5u tr\u00fac \u0111\u00fac nh\u1ecf g\u1ecdn kh\u00f4ng th\u1ec3 ti\u00eau t\u00e1n n\u0103ng l\u01b0\u1ee3ng nhi\u1ec7t (I<sup>2<\/sup>t) li\u00ean quan \u0111\u1ebfn kh\u1ea3 n\u0103ng ch\u1ecbu \u0111\u1ef1ng d\u00f2ng \u0111i\u1ec7n cao k\u00e9o d\u00e0i<\/li>\n<\/ol>\n<p>Tuy nhi\u00ean, \u0111i\u1ec1u n\u00e0y kh\u00f4ng <strong>kh\u00f4ng<\/strong> c\u00f3 ngh\u0129a l\u00e0 MCCB ho\u00e0n to\u00e0n thi\u1ebfu kh\u1ea3 n\u0103ng ch\u1ecbu \u0111\u1ef1ng ng\u1eafn m\u1ea1ch\u2014ch\u00fang c\u00f3 m\u1ed9t ng\u01b0\u1ee1ng v\u1ed1n c\u00f3, kh\u00f4ng \u0111\u01b0\u1ee3c khai b\u00e1o m\u00e0 d\u01b0\u1edbi \u0111\u00f3 c\u00e1c ti\u1ebfp \u0111i\u1ec3m v\u1eabn \u0111\u00f3ng.<\/p>\n<hr \/>\n<h2>V\u1eadt l\u00fd c\u1ee7a L\u1ef1c \u0111\u1ea9y Ti\u1ebfp x\u00fac MCCB<\/h2>\n<figure style=\"text-align: center; margin: 20px 0;\"><img decoding=\"async\" style=\"max-width: 100%; height: auto;\" src=\"https:\/\/img.viox.com\/MCCB-electromagnetic-contact-repulsion-mechanism-diagram-showing-force-balance-and-current-thresholds.webp\" alt=\"MCCB electromagnetic contact repulsion mechanism diagram showing force balance and current thresholds - VIOX Electric\" \/><figcaption style=\"font-style: italic; color: #555; margin-top: 8px;\">S\u01a1 \u0111\u1ed3 c\u01a1 ch\u1ebf \u0111\u1ea9y ti\u1ebfp x\u00fac \u0111i\u1ec7n t\u1eeb MCCB hi\u1ec3n th\u1ecb c\u00e2n b\u1eb1ng l\u1ef1c v\u00e0 ng\u01b0\u1ee1ng d\u00f2ng \u0111i\u1ec7n \u2013 VIOX Electric<\/figcaption><\/figure>\n<h3>Ng\u01b0\u1ee1ng \u0110\u1ea9y \u0110i\u1ec7n t\u1eeb<\/h3>\n<p>Khi d\u00f2ng \u0111i\u1ec7n s\u1ef1 c\u1ed1 ch\u1ea1y qua c\u00e1c \u0111\u01b0\u1eddng d\u1eabn ti\u1ebfp x\u00fac song song trong MCCB, n\u00f3 t\u1ea1o ra c\u00e1c tr\u01b0\u1eddng t\u1eeb \u0111\u1ed1i l\u1eadp t\u1ea1o ra <strong>l\u1ef1c \u0111\u1ea9y \u0111i\u1ec7n \u0111\u1ed9ng<\/strong> (l\u1ef1c Lorentz). L\u00f2 xo ti\u1ebfp x\u00fac ph\u1ea3i ch\u1ed1ng l\u1ea1i l\u1ef1c n\u00e0y \u0111\u1ec3 gi\u1eef cho c\u00e1c ti\u1ebfp \u0111i\u1ec3m \u0111\u00f3ng.<\/p>\n<p><strong>Ph\u01b0\u01a1ng tr\u00ecnh c\u00e2n b\u1eb1ng l\u1ef1c:<\/strong><\/p>\n<p style=\"text-align: center; background-color: #f9f9f9; padding: 10px; border-radius: 4px;\">F<sub>l\u00f2 xo<\/sub> &gt; F<sub>\u0111\u1ea9y<\/sub> = k \u00b7 I<sup>2<\/sup><\/p>\n<p>N\u01a1i:<\/p>\n<ul>\n<li>F<sub>l\u00f2 xo<\/sub> = L\u1ef1c n\u00e9n c\u1ee7a l\u00f2 xo ti\u1ebfp x\u00fac<\/li>\n<li>F<sub>\u0111\u1ea9y<\/sub> = L\u1ef1c \u0111\u1ea9y \u0111i\u1ec7n t\u1eeb (t\u1ef7 l\u1ec7 v\u1edbi I<sup>2<\/sup>)<\/li>\n<li>k = H\u1eb1ng s\u1ed1 h\u00ecnh h\u1ecdc (kho\u1ea3ng c\u00e1ch ti\u1ebfp x\u00fac, c\u1ea5u h\u00ecnh d\u00e2y d\u1eabn)<\/li>\n<\/ul>\n<table style=\"border-collapse: collapse; width: 100%; margin: 20px 0;\" border=\"1\" cellpadding=\"10\">\n<thead>\n<tr style=\"background-color: #f2f2f2;\">\n<th>Th\u00f4ng s\u1ed1 thi\u1ebft k\u1ebf MCCB<\/th>\n<th>Lo\u1ea1i A (MCCB)<\/th>\n<th>Lo\u1ea1i B (ACB)<\/th>\n<\/tr>\n<\/thead>\n<tbody>\n<tr>\n<td><strong>\u00c1p su\u1ea5t l\u00f2 xo ti\u1ebfp x\u00fac<\/strong><\/td>\n<td>Th\u1ea5p (2-5 N\/mm)<\/td>\n<td>Cao (10-20 N\/mm)<\/td>\n<\/tr>\n<tr>\n<td><strong>Ng\u01b0\u1ee1ng l\u1ef1c \u0111\u1ea9y<\/strong><\/td>\n<td>12-14\u00d7 I<sub>n<\/sub><\/td>\n<td>&gt;50\u00d7 I<sub>n<\/sub><\/td>\n<\/tr>\n<tr>\n<td><strong>T\u1ed1c \u0111\u1ed9 m\u1edf ti\u1ebfp \u0111i\u1ec3m<\/strong><\/td>\n<td>3-7 ms (si\u00eau nhanh)<\/td>\n<td>20-50 ms (ki\u1ec3m so\u00e1t)<\/td>\n<\/tr>\n<tr>\n<td><strong>Thi\u1ebft K\u1ebf \u01afu Ti\u00ean<\/strong><\/td>\n<td>Gi\u1edbi h\u1ea1n n\u0103ng l\u01b0\u1ee3ng s\u1ef1 c\u1ed1 (I<sup>2<\/sup>t)<\/td>\n<td>Ch\u1ecbu \u0111\u01b0\u1ee3c th\u1eddi gian s\u1ef1 c\u1ed1<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<h3>Nh\u1eefng c\u00e2n nh\u1eafc khi kh\u1edfi \u0111\u1ed9ng \u0111\u1ed9ng c\u01a1<\/h3>\n<p>Nghi\u00ean c\u1ee9u c\u1ee7a Vi\u1ec7n Nghi\u00ean c\u1ee9u \u0110i\u1ec7n Th\u01b0\u1ee3ng H\u1ea3i tr\u00ean 52 m\u1eabu \u0111\u1ed9ng c\u01a1 cho th\u1ea5y kh\u1edfi \u0111\u1ed9ng tr\u1ef1c ti\u1ebfp (DOL) t\u1ea1o ra d\u00f2ng \u0111i\u1ec7n kh\u1edfi \u0111\u1ed9ng \u0111\u1ec9nh \u0111\u1ea7u ti\u00ean l\u00e0 <strong>8-12\u00d7 I<sub>n<\/sub><\/strong> cho h\u1ea7u h\u1ebft c\u00e1c \u0111\u1ed9ng c\u01a1, v\u1edbi c\u00e1c tr\u01b0\u1eddng h\u1ee3p ngo\u1ea1i l\u1ec7 \u0111\u1ea1t t\u1edbi 13\u00d7 I<sub>n<\/sub>.<\/p>\n<p><strong>D\u1eef li\u1ec7u n\u00e0y th\u00fac \u0111\u1ea9y c\u00e1c r\u00e0ng bu\u1ed9c thi\u1ebft k\u1ebf MCCB:<\/strong><\/p>\n<ul>\n<li><strong>MCCB ph\u00e2n ph\u1ed1i<\/strong>: Chuy\u1ebfn \u0111i t\u1ee9c th\u1eddi \u0111\u01b0\u1ee3c \u0111\u1eb7t \u1edf 10-12\u00d7 I<sub>n<\/sub> (kh\u00f4ng \u0111\u01b0\u1ee3c ng\u1eaft khi d\u00f2ng \u0111i\u1ec7n kh\u1edfi \u0111\u1ed9ng t\u1ee5 \u0111i\u1ec7n ho\u1eb7c c\u1ea5p \u0111i\u1ec7n cho m\u00e1y bi\u1ebfn \u00e1p)<\/li>\n<li><strong>MCCB \u0111\u1ecbnh m\u1ee9c \u0111\u1ed9ng c\u01a1<\/strong>: Chuy\u1ebfn \u0111i t\u1ee9c th\u1eddi \u0111\u01b0\u1ee3c \u0111\u1eb7t \u1edf 13-14\u00d7 I<sub>n<\/sub> (ph\u1ea3i v\u01b0\u1ee3t qua qu\u00e1 tr\u00ecnh kh\u1edfi \u0111\u1ed9ng DOL)<\/li>\n<li><strong>Ng\u01b0\u1ee1ng l\u1ef1c \u0111\u1ea9y ti\u1ebfp x\u00fac<\/strong>: Ph\u1ea3i v\u01b0\u1ee3t qu\u00e1 c\u00e0i \u0111\u1eb7t ng\u1eaft t\u1ee9c th\u1eddi v\u1edbi bi\u00ean \u0111\u1ed9 15-20% \u0111\u1ec3 ng\u0103n ch\u1eb7n vi\u1ec7c m\u1edf ti\u1ebfp x\u00fac g\u00e2y phi\u1ec1n to\u00e1i trong qu\u00e1 tr\u00ecnh chuy\u1ec3n ti\u1ebfp kh\u1edfi \u0111\u1ed9ng<\/li>\n<\/ul>\n<p><strong>V\u00ed d\u1ee5 t\u00ednh to\u00e1n cho MCCB \u0111\u1ecbnh m\u1ee9c \u0111\u1ed9ng c\u01a1 100A:<\/strong><\/p>\n<div style=\"background-color: #f5f5f5; padding: 15px; border-radius: 5px; margin: 15px 0; font-family: monospace;\">C\u00e0i \u0111\u1eb7t ng\u1eaft t\u1ee9c th\u1eddi: 13 \u00d7 100A = 1.300A<br \/>\nNg\u01b0\u1ee1ng l\u1ef1c \u0111\u1ea9y ti\u1ebfp x\u00fac: 1.300A \u00d7 1,2 = 1.560A (m\u1ee5c ti\u00eau thi\u1ebft k\u1ebf)<br \/>\nKh\u1ea3 n\u0103ng \u201cIcw\u201d kh\u00f4ng \u0111\u01b0\u1ee3c khai b\u00e1o: ~1.500A (d\u01b0\u1edbi ng\u01b0\u1ee1ng l\u1ef1c \u0111\u1ea9y)<\/div>\n<p>Ng\u01b0\u1ee1ng 1.500A n\u00e0y th\u1ec3 hi\u1ec7n kh\u1ea3 n\u0103ng ch\u1ecbu \u0111\u1ef1ng ng\u1eafn m\u1ea1ch v\u1ed1n c\u00f3 c\u1ee7a MCCB\u2014\u0111\u1ee7 \u0111\u1ec3 ph\u1ed1i h\u1ee3p v\u1edbi c\u00e1c thi\u1ebft b\u1ecb h\u1ea1 ngu\u1ed3n trong ph\u1ea1m vi s\u1ef1 c\u1ed1 1.000-1.500A, nh\u01b0ng th\u1ea5p h\u01a1n nhi\u1ec1u so v\u1edbi I<sub>Icw<\/sub> gi\u00e1 tr\u1ecb c\u1ee7a ACB (th\u01b0\u1eddng l\u00e0 30-85kA).<\/p>\n<hr \/>\n<h2>\u0110\u1ed9 tr\u1ec5 ng\u1eafn m\u1ea1ch MCCB th\u1ef1c s\u1ef1 ho\u1ea1t \u0111\u1ed9ng nh\u01b0 th\u1ebf n\u00e0o<\/h2>\n<figure style=\"text-align: center; margin: 20px 0;\"><img decoding=\"async\" style=\"max-width: 100%; height: auto;\" src=\"https:\/\/img.viox.com\/Technical-infographic-clean-202601280514.webp\" alt=\"MCCB three-zone protection logic diagram showing overload, short-time delay, and instantaneous trip thresholds - VIOX Electric\" \/><figcaption style=\"font-style: italic; color: #555; margin-top: 8px;\">S\u01a1 \u0111\u1ed3 logic b\u1ea3o v\u1ec7 ba v\u00f9ng MCCB hi\u1ec3n th\u1ecb c\u00e1c ng\u01b0\u1ee1ng qu\u00e1 t\u1ea3i, tr\u1ec5 ng\u1eafn m\u1ea1ch v\u00e0 ng\u1eaft t\u1ee9c th\u1eddi \u2013 VIOX Electric<\/figcaption><\/figure>\n<h3>Ba v\u00f9ng ho\u1ea1t \u0111\u1ed9ng<\/h3>\n<p>MCCB ng\u1eaft \u0111i\u1ec7n t\u1eed hi\u1ec7n \u0111\u1ea1i c\u00f3 ba v\u00f9ng b\u1ea3o v\u1ec7, nh\u01b0ng s\u1ef1 t\u01b0\u01a1ng t\u00e1c c\u1ee7a ch\u00fang kh\u00e1c v\u1ec1 c\u01a1 b\u1ea3n so v\u1edbi ACB:<\/p>\n<table style=\"border-collapse: collapse; width: 100%; margin: 20px 0;\" border=\"1\" cellpadding=\"10\">\n<thead>\n<tr style=\"background-color: #f2f2f2;\">\n<th>Khu v\u1ef1c b\u1ea3o v\u1ec7<\/th>\n<th>Ph\u1ea1m vi c\u00e0i \u0111\u1eb7t<\/th>\n<th>H\u00e0nh vi th\u1ef1c t\u1ebf<\/th>\n<\/tr>\n<\/thead>\n<tbody>\n<tr>\n<td><strong>D\u00e0i h\u1ea1n (Qu\u00e1 t\u1ea3i)<\/strong><\/td>\n<td>0,4-1,0\u00d7 I<sub>n<\/sub>, 3-30 gi\u00e2y<\/td>\n<td>B\u1ea3o v\u1ec7 nhi\u1ec7t th\u00f4ng qua I<sup>2<\/sup>t\u00ednh to\u00e1n t<\/td>\n<\/tr>\n<tr>\n<td><strong>Tr\u1ec5 ng\u1eafn h\u1ea1n<\/strong><\/td>\n<td>2-12\u00d7 I<sub>n<\/sub>, 0,1-0,5 gi\u00e2y<\/td>\n<td><strong>Ch\u1ec9 ho\u1ea1t \u0111\u1ed9ng d\u01b0\u1edbi ng\u01b0\u1ee1ng t\u1ee9c th\u1eddi<\/strong><\/td>\n<\/tr>\n<tr>\n<td><strong>T\u1ee9c th\u1eddi<\/strong><\/td>\n<td>10-14\u00d7 I<sub>n<\/sub> (c\u1ed1 \u0111\u1ecbnh ho\u1eb7c c\u00f3 th\u1ec3 \u0111i\u1ec1u ch\u1ec9nh)<\/td>\n<td><strong>Kh\u00f4ng th\u1ec3 t\u1eaft trong h\u1ea7u h\u1ebft c\u00e1c MCCB<\/strong><\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<h3>T\u00ecnh hu\u1ed1ng 1: D\u00f2ng \u0111i\u1ec7n s\u1ef1 c\u1ed1 d\u01b0\u1edbi ng\u01b0\u1ee1ng t\u1ee9c th\u1eddi<\/h3>\n<p><strong>\u0110i\u1ec1u ki\u1ec7n<\/strong>: D\u00f2ng \u0111i\u1ec7n s\u1ef1 c\u1ed1 = 8\u00d7 I<sub>n<\/sub> (800A cho b\u1ed9 ng\u1eaft m\u1ea1ch 100A)<\/p>\n<ol>\n<li>D\u00f2ng \u0111i\u1ec7n v\u01b0\u1ee3t qu\u00e1 v\u00f9ng th\u1eddi gian d\u00e0i \u2192 K\u00edch ho\u1ea1t tr\u1ec5 th\u1eddi gian ng\u1eafn<\/li>\n<li>B\u1ed9 ph\u1eadn ng\u1eaft \u0111i\u1ec7n t\u1eed b\u1eaft \u0111\u1ea7u \u0111\u1ebfm ng\u01b0\u1ee3c (v\u00ed d\u1ee5: 0,4 gi\u00e2y)<\/li>\n<li>N\u1ebfu l\u1ed7i v\u1eabn ti\u1ebfp di\u1ec5n, cu\u1ed9n d\u00e2y ng\u1eaft \u0111\u01b0\u1ee3c c\u1ea5p \u0111i\u1ec7n sau th\u1eddi gian tr\u1ec5<\/li>\n<li>C\u00e1c ti\u1ebfp \u0111i\u1ec3m m\u1edf th\u00f4ng qua c\u01a1 ch\u1ebf n\u0103ng l\u01b0\u1ee3ng d\u1ef1 tr\u1eef (th\u1eddi gian m\u1edf ~20-30 ms)<\/li>\n<\/ol>\n<p><strong>Qu\u1ea3<\/strong>: Ph\u1ed1i h\u1ee3p tr\u1ec5 th\u1eddi gian th\u1ef1c v\u1edbi c\u00e1c thi\u1ebft b\u1ecb h\u1ea1 ngu\u1ed3n<\/p>\n<h3>T\u00ecnh hu\u1ed1ng 2: D\u00f2ng \u0111i\u1ec7n s\u1ef1 c\u1ed1 v\u01b0\u1ee3t qu\u00e1 ng\u01b0\u1ee1ng t\u1ee9c th\u1eddi<\/h3>\n<p><strong>\u0110i\u1ec1u ki\u1ec7n<\/strong>: D\u00f2ng \u0111i\u1ec7n s\u1ef1 c\u1ed1 = 15 \u00d7 I<sub>n<\/sub> (1.500A cho b\u1ed9 ng\u1eaft m\u1ea1ch 100A)<\/p>\n<ol>\n<li>D\u00f2ng \u0111i\u1ec7n v\u01b0\u1ee3t qu\u00e1 ng\u01b0\u1ee1ng t\u1ee9c th\u1eddi \u2192 Ng\u1eaft t\u1eeb t\u00ednh t\u00e1c \u0111\u1ed9ng ngay l\u1eadp t\u1ee9c<\/li>\n<li>C\u00e0i \u0111\u1eb7t tr\u1ec5 th\u1eddi gian ng\u1eafn l\u00e0 <strong>\u0111\u01b0\u1ee3c b\u1ecf qua<\/strong><\/li>\n<li>Cu\u1ed9n d\u00e2y ng\u1eaft \u0111\u01b0\u1ee3c c\u1ea5p \u0111i\u1ec7n trong v\u00f2ng 5-10 ms<\/li>\n<li>C\u00e1c ti\u1ebfp \u0111i\u1ec3m m\u1edf ra, nh\u01b0ng d\u00f2ng \u0111i\u1ec7n s\u1ef1 c\u1ed1 c\u00f3 th\u1ec3 \u0111\u00e3 g\u00e2y ra l\u1ef1c \u0111\u1ea9y \u0111i\u1ec7n t\u1eeb<\/li>\n<\/ol>\n<p><strong>Qu\u1ea3<\/strong>: Kh\u00f4ng c\u00f3 \u0111\u1ed9 tr\u1ec5 c\u1ed1 \u00fd\u2014MCCB ng\u1eaft nhanh nh\u1ea5t c\u00f3 th\u1ec3<\/p>\n<h3>T\u00ecnh hu\u1ed1ng 3: D\u00f2ng \u0111i\u1ec7n s\u1ef1 c\u1ed1 v\u01b0\u1ee3t xa ng\u01b0\u1ee1ng \u0111\u1ea9y<\/h3>\n<p><strong>\u0110i\u1ec1u ki\u1ec7n<\/strong>: D\u00f2ng \u0111i\u1ec7n s\u1ef1 c\u1ed1 = 50 \u00d7 I<sub>n<\/sub> (5.000A cho b\u1ed9 ng\u1eaft m\u1ea1ch 100A, g\u1ea7n I<sub>Icu<\/sub>)<\/p>\n<ol>\n<li>L\u1ef1c \u0111\u1ea9y \u0111i\u1ec7n t\u1eeb v\u01b0\u1ee3t qu\u00e1 \u00e1p su\u1ea5t l\u00f2 xo<\/li>\n<li>C\u00e1c ti\u1ebfp \u0111i\u1ec3m bung ra trong v\u00f2ng 3-7 ms (nhanh h\u01a1n c\u01a1 ch\u1ebf ng\u1eaft)<\/li>\n<li>\u0110i\u1ec7n \u00e1p h\u1ed3 quang t\u0103ng nhanh, gi\u1edbi h\u1ea1n d\u00f2ng \u0111i\u1ec7n \u0111\u1ec9nh (t\u00e1c \u0111\u1ed9ng gi\u1edbi h\u1ea1n d\u00f2ng \u0111i\u1ec7n)<\/li>\n<li>N\u0103ng l\u01b0\u1ee3ng h\u1ed3 quang c\u00f3 th\u1ec3 k\u00edch ho\u1ea1t c\u01a1 ch\u1ebf ng\u1eaft, ho\u1eb7c b\u1ed9 ng\u1eaft m\u1ea1ch ch\u1ec9 d\u1ef1a v\u00e0o d\u1eadp t\u1eaft h\u1ed3 quang<\/li>\n<\/ol>\n<p><strong>Qu\u1ea3<\/strong>: Gi\u1edbi h\u1ea1n d\u00f2ng \u0111i\u1ec7n c\u1ef1c nhanh\u2014kh\u00f4ng ph\u1ed1i h\u1ee3p, nh\u01b0ng b\u1ea3o v\u1ec7 thi\u1ebft b\u1ecb th\u00f4ng qua I<sup>2<\/sup>gi\u1ea3m t<\/p>\n<hr \/>\n<h2>Tr\u01b0\u1eddng h\u1ee3p \u0111\u1eb7c bi\u1ec7t: MCCB c\u00f3 th\u1ec3 v\u00f4 hi\u1ec7u h\u00f3a ng\u1eaft t\u1ee9c th\u1eddi<\/h2>\n<h3>C\u01a1 ch\u1ebf \u201cNg\u1eaft n\u0103ng l\u01b0\u1ee3ng\u201d Schneider NSX<\/h3>\n<p>M\u1ed9t s\u1ed1 MCCB cao c\u1ea5p (v\u00ed d\u1ee5: Schneider Electric NSX v\u1edbi b\u1ed9 ph\u1eadn ng\u1eaft Micrologic) cho ph\u00e9p t\u1eaft b\u1ea3o v\u1ec7 t\u1ee9c th\u1eddi \u0111\u1ec3 c\u1ea3i thi\u1ec7n t\u00ednh ch\u1ecdn l\u1ecdc. Tuy nhi\u00ean, c\u00e1c thi\u1ebft b\u1ecb n\u00e0y k\u1ebft h\u1ee3p m\u1ed9t <strong>ghi \u0111\u00e8 an to\u00e0n b\u1eaft bu\u1ed9c<\/strong> \u0111\u01b0\u1ee3c g\u1ecdi l\u00e0 \u201cng\u1eaft n\u0103ng l\u01b0\u1ee3ng\u201d ho\u1eb7c \u201cghi \u0111\u00e8 t\u1ee9c th\u1eddi\u201d.\u201d<\/p>\n<p><strong>C\u00e1ch n\u00f3 ho\u1ea1t \u0111\u1ed9ng:<\/strong><\/p>\n<ol>\n<li>Ng\u01b0\u1eddi d\u00f9ng t\u1eaft ng\u1eaft t\u1ee9c th\u1eddi, b\u1eadt tr\u1ec5 th\u1eddi gian ng\u1eafn (v\u00ed d\u1ee5: 10 \u00d7 I<sub>n<\/sub>, 0,4 gi\u00e2y)<\/li>\n<li>D\u00f2ng \u0111i\u1ec7n s\u1ef1 c\u1ed1 \u0111\u1ea1t 30 \u00d7 I<sub>n<\/sub> (3.000A cho b\u1ed9 ng\u1eaft m\u1ea1ch 100A)<\/li>\n<li>C\u00e1c ti\u1ebfp \u0111i\u1ec3m \u0111\u1ea9y nhau, h\u1ed3 quang h\u00ecnh th\u00e0nh<\/li>\n<li>N\u0103ng l\u01b0\u1ee3ng h\u1ed3 quang ion h\u00f3a v\u1eadt li\u1ec7u t\u1ea1o kh\u00ed trong bu\u1ed3ng h\u1ed3 quang<\/li>\n<li>S\u1ef1 gia t\u0103ng \u00e1p su\u1ea5t k\u00edch ho\u1ea1t c\u01a1 ch\u1ebf ng\u1eaft kh\u00ed n\u00e9n trong v\u00f2ng 10-15 ms<\/li>\n<li>B\u1ed9 ng\u1eaft m\u1ea1ch ng\u1eaft <strong>b\u1ea5t k\u1ec3 c\u00e0i \u0111\u1eb7t b\u1ed9 ph\u1eadn ng\u1eaft \u0111i\u1ec7n t\u1eed<\/strong><\/li>\n<\/ol>\n<table style=\"border-collapse: collapse; width: 100%; margin: 20px 0;\" border=\"1\" cellpadding=\"10\">\n<thead>\n<tr style=\"background-color: #f2f2f2;\">\n<th>M\u1ee9c d\u00f2ng \u0111i\u1ec7n s\u1ef1 c\u1ed1<\/th>\n<th>Ph\u1ea3n h\u1ed3i NSX<\/th>\n<th>Ph\u1ea3n h\u1ed3i MCCB ti\u00eau chu\u1ea9n<\/th>\n<\/tr>\n<\/thead>\n<tbody>\n<tr>\n<td><strong>8 \u00d7 I<sub>n<\/sub><\/strong><\/td>\n<td>Ch\u1ee9c n\u0103ng tr\u1ec5 th\u1eddi gian ng\u1eafn ho\u1ea1t \u0111\u1ed9ng b\u00ecnh th\u01b0\u1eddng<\/td>\n<td>Ch\u1ee9c n\u0103ng tr\u1ec5 th\u1eddi gian ng\u1eafn<\/td>\n<\/tr>\n<tr>\n<td><strong>15 \u00d7 I<sub>n<\/sub><\/strong><\/td>\n<td>Ch\u1ee9c n\u0103ng tr\u1ec5 th\u1eddi gian ng\u1eafn (t\u1eaft t\u1ee9c th\u1eddi)<\/td>\n<td>Ng\u1eaft t\u1ee9c th\u1eddi (kh\u00f4ng th\u1ec3 t\u1eaft)<\/td>\n<\/tr>\n<tr>\n<td><strong>&gt; 25 \u00d7 I<sub>n<\/sub><\/strong><\/td>\n<td>Ng\u1eaft n\u0103ng l\u01b0\u1ee3ng ghi \u0111\u00e8 tr\u1ec5<\/td>\n<td>\u0110\u1ea9y ti\u1ebfp \u0111i\u1ec3m + ng\u1eaft t\u1ee9c th\u1eddi<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<p>Thi\u1ebft k\u1ebf n\u00e0y ng\u0103n ng\u1eeba s\u1ef1 c\u1ed1 th\u1ea3m kh\u1ed1c khi ng\u01b0\u1eddi d\u00f9ng \u0111\u1ecbnh c\u1ea5u h\u00ecnh sai c\u00e0i \u0111\u1eb7t b\u1ea3o v\u1ec7\u2014MCCB s\u1ebd lu\u00f4n t\u1ef1 b\u1ea3o v\u1ec7 \u1edf m\u1ee9c s\u1ef1 c\u1ed1 c\u1ef1c cao, ngay c\u1ea3 khi n\u00f3 \u1ea3nh h\u01b0\u1edfng \u0111\u1ebfn t\u00ednh ch\u1ecdn l\u1ecdc.<\/p>\n<hr \/>\n<h2>C\u00e1c chi\u1ebfn l\u01b0\u1ee3c ph\u1ed1i h\u1ee3p th\u1ef1c t\u1ebf<\/h2>\n<figure style=\"text-align: center; margin: 20px 0;\"><img decoding=\"async\" style=\"max-width: 100%; height: auto;\" src=\"https:\/\/img.viox.com\/Time-current-coordination-diagram-showing-ACB-and-MCCB-selectivity-zones-with-fault-scenario-analysis.webp\" alt=\"Time-current coordination diagram showing ACB and MCCB selectivity zones with fault scenario analysis - VIOX Electric\" \/><figcaption style=\"font-style: italic; color: #555; margin-top: 8px;\">S\u01a1 \u0111\u1ed3 ph\u1ed1i h\u1ee3p th\u1eddi gian-d\u00f2ng \u0111i\u1ec7n hi\u1ec3n th\u1ecb c\u00e1c v\u00f9ng ch\u1ecdn l\u1ecdc ACB v\u00e0 MCCB v\u1edbi ph\u00e2n t\u00edch k\u1ecbch b\u1ea3n s\u1ef1 c\u1ed1 \u2013 VIOX Electric<\/figcaption><\/figure>\n<h3>Chi\u1ebfn l\u01b0\u1ee3c 1: Cascade ACB-to-MCCB (\u0110\u01b0\u1ee3c khuy\u1ebfn ngh\u1ecb)<\/h3>\n<p><strong>C\u1ea5u h\u00ecnh:<\/strong><\/p>\n<ul>\n<li><strong>Th\u01b0\u1ee3ng ngu\u1ed3n<\/strong>: ACB 1600A, I<sub>Icw<\/sub> = 65kA\/0,5s, tr\u1ec5 th\u1eddi gian ng\u1eafn = 0,4s<\/li>\n<li><strong>H\u1ea1 ngu\u1ed3n<\/strong>: MCCB 400A, I<sub>Icu<\/sub> = 50kA, t\u1ee9c th\u1eddi = 5.000A (12,5 \u00d7 I<sub>n<\/sub>)<\/li>\n<\/ul>\n<p><strong>Ph\u00e2n t\u00edch ph\u1ed1i h\u1ee3p:<\/strong><\/p>\n<table style=\"border-collapse: collapse; width: 100%; margin: 20px 0;\" border=\"1\" cellpadding=\"10\">\n<thead>\n<tr style=\"background-color: #f2f2f2;\">\n<th>V\u1ecb tr\u00ed s\u1ef1 c\u1ed1<\/th>\n<th>D\u00f2ng \u0111i\u1ec7n S\u1ef1 c\u1ed1<\/th>\n<th>H\u00e0nh \u0111\u1ed9ng ACB th\u01b0\u1ee3ng ngu\u1ed3n<\/th>\n<th>H\u00e0nh \u0111\u1ed9ng MCCB h\u1ea1 ngu\u1ed3n<\/th>\n<\/tr>\n<\/thead>\n<tbody>\n<tr>\n<td><strong>\u0110\u01b0\u1eddng c\u1ea5p li\u1ec7u h\u1ea1 ngu\u1ed3n<\/strong><\/td>\n<td>8 kA<\/td>\n<td>Ch\u1edd 0,4 gi\u00e2y (trong I<sub>Icw<\/sub>)<\/td>\n<td>T\u00e1c \u0111\u1ed9ng t\u1ee9c th\u1eddi (&gt;12.5\u00d7 I<sub>n<\/sub>)<\/td>\n<\/tr>\n<tr>\n<td><strong>\u0110\u01b0\u1eddng c\u1ea5p li\u1ec7u h\u1ea1 ngu\u1ed3n<\/strong><\/td>\n<td>45 kA<\/td>\n<td>Ch\u1edd 0,4 gi\u00e2y (trong I<sub>Icw<\/sub>)<\/td>\n<td>T\u00e1c \u0111\u1ed9ng t\u1ee9c th\u1eddi (h\u1ea1n d\u00f2ng)<\/td>\n<\/tr>\n<tr>\n<td><strong>Thanh c\u00e1i ch\u00ednh<\/strong><\/td>\n<td>60 kA<\/td>\n<td>T\u00e1c \u0111\u1ed9ng sau 0.4s<\/td>\n<td>Kh\u00f4ng b\u1ecb \u1ea3nh h\u01b0\u1edfng<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<p><strong>Qu\u1ea3<\/strong>: T\u00ednh ch\u1ecdn l\u1ecdc ho\u00e0n to\u00e0n l\u00ean \u0111\u1ebfn 50kA (MCCB I<sub>Icu<\/sub> gi\u1edbi h\u1ea1n)<\/p>\n<h3>Chi\u1ebfn l\u01b0\u1ee3c 2: Ph\u1ed1i h\u1ee3p MCCB-to-MCCB (Gi\u1edbi h\u1ea1n)<\/h3>\n<p><strong>C\u1ea5u h\u00ecnh:<\/strong><\/p>\n<ul>\n<li><strong>Th\u01b0\u1ee3ng ngu\u1ed3n<\/strong>: MCCB 400A, t\u1ee9c th\u1eddi = 5,000A (12.5\u00d7 I<sub>n<\/sub>)<\/li>\n<li><strong>H\u1ea1 ngu\u1ed3n<\/strong>: MCCB 100A, t\u1ee9c th\u1eddi = 1,300A (13\u00d7 I<sub>n<\/sub>)<\/li>\n<\/ul>\n<p><strong>Ph\u00e2n t\u00edch ph\u1ed1i h\u1ee3p:<\/strong><\/p>\n<table style=\"border-collapse: collapse; width: 100%; margin: 20px 0;\" border=\"1\" cellpadding=\"10\">\n<thead>\n<tr style=\"background-color: #f2f2f2;\">\n<th>D\u00f2ng \u0111i\u1ec7n S\u1ef1 c\u1ed1<\/th>\n<th>MCCB ph\u00eda tr\u00ean<\/th>\n<th>MCCB ph\u00eda d\u01b0\u1edbi<\/th>\n<th>T\u00ednh ch\u1ecdn l\u1ecdc?<\/th>\n<\/tr>\n<\/thead>\n<tbody>\n<tr>\n<td><strong>1.500A<\/strong><\/td>\n<td>Tr\u1ec5 ng\u1eafn (0.3s)<\/td>\n<td>Chuy\u1ebfn \u0111i t\u1ee9c th\u00ec<\/td>\n<td>\u2705 C\u00f3<\/td>\n<\/tr>\n<tr>\n<td><strong>4,000A<\/strong><\/td>\n<td>Tr\u1ec5 ng\u1eafn (0.3s)<\/td>\n<td>Chuy\u1ebfn \u0111i t\u1ee9c th\u00ec<\/td>\n<td>\u2705 C\u00f3<\/td>\n<\/tr>\n<tr>\n<td><strong>6,000A<\/strong><\/td>\n<td><strong>Chuy\u1ebfn \u0111i t\u1ee9c th\u00ec<\/strong><\/td>\n<td>Chuy\u1ebfn \u0111i t\u1ee9c th\u00ec<\/td>\n<td>\u274c Kh\u00f4ng (c\u1ea3 hai \u0111\u1ec1u t\u00e1c \u0111\u1ed9ng)<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<p><strong>Gi\u1edbi h\u1ea1n ch\u1ecdn l\u1ecdc<\/strong>: ~4,500A (90% c\u1ee7a c\u00e0i \u0111\u1eb7t t\u1ee9c th\u1eddi ph\u00eda tr\u00ean)<\/p>\n<p><strong>C\u1ea3i ti\u1ebfn<\/strong>: S\u1eed d\u1ee5ng b\u1ea3ng ph\u1ed1i h\u1ee3p c\u1ee7a nh\u00e0 s\u1ea3n xu\u1ea5t \u0111\u1ec3 x\u00e1c minh n\u0103ng l\u01b0\u1ee3ng th\u00f4ng qua th\u1ef1c t\u1ebf\u2014MCCB h\u1ea1n d\u00f2ng v\u1eabn c\u00f3 th\u1ec3 \u0111\u1ea1t \u0111\u01b0\u1ee3c t\u00ednh ch\u1ecdn l\u1ecdc \u1edf m\u1ee9c s\u1ef1 c\u1ed1 cao h\u01a1n th\u00f4ng qua ph\u00e2n bi\u1ec7t I<sup>2<\/sup>t.<\/p>\n<hr \/>\n<h2>B\u1ea3ng so s\u00e1nh: \u0110\u1eb7c t\u00ednh th\u1eddi gian ng\u1eafn c\u1ee7a ACB so v\u1edbi MCCB<\/h2>\n<table style=\"border-collapse: collapse; width: 100%; margin: 20px 0;\" border=\"1\" cellpadding=\"10\">\n<thead>\n<tr style=\"background-color: #f2f2f2;\">\n<th>N\u0103ng<\/th>\n<th>ACB (Lo\u1ea1i B)<\/th>\n<th>MCCB (Lo\u1ea1i A)<\/th>\n<\/tr>\n<\/thead>\n<tbody>\n<tr>\n<td><strong>T\u00f4i<sub>Icw<\/sub> Tuy\u00ean b\u1ed1<\/strong><\/td>\n<td>\u2705 C\u00f3 (30-85 kA, 0.05-1.0s)<\/td>\n<td>\u274c Kh\u00f4ng (kh\u00f4ng khai b\u00e1o)<\/td>\n<\/tr>\n<tr>\n<td><strong>Kh\u1ea3 n\u0103ng ch\u1ecbu \u0111\u1ef1ng v\u1ed1n c\u00f3<\/strong><\/td>\n<td>R\u1ea5t cao (&gt;50\u00d7 I<sub>n<\/sub>)<\/td>\n<td>Gi\u1edbi h\u1ea1n (12-14\u00d7 I<sub>n<\/sub>)<\/td>\n<\/tr>\n<tr>\n<td><strong>\u00c1p su\u1ea5t l\u00f2 xo ti\u1ebfp x\u00fac<\/strong><\/td>\n<td>Cao (ng\u0103n ch\u1eb7n l\u1ef1c \u0111\u1ea9y)<\/td>\n<td>Th\u1ea5p (cho ph\u00e9p h\u1ea1n d\u00f2ng)<\/td>\n<\/tr>\n<tr>\n<td><strong>Ng\u1eaft T\u1ee9c th\u1eddi<\/strong><\/td>\n<td>C\u00f3 th\u1ec3 t\u1eaft<\/td>\n<td>Th\u01b0\u1eddng c\u1ed1 \u0111\u1ecbnh (kh\u00f4ng th\u1ec3 t\u1eaft)<\/td>\n<\/tr>\n<tr>\n<td><strong>Ph\u1ea1m vi tr\u1ec5 ng\u1eafn<\/strong><\/td>\n<td>0.05-1.0s (c\u00f3 th\u1ec3 \u0111i\u1ec1u ch\u1ec9nh)<\/td>\n<td>0.1-0.5s (ch\u1ec9 d\u01b0\u1edbi ng\u01b0\u1ee1ng t\u1ee9c th\u1eddi)<\/td>\n<\/tr>\n<tr>\n<td><strong>Ph\u01b0\u01a1ng ph\u00e1p Ph\u1ed1i h\u1ee3p<\/strong><\/td>\n<td>D\u1ef1a tr\u00ean th\u1eddi gian (tr\u1ec5 th\u1ef1c)<\/td>\n<td>D\u1ef1a tr\u00ean d\u00f2ng \u0111i\u1ec7n (gi\u1edbi h\u1ea1n + tr\u1ec5)<\/td>\n<\/tr>\n<tr>\n<td><strong>\u0110i\u1ec3n H\u00ecnh D\u1ee5ng<\/strong><\/td>\n<td>Ngu\u1ed3n c\u1ea5p ch\u00ednh (1000-6300A)<\/td>\n<td>B\u1ea3o v\u1ec7 \u0111\u01b0\u1eddng d\u00e2y (16-1600A)<\/td>\n<\/tr>\n<tr>\n<td><strong>T\u00ednh ch\u1ecdn l\u1ecdc v\u1edbi ph\u00eda d\u01b0\u1edbi<\/strong><\/td>\n<td>Ho\u00e0n to\u00e0n (l\u00ean \u0111\u1ebfn I<sub>Icw<\/sub>)<\/td>\n<td>M\u1ed9t ph\u1ea7n (l\u00ean \u0111\u1ebfn ng\u01b0\u1ee1ng t\u1ee9c th\u1eddi)<\/td>\n<\/tr>\n<tr>\n<td><strong>C\u01a1 ch\u1ebf t\u1ef1 b\u1ea3o v\u1ec7<\/strong><\/td>\n<td>Kh\u1ed1i nhi\u1ec7t + \u0111\u1ed9 b\u1ec1n c\u01a1 h\u1ecdc<\/td>\n<td>L\u1ef1c \u0111\u1ea9y ti\u1ebfp x\u00fac + h\u1ea1n ch\u1ebf h\u1ed3 quang<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<hr \/>\n<h2>T\u1ea1i sao \u0111i\u1ec1u n\u00e0y quan tr\u1ecdng \u0111\u1ed1i v\u1edbi thi\u1ebft k\u1ebf h\u1ec7 th\u1ed1ng<\/h2>\n<h3>Quan ni\u1ec7m sai l\u1ea7m 1: \u201cTr\u1ec5 ng\u1eafn MCCB = Tr\u1ec5 ng\u1eafn ACB\u201d<\/h3>\n<p><strong>Th\u1ef1c t\u1ebf<\/strong>: Tr\u1ec5 ng\u1eafn MCCB ch\u1ec9 ho\u1ea1t \u0111\u1ed9ng trong m\u1ed9t c\u1eeda s\u1ed5 d\u00f2ng \u0111i\u1ec7n h\u1eb9p (gi\u1eefa ng\u01b0\u1ee1ng th\u1eddi gian d\u00e0i v\u00e0 t\u1ee9c th\u1eddi). \u0110\u1ed1i v\u1edbi c\u00e1c s\u1ef1 c\u1ed1 v\u01b0\u1ee3t qu\u00e1 c\u00e0i \u0111\u1eb7t t\u1ee9c th\u1eddi, MCCB t\u00e1c \u0111\u1ed9ng ngay l\u1eadp t\u1ee9c\u2014kh\u00f4ng c\u00f3 tr\u1ec5 x\u1ea3y ra.<\/p>\n<p><strong>T\u00e1c \u0111\u1ed9ng thi\u1ebft k\u1ebf<\/strong>: Khi ch\u1ec9 \u0111\u1ecbnh b\u1ea3o v\u1ec7 MCCB, lu\u00f4n x\u00e1c minh:<\/p>\n<ol>\n<li>C\u00e0i \u0111\u1eb7t t\u1ee9c th\u1eddi c\u1ee7a thi\u1ebft b\u1ecb ph\u00eda d\u01b0\u1edbi<\/li>\n<li>D\u00f2ng s\u1ef1 c\u1ed1 t\u1ed1i \u0111a t\u1ea1i \u0111i\u1ec3m ph\u1ed1i h\u1ee3p<\/li>\n<li>Li\u1ec7u d\u00f2ng s\u1ef1 c\u1ed1 c\u00f3 v\u01b0\u1ee3t qu\u00e1 ng\u01b0\u1ee1ng t\u1ee9c th\u1eddi c\u1ee7a MCCB ph\u00eda tr\u00ean hay kh\u00f4ng<\/li>\n<\/ol>\n<h3>Quan ni\u1ec7m sai l\u1ea7m 2: \u201cKh\u00f4ng c\u00f3 I<sub>Icw<\/sub> \u0110\u1ecbnh m\u1ee9c = Kh\u00f4ng c\u00f3 kh\u1ea3 n\u0103ng ch\u1ecbu \u0111\u1ef1ng th\u1eddi gian ng\u1eafn\u201d<\/h3>\n<p><strong>Th\u1ef1c t\u1ebf<\/strong>: MCCB s\u1edf h\u1eefu kh\u1ea3 n\u0103ng ch\u1ecbu \u0111\u1ef1ng th\u1eddi gian ng\u1eafn v\u1ed1n c\u00f3 l\u00ean \u0111\u1ebfn ng\u01b0\u1ee1ng l\u1ef1c \u0111\u1ea9y ti\u1ebfp x\u00fac c\u1ee7a ch\u00fang (~12-14\u00d7 I<sub>n<\/sub>). Kh\u1ea3 n\u0103ng n\u00e0y cho ph\u00e9p ph\u1ed1i h\u1ee3p gi\u1edbi h\u1ea1n v\u1edbi c\u00e1c thi\u1ebft b\u1ecb ph\u00eda d\u01b0\u1edbi, m\u1eb7c d\u00f9 kh\u00f4ng \u1edf m\u1ee9c \u0111\u1ed9 c\u1ee7a ACB.<\/p>\n<p><strong>T\u00e1c \u0111\u1ed9ng thi\u1ebft k\u1ebf<\/strong>: Ph\u1ed1i h\u1ee3p MCCB-to-MCCB l\u00e0 c\u00f3 th\u1ec3 nh\u01b0ng y\u00eau c\u1ea7u:<\/p>\n<ul>\n<li>Ph\u00e2n t\u00e1ch c\u00e0i \u0111\u1eb7t t\u1ee9c th\u1eddi c\u1ea9n th\u1eadn (t\u1ef7 l\u1ec7 t\u1ed1i thi\u1ec3u 1.5:1)<\/li>\n<li>B\u1ea3ng ch\u1ecdn l\u1ecdc do nh\u00e0 s\u1ea3n xu\u1ea5t cung c\u1ea5p<\/li>\n<li>Xem x\u00e9t \u1ea3nh h\u01b0\u1edfng c\u1ee7a vi\u1ec7c h\u1ea1n ch\u1ebf d\u00f2ng \u0111i\u1ec7n \u0111\u1ebfn n\u0103ng l\u01b0\u1ee3ng th\u00f4ng qua<\/li>\n<\/ul>\n<h3>Quan ni\u1ec7m sai l\u1ea7m 3: \u201cV\u00f4 hi\u1ec7u h\u00f3a Chuy\u1ebfn \u0111i T\u1ee9c th\u1eddi L\u00e0m cho MCCB = ACB\u201d<\/h3>\n<p><strong>Th\u1ef1c t\u1ebf<\/strong>: Ngay c\u1ea3 MCCB c\u00f3 th\u1ec3 v\u00f4 hi\u1ec7u h\u00f3a chuy\u1ebfn \u0111i t\u1ee9c th\u1eddi (v\u00ed d\u1ee5: NSX) k\u1ebft h\u1ee3p c\u00e1c c\u01a1 ch\u1ebf ghi \u0111\u00e8 d\u1ef1a tr\u00ean n\u0103ng l\u01b0\u1ee3ng, bu\u1ed9c chuy\u1ebfn \u0111i \u1edf m\u1ee9c l\u1ed7i c\u1ef1c cao (&gt;25\u00d7 I<sub>n<\/sub>). Ch\u00fang kh\u00f4ng th\u1ec3 \u201cch\u1edd h\u1ebft\u201d d\u00f2ng \u0111i\u1ec7n l\u1ed7i cao nh\u01b0 ACB.<\/p>\n<p><strong>T\u00e1c \u0111\u1ed9ng thi\u1ebft k\u1ebf<\/strong>: Khi s\u1eed d\u1ee5ng MCCB c\u00f3 th\u1ec3 \u0111i\u1ec1u ch\u1ec9nh t\u1ee9c th\u1eddi:<\/p>\n<ul>\n<li>X\u00e1c minh ng\u01b0\u1ee1ng chuy\u1ebfn \u0111i n\u0103ng l\u01b0\u1ee3ng v\u1edbi nh\u00e0 s\u1ea3n xu\u1ea5t<\/li>\n<li>Kh\u00f4ng cho r\u1eb1ng h\u00e0nh vi gi\u1ed1ng ACB \u1edf d\u00f2ng \u0111i\u1ec7n l\u1ed7i g\u1ea7n I<sub>Icu<\/sub><\/li>\n<li>Xem x\u00e9t \u00fd ngh\u0129a n\u0103ng l\u01b0\u1ee3ng h\u1ed3 quang c\u1ee7a vi\u1ec7c v\u1ea5p ch\u1eadm tr\u1ec5<\/li>\n<\/ul>\n<hr \/>\n<h2>Li\u00ean k\u1ebft n\u1ed9i b\u1ed9 &amp; T\u00e0i nguy\u00ean li\u00ean quan<\/h2>\n<p>\u0110\u1ec3 hi\u1ec3u s\u00e2u h\u01a1n v\u1ec1 c\u00e1c kh\u00e1i ni\u1ec7m b\u1ea3o v\u1ec7 li\u00ean quan, h\u00e3y kh\u00e1m ph\u00e1 c\u00e1c h\u01b0\u1edbng d\u1eabn k\u1ef9 thu\u1eadt VIOX n\u00e0y:<\/p>\n<ul>\n<li><a href=\"https:\/\/test.viox.com\/vi\/electrical-derating-temperature-altitude-grouping-factors\/\"><strong>Gi\u1ea3m \u0111\u1ecbnh m\u1ee9c \u0111i\u1ec7n: Nhi\u1ec7t \u0111\u1ed9, \u0110\u1ed9 cao &amp; C\u00e1c y\u1ebfu t\u1ed1 nh\u00f3m<\/strong><\/a> \u2013 T\u00ecm hi\u1ec3u c\u00e1ch c\u00e1c y\u1ebfu t\u1ed1 m\u00f4i tr\u01b0\u1eddng \u1ea3nh h\u01b0\u1edfng \u0111\u1ebfn x\u1ebfp h\u1ea1ng d\u00f2ng \u0111i\u1ec7n v\u00e0 ph\u1ed1i h\u1ee3p c\u1ee7a b\u1ed9 ng\u1eaft m\u1ea1ch<\/li>\n<li><a href=\"https:\/\/test.viox.com\/vi\/ats-circuit-breaker-coordination-guide-icw-selectivity\/\"><strong>H\u01b0\u1edbng d\u1eabn ph\u1ed1i h\u1ee3p ATS &amp; B\u1ed9 ng\u1eaft m\u1ea1ch: I<sub>Icw<\/sub> &amp; Gi\u1ea3i th\u00edch t\u00ednh ch\u1ecdn l\u1ecdc<\/strong><\/a> \u2013 Ph\u00e2n t\u00edch chi ti\u1ebft v\u1ec1 ph\u1ed1i h\u1ee3p Lo\u1ea1i A so v\u1edbi Lo\u1ea1i B trong c\u00e1c \u1ee9ng d\u1ee5ng chuy\u1ec3n \u0111\u1ed5i t\u1ef1 \u0111\u1ed9ng<\/li>\n<li><a href=\"https:\/\/test.viox.com\/vi\/current-limiting-circuit-breaker-guide\/\"><strong>H\u1ea1n Ch\u1ebf Hi\u1ec7n Ng\u1eaft M\u1ea1ch D\u1eabn: V\u00e0 B\u1ea3o V\u1ec7 K\u1ef9 Thu\u1eadt<\/strong><\/a> \u2013 \u0110i s\u00e2u v\u00e0o v\u1eadt l\u00fd \u0111\u1ea9y \u0111i\u1ec7n t\u1eeb v\u00e0 I<sup>2<\/sup>gi\u1edbi h\u1ea1n t<\/li>\n<li><a href=\"https:\/\/test.viox.com\/vi\/types-of-circuit-breakers\/\"><strong>C\u00e1c lo\u1ea1i c\u1ea7u dao: H\u01b0\u1edbng d\u1eabn ph\u00e2n lo\u1ea1i \u0111\u1ea7y \u0111\u1ee7<\/strong><\/a> \u2013 T\u1ed5ng quan to\u00e0n di\u1ec7n v\u1ec1 s\u1ef1 kh\u00e1c bi\u1ec7t v\u00e0 \u1ee9ng d\u1ee5ng c\u1ee7a ACB, MCCB, MCB<\/li>\n<li><a href=\"https:\/\/test.viox.com\/vi\/commercial-ev-charging-protection-guide-acb-mccb-rcbo\/\"><strong>H\u01b0\u1edbng d\u1eabn b\u1ea3o v\u1ec7 s\u1ea1c EV th\u01b0\u01a1ng m\u1ea1i: ACB, MCCB &amp; RCBO Lo\u1ea1i B<\/strong><\/a> \u2013 V\u00ed d\u1ee5 ph\u1ed1i h\u1ee3p th\u1ef1c t\u1ebf v\u1edbi t\u00ednh to\u00e1n t\u1ea3i<\/li>\n<\/ul>\n<hr \/>\n<h2>C\u00e2u h\u1ecfi th\u01b0\u1eddng g\u1eb7p: B\u1ea3o v\u1ec7 th\u1eddi gian ng\u1eafn MCCB<\/h2>\n<h3>Q1: T\u00f4i c\u00f3 th\u1ec3 s\u1eed d\u1ee5ng MCCB l\u00e0m ngu\u1ed3n c\u1ea5p ch\u00ednh thay v\u00ec ACB kh\u00f4ng?<\/h3>\n<p><strong>M\u1ed9t<\/strong>: C\u00f3 th\u1ec3 nh\u01b0ng kh\u00f4ng \u0111\u01b0\u1ee3c khuy\u1ebfn ngh\u1ecb cho c\u00e1c h\u1ec7 th\u1ed1ng y\u00eau c\u1ea7u t\u00ednh ch\u1ecdn l\u1ecdc \u0111\u1ea7y \u0111\u1ee7. MCCB thi\u1ebfu I \u0111\u01b0\u1ee3c khai b\u00e1o<sub>Icw<\/sub> x\u1ebfp h\u1ea1ng, v\u00ec v\u1eady ch\u00fang kh\u00f4ng th\u1ec3 tr\u00ec ho\u00e3n chuy\u1ebfn \u0111i m\u1ed9t c\u00e1ch \u0111\u00e1ng tin c\u1eady \u0111\u1ec3 ph\u1ed1i h\u1ee3p h\u1ea1 l\u01b0u \u1edf d\u00f2ng \u0111i\u1ec7n l\u1ed7i cao (&gt;10\u00d7 I<sub>n<\/sub>). S\u1eed d\u1ee5ng ACB cho ngu\u1ed3n c\u1ea5p ch\u00ednh trong c\u00e1c c\u01a1 s\u1edf c\u00f4ng nghi\u1ec7p n\u01a1i t\u00ednh ch\u1ecdn l\u1ecdc l\u00e0 r\u1ea5t quan tr\u1ecdng ho\u1eb7c x\u00e1c minh gi\u1edbi h\u1ea1n ph\u1ed1i h\u1ee3p v\u1edbi b\u1ea3ng c\u1ee7a nh\u00e0 s\u1ea3n xu\u1ea5t cho c\u00e1c \u1ee9ng d\u1ee5ng th\u01b0\u01a1ng m\u1ea1i.<\/p>\n<h3>Q2: \u0110i\u1ec1u g\u00ec x\u1ea3y ra n\u1ebfu t\u00f4i \u0111\u1eb7t \u0111\u1ed9 tr\u1ec5 th\u1eddi gian ng\u1eafn MCCB th\u00e0nh 0,5 gi\u00e2y nh\u01b0ng d\u00f2ng \u0111i\u1ec7n l\u1ed7i l\u00e0 20\u00d7 I<sub>n<\/sub>?<\/h3>\n<p><strong>M\u1ed9t<\/strong>: B\u1ed9 ng\u1eaft m\u1ea1ch s\u1ebd v\u1ea5p <strong>ngay l\u1eadp t\u1ee9c<\/strong> th\u00f4ng qua chuy\u1ebfn \u0111i t\u1eeb t\u00ednh, b\u1ecf qua c\u00e0i \u0111\u1eb7t tr\u1ec5 0,5 gi\u00e2y. \u0110\u1ed9 tr\u1ec5 th\u1eddi gian ng\u1eafn MCCB ch\u1ec9 ho\u1ea1t \u0111\u1ed9ng khi d\u00f2ng \u0111i\u1ec7n l\u1ed7i n\u1eb1m trong kho\u1ea3ng th\u1eddi gian ng\u1eafn (v\u00ed d\u1ee5: 2-10\u00d7 I<sub>n<\/sub>) v\u00e0 ng\u01b0\u1ee1ng t\u1ee9c th\u1eddi (v\u00ed d\u1ee5: 12\u00d7 I<sub>n<\/sub>). Tr\u00ean t\u1ee9c th\u1eddi, ph\u1ea7n t\u1eed t\u1eeb t\u00ednh s\u1ebd ghi \u0111\u00e8 c\u00e1c c\u00e0i \u0111\u1eb7t \u0111i\u1ec7n t\u1eed.<\/p>\n<h3>Q3: T\u1ea5t c\u1ea3 MCCB c\u00f3 s\u1eed d\u1ee5ng c\u00f4ng ngh\u1ec7 gi\u1edbi h\u1ea1n d\u00f2ng \u0111i\u1ec7n kh\u00f4ng?<\/h3>\n<p><strong>M\u1ed9t<\/strong>: Kh\u00f4ng. MCCB nhi\u1ec7t t\u1eeb (chuy\u1ebfn \u0111i c\u1ed1 \u0111\u1ecbnh, kh\u00f4ng th\u1ec3 \u0111i\u1ec1u ch\u1ec9nh) th\u01b0\u1eddng s\u1eed d\u1ee5ng c\u00e1c ph\u1ea7n t\u1eed qu\u00e1 t\u1ea3i l\u01b0\u1ee1ng kim ch\u1eadm h\u01a1n v\u00e0 c\u00f3 th\u1ec3 kh\u00f4ng \u0111\u1ea1t \u0111\u01b0\u1ee3c gi\u1edbi h\u1ea1n d\u00f2ng \u0111i\u1ec7n th\u1ef1c s\u1ef1. MCCB chuy\u1ebfn \u0111i \u0111i\u1ec7n t\u1eed v\u1edbi c\u00e1c ti\u1ebfp \u0111i\u1ec3m t\u00e1c \u0111\u1ed9ng nhanh v\u00e0 m\u00e1ng h\u1ed3 quang \u0111\u01b0\u1ee3c t\u1ed1i \u01b0u h\u00f3a c\u00f3 nhi\u1ec1u kh\u1ea3 n\u0103ng gi\u1edbi h\u1ea1n d\u00f2ng \u0111i\u1ec7n h\u01a1n (x\u00e1c minh b\u1eb1ng \u0111\u01b0\u1eddng cong th\u00f4ng qua c\u1ee7a nh\u00e0 s\u1ea3n xu\u1ea5t hi\u1ec3n th\u1ecb I<sub>p<\/sub> v\u00e0 I<sup>2<\/sup>gi\u00e1 tr\u1ecb t d\u01b0\u1edbi m\u1ee9c l\u1ed7i ti\u1ec1m n\u0103ng).<\/p>\n<h3>Q4: L\u00e0m c\u00e1ch n\u00e0o \u0111\u1ec3 x\u00e1c minh t\u00ednh ch\u1ecdn l\u1ecdc gi\u1eefa hai MCCB?<\/h3>\n<p><strong>M\u1ed9t<\/strong>: S\u1eed d\u1ee5ng b\u1ea3ng ph\u1ed1i h\u1ee3p c\u1ee7a nh\u00e0 s\u1ea3n xu\u1ea5t (kh\u00f4ng ch\u1ec9 \u0111\u01b0\u1eddng cong th\u1eddi gian-d\u00f2ng \u0111i\u1ec7n). B\u1ea3ng t\u00ednh cho:<\/p>\n<ul>\n<li>N\u0103ng l\u01b0\u1ee3ng th\u00f4ng qua (I<sup>2<\/sup>t) c\u1ee7a b\u1ed9 ng\u1eaft m\u1ea1ch h\u1ea1 l\u01b0u<\/li>\n<li>Ng\u01b0\u1ee1ng n\u0103ng l\u01b0\u1ee3ng kh\u00f4ng v\u1ea5p c\u1ee7a b\u1ed9 ng\u1eaft m\u1ea1ch th\u01b0\u1ee3ng ngu\u1ed3n<\/li>\n<li>\u1ea2nh h\u01b0\u1edfng gi\u1edbi h\u1ea1n d\u00f2ng \u0111i\u1ec7n \u1edf c\u00e1c m\u1ee9c l\u1ed7i kh\u00e1c nhau<br \/>\nV\u00ed d\u1ee5: Schneider Electric cung c\u1ea5p c\u00e1c b\u1ea3ng ch\u1ecdn l\u1ecdc chi ti\u1ebft trong h\u01b0\u1edbng d\u1eabn ph\u1ed1i h\u1ee3p c\u1ee7a h\u1ecd, hi\u1ec3n th\u1ecb gi\u1edbi h\u1ea1n ch\u1ecdn l\u1ecdc t\u1ed1i \u0111a (v\u00ed d\u1ee5: \u201cCh\u1ecdn l\u1ecdc l\u00ean \u0111\u1ebfn 15kA\u201d gi\u1eefa c\u00e1c ki\u1ec3u MCCB c\u1ee5 th\u1ec3).<\/li>\n<\/ul>\n<h3>Q5: T\u1ea1i sao MCCB \u0111\u1ecbnh m\u1ee9c \u0111\u1ed9ng c\u01a1 c\u00f3 c\u00e0i \u0111\u1eb7t t\u1ee9c th\u1eddi cao h\u01a1n (13-14\u00d7 I<sub>n<\/sub>)?<\/h3>\n<p><strong>M\u1ed9t<\/strong>: \u0110\u1ec3 ng\u0103n ch\u1eb7n chuy\u1ebfn \u0111i phi\u1ec1n to\u00e1i trong qu\u00e1 tr\u00ecnh kh\u1edfi \u0111\u1ed9ng \u0111\u1ed9ng c\u01a1 tr\u1ef1c ti\u1ebfp (DOL). Nghi\u00ean c\u1ee9u cho th\u1ea5y d\u00f2ng \u0111i\u1ec7n kh\u1edfi \u0111\u1ed9ng \u0111\u1ed9ng c\u01a1 c\u00f3 th\u1ec3 \u0111\u1ea1t 12-13\u00d7 I<sub>n<\/sub> cho \u0111\u1ec9nh \u0111\u1ea7u ti\u00ean. MCCB \u0111\u1ecbnh m\u1ee9c \u0111\u1ed9ng c\u01a1 c\u0169ng c\u00f3 ng\u01b0\u1ee1ng \u0111\u1ea9y ti\u1ebfp x\u00fac cao h\u01a1n (&gt;14\u00d7 I<sub>n<\/sub>) \u0111\u1ec3 \u0111\u1ea3m b\u1ea3o c\u00e1c ti\u1ebfp \u0111i\u1ec3m kh\u00f4ng b\u1ecb th\u1ed5i tung trong qu\u00e1 tr\u00ecnh chuy\u1ec3n ti\u1ebfp kh\u1edfi \u0111\u1ed9ng, \u0111i\u1ec1u n\u00e0y s\u1ebd g\u00e2y ra hao m\u00f2n kh\u00f4ng c\u1ea7n thi\u1ebft v\u00e0 kh\u1ea3 n\u0103ng h\u00e0n khi \u0111\u00f3ng l\u1ea1i.<\/p>\n<hr \/>\n<h2>K\u1ebft lu\u1eadn<\/h2>\n<p>Ngh\u1ecbch l\u00fd r\u00f5 r\u00e0ng c\u1ee7a MCCB cung c\u1ea5p b\u1ea3o v\u1ec7 tr\u1ec5 th\u1eddi gian ng\u1eafn m\u00e0 kh\u00f4ng c\u00f3 I \u0111\u01b0\u1ee3c \u0111\u00e1nh gi\u00e1<sub>Icw<\/sub> gi\u00e1 tr\u1ecb b\u1eaft ngu\u1ed3n t\u1eeb s\u1ef1 kh\u00e1c bi\u1ec7t c\u01a1 b\u1ea3n trong tri\u1ebft l\u00fd b\u1ea3o v\u1ec7: <strong>ACB ch\u1ecbu \u0111\u01b0\u1ee3c c\u00e1c l\u1ed7i th\u00f4ng qua \u0111\u1ed9 b\u1ec1n c\u01a1 h\u1ecdc v\u00e0 kh\u1ed1i l\u01b0\u1ee3ng nhi\u1ec7t, trong khi MCCB gi\u1edbi h\u1ea1n c\u00e1c l\u1ed7i th\u00f4ng qua v\u1eadt l\u00fd \u0111i\u1ec7n t\u1eeb v\u00e0 ng\u1eaft h\u1ed3 quang nhanh ch\u00f3ng.<\/strong><\/p>\n<p>Hi\u1ec3u \u0111\u01b0\u1ee3c s\u1ef1 kh\u00e1c bi\u1ec7t n\u00e0y l\u00e0 r\u1ea5t quan tr\u1ecdng \u0111\u1ed1i v\u1edbi c\u00e1c k\u1ef9 s\u01b0 \u0111i\u1ec7n thi\u1ebft k\u1ebf c\u00e1c s\u01a1 \u0111\u1ed3 ph\u1ed1i h\u1ee3p. MCCB c\u00f3 th\u1ec3 \u0111\u1ea1t \u0111\u01b0\u1ee3c s\u1ef1 ph\u1ed1i h\u1ee3p ch\u1ecdn l\u1ecdc v\u1edbi c\u00e1c thi\u1ebft b\u1ecb h\u1ea1 l\u01b0u trong kh\u1ea3 n\u0103ng ch\u1ecbu \u0111\u1ef1ng th\u1eddi gian ng\u1eafn v\u1ed1n c\u00f3 c\u1ee7a ch\u00fang (th\u01b0\u1eddng l\u00e0 12-14\u00d7 I<sub>n<\/sub>), nh\u01b0ng ch\u00fang kh\u00f4ng th\u1ec3 sao ch\u00e9p h\u00e0nh vi ACB \u1edf d\u00f2ng \u0111i\u1ec7n l\u1ed7i cao g\u1ea7n v\u1edbi kh\u1ea3 n\u0103ng ph\u00e1 v\u1ee1 c\u1ee7a ch\u00fang. \u0110\u1ed1i v\u1edbi c\u00e1c \u1ee9ng d\u1ee5ng y\u00eau c\u1ea7u t\u00ednh ch\u1ecdn l\u1ecdc \u0111\u1ea7y \u0111\u1ee7 tr\u00ean to\u00e0n b\u1ed9 ph\u1ea1m vi d\u00f2ng \u0111i\u1ec7n l\u1ed7i, ngu\u1ed3n c\u1ea5p ch\u00ednh ACB ph\u1ed1i h\u1ee3p v\u1edbi b\u1ed9 n\u1ea1p MCCB v\u1eabn l\u00e0 ti\u00eau chu\u1ea9n v\u00e0ng\u2014t\u1eadn d\u1ee5ng kh\u1ea3 n\u0103ng tr\u1ec5 th\u1eddi gian Lo\u1ea1i B \u1edf th\u01b0\u1ee3ng ngu\u1ed3n trong khi khai th\u00e1c l\u1ee3i \u00edch gi\u1edbi h\u1ea1n d\u00f2ng \u0111i\u1ec7n Lo\u1ea1i A \u1edf h\u1ea1 ngu\u1ed3n.<\/p>\n<p><strong>Nguy\u00ean t\u1eafc thi\u1ebft k\u1ebf ch\u00ednh<\/strong>: Gh\u00e9p danh m\u1ee5c b\u1ed9 ng\u1eaft m\u1ea1ch v\u1edbi \u1ee9ng d\u1ee5ng\u2014s\u1eed d\u1ee5ng ACB khi b\u1ea1n c\u1ea7n \u201cch\u1edd h\u1ebft\u201d c\u00e1c l\u1ed7i, s\u1eed d\u1ee5ng MCCB khi b\u1ea1n c\u1ea7n \u201cgi\u1ebft c\u00e1c l\u1ed7i nhanh ch\u00f3ng\u201d.\u201d<\/p>\n<hr \/>\n<p><strong>Gi\u1edbi thi\u1ec7u v\u1ec1 VIOX Electric<\/strong>: VIOX Electric l\u00e0 nh\u00e0 s\u1ea3n xu\u1ea5t B2B h\u00e0ng \u0111\u1ea7u v\u1ec1 thi\u1ebft b\u1ecb \u0111i\u1ec7n, chuy\u00ean v\u1ec1 b\u1ed9 ng\u1eaft m\u1ea1ch v\u1ecf \u0111\u00fac (MCCB), b\u1ed9 ng\u1eaft m\u1ea1ch kh\u00f4ng kh\u00ed (ACB) v\u00e0 c\u00e1c gi\u1ea3i ph\u00e1p b\u1ea3o v\u1ec7 to\u00e0n di\u1ec7n cho c\u00e1c \u1ee9ng d\u1ee5ng c\u00f4ng nghi\u1ec7p v\u00e0 th\u01b0\u01a1ng m\u1ea1i. \u0110\u1ed9i ng\u0169 k\u1ef9 thu\u1eadt c\u1ee7a ch\u00fang t\u00f4i cung c\u1ea5p h\u1ed7 tr\u1ee3 k\u1ef9 thu\u1eadt cho c\u00e1c nghi\u00ean c\u1ee9u ph\u1ed1i h\u1ee3p ph\u1ee9c t\u1ea1p v\u00e0 t\u1ed1i \u01b0u h\u00f3a thi\u1ebft k\u1ebf h\u1ec7 th\u1ed1ng. <a href=\"https:\/\/test.viox.com\/vi\/\">Li\u00ean h\u1ec7 v\u1edbi ch\u00fang t\u00f4i<\/a> \u0111\u1ec3 \u0111\u01b0\u1ee3c h\u01b0\u1edbng d\u1eabn c\u1ee5 th\u1ec3 cho \u1ee9ng d\u1ee5ng.<\/p>\n<\/div>","protected":false},"excerpt":{"rendered":"<p>MCCB electronic trip unit in industrial panel showing 400A rating and current display &#8211; VIOX Electric Direct Answer Molded Case Circuit Breakers (MCCBs) can provide short-time delay protection without a rated short-time withstand current (Icw) because they belong to IEC 60947-2 Category A, where selectivity is achieved through current-limiting technology rather than intentional time delays. [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":21475,"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-21474","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\/21474","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=21474"}],"version-history":[{"count":1,"href":"https:\/\/test.viox.com\/vi\/wp-json\/wp\/v2\/posts\/21474\/revisions"}],"predecessor-version":[{"id":21476,"href":"https:\/\/test.viox.com\/vi\/wp-json\/wp\/v2\/posts\/21474\/revisions\/21476"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/test.viox.com\/vi\/wp-json\/wp\/v2\/media\/21475"}],"wp:attachment":[{"href":"https:\/\/test.viox.com\/vi\/wp-json\/wp\/v2\/media?parent=21474"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/test.viox.com\/vi\/wp-json\/wp\/v2\/categories?post=21474"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/test.viox.com\/vi\/wp-json\/wp\/v2\/tags?post=21474"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}