{"id":3571,"date":"2026-08-08T15:23:36","date_gmt":"2026-08-08T15:23:36","guid":{"rendered":"https:\/\/huyuglobal.com\/?p=3571"},"modified":"2026-08-08T15:23:38","modified_gmt":"2026-08-08T15:23:38","slug":"which-type-of-circuit-breaker-is-designed-to-be-reconditioned","status":"publish","type":"post","link":"https:\/\/huyuglobal.com\/vi\/blog\/which-type-of-circuit-breaker-is-designed-to-be-reconditioned\/","title":{"rendered":"Lo\u1ea1i B\u1ed9 Ng\u1eaft M\u1ea1ch N\u00e0o \u0110\u01b0\u1ee3c Thi\u1ebft K\u1ebf \u0110\u1ec3 \u0110\u01b0\u1ee3c T\u00e2n Trang?"},"content":{"rendered":"<p>Trong tr\u01b0\u1eddng h\u1ee3p c\u01a1 s\u1edf c\u1ee7a b\u1ea1n s\u1eed d\u1ee5ng c\u00e1c thi\u1ebft b\u1ecb \u0111\u00f3ng c\u1eaft l\u1ed7i th\u1eddi, b\u1ea1n c\u00f3 th\u1ec3 th\u1eafc m\u1eafc li\u1ec7u c\u00f3 th\u1ec3 t\u00e2n trang l\u1ea1i c\u00e1c b\u1ed9 ng\u1eaft m\u1ea1ch hay n\u00ean mua thi\u1ebft b\u1ecb m\u1edbi ho\u00e0n to\u00e0n. C\u00e2u tr\u1ea3 l\u1eddi kh\u00f4ng \u0111\u01a1n gi\u1ea3n, v\u00ec n\u00f3 ph\u1ee5 thu\u1ed9c v\u00e0o lo\u1ea1i b\u1ed9 ng\u1eaft m\u1ea1ch trong c\u01a1 s\u1edf c\u1ee7a b\u1ea1n. Theo Quy chu\u1ea9n \u0110i\u1ec7n Qu\u1ed1c gia (NEC) n\u0103m 2020, c\u00e1c b\u1ed9 ng\u1eaft m\u1ea1ch \u0111i\u1ec7n \u00e1p th\u1ea5p, b\u1ed9 ng\u1eaft m\u1ea1ch \u0111i\u1ec7n \u00e1p trung b\u00ecnh v\u00e0 b\u1ed9 ng\u1eaft m\u1ea1ch \u0111i\u1ec7n \u00e1p cao \u0111\u01b0\u1ee3c ph\u00e9p ph\u1ee5c h\u1ed3i trong khi c\u00e1c b\u1ed9 ng\u1eaft m\u1ea1ch v\u1ecf \u0111\u00fac (MCCB), b\u1ed9 ng\u1eaft m\u1ea1ch GFCI v\u00e0 b\u1ed9 ng\u1eaft m\u1ea1ch AFCI kh\u00f4ng n\u00ean \u0111\u01b0\u1ee3c l\u00e0m m\u1edbi theo \u0110i\u1ec1u 210.15 v\u00e0 M\u1ee5c 240.88 c\u1ee7a NEC. Do \u0111\u00f3, s\u1ef1 ph\u00e2n bi\u1ec7t n\u00e0y r\u1ea5t quan tr\u1ecdng \u0111\u1ed1i v\u1edbi c\u00e1c qu\u1ea3n l\u00fd nh\u00e0 m\u00e1y, nh\u00e0 th\u1ea7u \u0111i\u1ec7n v\u00e0 k\u1ef9 s\u01b0 b\u1ea3o tr\u00ec c\u1ea7n c\u00e2n b\u1eb1ng chi ph\u00ed v\u1edbi an to\u00e0n v\u00e0 tu\u00e2n th\u1ee7 quy chu\u1ea9n.<\/p>\n<blockquote><p><strong>Tr\u1ea3 l\u1eddi nhanh:<\/strong> C\u00e1c b\u1ed9 ng\u1eaft m\u1ea1ch c\u00f3 th\u1ec3 \u0111\u01b0\u1ee3c t\u00e2n trang bao g\u1ed3m b\u1ed9 ng\u1eaft m\u1ea1ch \u0111i\u1ec7n \u00e1p th\u1ea5p, b\u1ed9 ng\u1eaft m\u1ea1ch \u0111i\u1ec7n \u00e1p trung b\u00ecnh v\u00e0 b\u1ed9 ng\u1eaft m\u1ea1ch \u0111i\u1ec7n \u00e1p cao. B\u1ed9 ng\u1eaft m\u1ea1ch v\u1ecf \u0111\u00fac kh\u00f4ng th\u1ec3 \u0111\u01b0\u1ee3c t\u00e2n trang nh\u01b0 quy \u0111\u1ecbnh t\u1ea1i NEC 240.88(A)(1), v\u00e0 b\u1ea5t k\u1ef3 b\u1ed9 ng\u1eaft m\u1ea1ch n\u00e0o cung c\u1ea5p b\u1ea3o v\u1ec7 GFCI, b\u1ea3o v\u1ec7 AFCI ho\u1eb7c GFPE \u0111\u1ec1u b\u1ecb c\u1ea5m theo NEC 210.15. C\u00e1c nh\u00e0 s\u1ea3n xu\u1ea5t \u0111\u00e1ng ch\u00fa \u00fd cung c\u1ea5p d\u1ecbch v\u1ee5 t\u00e2n trang t\u1ea1i nh\u00e0 m\u00e1y bao g\u1ed3m: Eaton, ABB v\u00e0 Schneider Electric \/ Square D. Qu\u00e1 tr\u00ecnh t\u00e2n trang tu\u00e2n th\u1ee7 c\u00e1c quy \u0111\u1ecbnh c\u1ee7a IEEE C37.59 v\u00e0 NEMA AB 4. Th\u00f4ng th\u01b0\u1eddng, chi ph\u00ed t\u00e2n trang b\u1eb1ng 40-60% chi ph\u00ed c\u1ee7a b\u1ed9 ng\u1eaft m\u1ea1ch m\u1edbi v\u00e0 k\u00e9o d\u00e0i th\u00eam 10-20 n\u0103m tu\u1ed5i th\u1ecd s\u1eed d\u1ee5ng.<\/p><\/blockquote>\n<h2>C\u00e1c lo\u1ea1i b\u1ed9 ng\u1eaft m\u1ea1ch \u0111\u01b0\u1ee3c ph\u00e9p t\u00e1i ch\u1ebf<\/h2>\n<p>Theo M\u1ee5c 240.88(A) c\u1ee7a NEC 2020, c\u00e1c <strong>lo\u1ea1i b\u1ed9 ng\u1eaft m\u1ea1ch<\/strong> sau \u0111\u00e2y \u0111\u01b0\u1ee3c ph\u00e9p t\u00e1i ch\u1ebf r\u00f5 r\u00e0ng:<\/p>\n<p style=\"text-align: center;\"><img loading=\"lazy\" decoding=\"async\" class=\"alignnone size-full wp-image-3573\" src=\"https:\/\/huyuglobal.com\/wp-content\/uploads\/2026\/08\/Circuit-Breaker-Types-Permitted-for-Reconditioning.webp\" alt=\"C\u00e1c lo\u1ea1i b\u1ed9 ng\u1eaft m\u1ea1ch \u0111\u01b0\u1ee3c ph\u00e9p t\u00e1i ch\u1ebf\" width=\"1448\" height=\"1086\" \/><\/p>\n<table>\n<thead>\n<tr>\n<th>Lo\u1ea1i C\u1ea7u Dao<\/th>\n<th>Tham chi\u1ebfu NEC<\/th>\n<th>\u1ee8ng d\u1ee5ng \u0111i\u1ec3n h\u00ecnh<\/th>\n<th>D\u1ea3i \u0110i\u1ec7n \u00c1p<\/th>\n<\/tr>\n<\/thead>\n<tbody>\n<tr>\n<td><strong>B\u1ed9 ng\u1eaft m\u1ea1ch \u0111i\u1ec7n \u00e1p th\u1ea5p<\/strong><\/td>\n<td>88(A)(2)<\/td>\n<td>B\u1ed9 ng\u1eaft m\u1ea1ch r\u00fat ra trong thi\u1ebft b\u1ecb \u0111\u00f3ng c\u1eaft, b\u1ed9 ng\u1eaft m\u1ea1ch d\u1ecbch v\u1ee5 ch\u00ednh<\/td>\n<td>L\u00ean \u0111\u1ebfn 1.000V AC<\/td>\n<\/tr>\n<tr>\n<td><strong>B\u1ed9 ng\u1eaft m\u1ea1ch \u0111i\u1ec7n \u00e1p trung b\u00ecnh<\/strong><\/td>\n<td>88(A)(3)<\/td>\n<td>Tr\u1ea1m bi\u1ebfn \u00e1p c\u00f4ng nghi\u1ec7p, ph\u00e2n ph\u1ed1i c\u01a1 s\u1edf l\u1edbn<\/td>\n<td>000V \u2013 38kV<\/td>\n<\/tr>\n<tr>\n<td><strong>B\u1ed9 ng\u1eaft m\u1ea1ch \u0111i\u1ec7n \u00e1p cao<\/strong><\/td>\n<td>88(A)(3)<\/td>\n<td>Tr\u1ea1m bi\u1ebfn \u00e1p quy m\u00f4 ti\u1ec7n \u00edch, truy\u1ec1n t\u1ea3i<\/td>\n<td>Tr\u00ean 38kV<\/td>\n<\/tr>\n<tr>\n<td><strong>B\u1ea3ng \u0111i\u1ec1u khi\u1ec3n v\u00e0 c\u00e1c ph\u1ea7n thi\u1ebft b\u1ecb \u0111\u00f3ng c\u1eaft<\/strong><\/td>\n<td>8(B), 490.49<\/td>\n<td>Hi\u1ec7n \u0111\u1ea1i h\u00f3a to\u00e0n b\u1ed9 d\u00f2ng thi\u1ebft b\u1ecb \u0111\u00f3ng c\u1eaft<\/td>\n<td>Nhi\u1ec1u lo\u1ea1i<\/td>\n<\/tr>\n<tr>\n<td><strong>R\u01a1 le b\u1ea3o v\u1ec7 \u0111i\u1ec7n c\u01a1 &amp; CT<\/strong><\/td>\n<td>88(B)(2)<\/td>\n<td>H\u1ec7 th\u1ed1ng b\u1ea3o v\u1ec7 trong tr\u1ea1m bi\u1ebfn \u00e1p<\/td>\n<td>Nhi\u1ec1u lo\u1ea1i<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<p>\u0110\u1eb7c \u0111i\u1ec3m ch\u00ednh chung c\u1ee7a t\u1ea5t c\u1ea3 c\u00e1c <strong>b\u1ed9 ng\u1eaft m\u1ea1ch c\u00f3 th\u1ec3 t\u00e1i ch\u1ebf<\/strong> l\u00e0 ch\u00fang <strong>thu\u1ed9c lo\u1ea1i r\u00fat ra ho\u1eb7c c\u00f3 th\u1ec3 th\u00e1o r\u1eddi<\/strong> \u0111\u01b0\u1ee3c thi\u1ebft k\u1ebf cho vi\u1ec7c b\u1ea3o tr\u00ec \u2014 kh\u00f4ng ph\u1ea3i l\u00e0 c\u00e1c \u0111\u01a1n v\u1ecb k\u00edn. B\u1ed9 ng\u1eaft m\u1ea1ch \u0111i\u1ec7n \u00e1p th\u1ea5p, nh\u01b0 nh\u1eefng b\u1ed9 \u0111\u01b0\u1ee3c s\u1eed d\u1ee5ng trong <a href=\"https:\/\/huyuglobal.com\/vi\/product\/huw9-690v-6300a-air-circuit-breaker\/\">b\u1ed9 ng\u1eaft m\u1ea1ch kh\u00f4ng kh\u00ed c\u00f3 \u0111\u1ecbnh m\u1ee9c l\u00ean \u0111\u1ebfn 6300A<\/a>, \u0111\u01b0\u1ee3c thi\u1ebft k\u1ebf \u0111\u1eb7c bi\u1ec7t v\u1edbi c\u01a1 ch\u1ebf c\u00f3 th\u1ec3 b\u1ea3o tr\u00ec t\u1ea1i hi\u1ec7n tr\u01b0\u1eddng, ti\u1ebfp \u0111i\u1ec3m c\u00f3 th\u1ec3 thay th\u1ebf v\u00e0 b\u1ed9 ph\u1eadn trip d\u1ec5 ti\u1ebfp c\u1eadn. \u0110i\u1ec1u n\u00e0y ho\u00e0n to\u00e0n kh\u00e1c v\u1edbi b\u1ed9 ng\u1eaft m\u1ea1ch v\u1ecf \u0111\u00fac, v\u1ed1n \u0111\u01b0\u1ee3c ni\u00eam phong t\u1ea1i nh\u00e0 m\u00e1y.<\/p>\n<h3>T\u1ea1i sao b\u1ed9 ng\u1eaft m\u1ea1ch \u0111i\u1ec7n \u00e1p c\u00f3 th\u1ec3 \u0111\u01b0\u1ee3c t\u00e1i ch\u1ebf<\/h3>\n<p>B\u1ed9 ng\u1eaft m\u1ea1ch \u0111\u01b0\u1ee3c thi\u1ebft k\u1ebf \u0111\u1ec3 cho ph\u00e9p b\u1ea3o tr\u00ec. C\u00e1c \u0111\u1eb7c t\u00ednh c\u1ee7a ch\u00fang bao g\u1ed3m:<\/p>\n<ul>\n<li>Ti\u1ebfp \u0111i\u1ec3m c\u00f3 th\u1ec3 thay th\u1ebf \u2013 c\u00f3 th\u1ec3 ki\u1ec3m tra v\u00e0 thay th\u1ebf ti\u1ebfp \u0111i\u1ec3m h\u1ed3 quang v\u00e0 ti\u1ebfp \u0111i\u1ec3m ch\u00ednh<\/li>\n<li>C\u01a1 ch\u1ebf v\u1eadn h\u00e0nh d\u1ec5 ti\u1ebfp c\u1eadn \u2013 c\u00f3 th\u1ec3 b\u1ea3o tr\u00ec l\u00f2 xo, li\u00ean k\u1ebft v\u00e0 ch\u1ed1t c\u1ee7a c\u00f4ng t\u1eafc<\/li>\n<li>\u0110\u01a1n v\u1ecb ng\u1eaft m\u1ea1ch c\u00f3 th\u1ec3 thay th\u1ebf \u2013 c\u00f3 th\u1ec3 n\u00e2ng c\u1ea5p c\u00e1c \u0111\u01a1n v\u1ecb ng\u1eaft m\u1ea1ch \u0111i\u1ec7n t\u1eed c\u1ee7a c\u00e1c b\u1ed9 ng\u1eaft m\u1ea1ch<\/li>\n<li>Thi\u1ebft k\u1ebf r\u00fat ra \u2013 b\u1ed9 ng\u1eaft c\u00f3 th\u1ec3 \u0111\u01b0\u1ee3c th\u00e1o ra kh\u1ecfi b\u1ea3ng \u0111i\u1ec1u khi\u1ec3n m\u00e0 kh\u00f4ng c\u1ea7n t\u1eaft ngu\u1ed3n \u0111i\u1ec7n<\/li>\n<li>H\u1ec7 th\u1ed1ng c\u00e1ch \u0111i\u1ec7n r\u1ed9ng r\u00e3i \u2013 l\u1edbp c\u00e1ch \u0111i\u1ec7n hi\u1ec7n c\u00f3 c\u00f3 th\u1ec3 \u0111\u01b0\u1ee3c l\u00e0m s\u1ea1ch, ki\u1ec3m tra v\u00e0 ph\u1ee5c h\u1ed3i<\/li>\n<\/ul>\n<p>\u0110\u1ec3 bi\u1ebft th\u00eam v\u1ec1 s\u1ef1 kh\u00e1c bi\u1ec7t gi\u1eefa c\u00e1c lo\u1ea1i b\u1ed9 ng\u1eaft, h\u01b0\u1edbng d\u1eabn c\u1ee7a ch\u00fang t\u00f4i v\u1ec1 <a href=\"https:\/\/huyuglobal.com\/vi\/blog\/what-is-mccb-and-mcb\/\">MCCB v\u00e0 MCB l\u00e0 g\u00ec<\/a> bao g\u1ed3m c\u00e1c kh\u00e1c bi\u1ec7t v\u1ec1 c\u1ea5u tr\u00fac quy\u1ebft \u0111\u1ecbnh kh\u1ea3 n\u0103ng b\u1ea3o tr\u00ec.<\/p>\n<h2 id=\"prohibited-types\">C\u00e1c lo\u1ea1i b\u1ed9 ng\u1eaft m\u1ea1ch b\u1ecb c\u1ea5m t\u00e1i ch\u1ebf<\/h2>\n<p>Theo NEC 2020, c\u00f3 nh\u1eefng thi\u1ebft b\u1ecb b\u1ecb c\u1ea5m t\u00e1i ch\u1ebf. C\u00e1c l\u1ec7nh c\u1ea5m n\u00e0y xu\u1ea5t ph\u00e1t t\u1eeb th\u1ef1c t\u1ebf r\u1eb1ng t\u00ednh ch\u1ea5t an to\u00e0n quan tr\u1ecdng c\u1ee7a thi\u1ebft b\u1ecb n\u00e0y khi\u1ebfn b\u1ea5t k\u1ef3 thay \u0111\u1ed5i n\u00e0o b\u00ean trong \u0111\u1ec1u \u1ea3nh h\u01b0\u1edfng \u0111\u1ebfn c\u00e1c t\u00ednh n\u0103ng an to\u00e0n c\u1ee7a n\u00f3.<\/p>\n<p style=\"text-align: center;\"><img loading=\"lazy\" decoding=\"async\" class=\"alignnone size-full wp-image-3574\" src=\"https:\/\/huyuglobal.com\/wp-content\/uploads\/2026\/08\/Circuit-Breaker-Types-Prohibited-from-Reconditioning.webp\" alt=\"C\u00e1c lo\u1ea1i b\u1ed9 ng\u1eaft m\u1ea1ch b\u1ecb c\u1ea5m t\u00e1i ch\u1ebf\" width=\"1448\" height=\"1086\" \/><\/p>\n<table>\n<thead>\n<tr>\n<th>Thi\u1ebft b\u1ecb b\u1ecb c\u1ea5m<\/th>\n<th>Tham chi\u1ebfu NEC<\/th>\n<th>L\u00fd do<\/th>\n<\/tr>\n<\/thead>\n<tbody>\n<tr>\n<td><strong>B\u1ed9 ng\u1eaft m\u1ea1ch v\u1ecf \u0111\u00fac (MCCBs)<\/strong><\/td>\n<td>88(A)(1)<\/td>\n<td>Ni\u00eam phong t\u1ea1i nh\u00e0 m\u00e1y; ph\u00e1 v\u1ee1 ni\u00eam phong s\u1ebd l\u00e0m m\u1ea5t hi\u1ec7u l\u1ef1c danh s\u00e1ch UL v\u00e0 hi\u1ec7u chu\u1ea9n<\/td>\n<\/tr>\n<tr>\n<td><strong>Thi\u1ebft b\u1ecb b\u1ea3o v\u1ec7 GFCI<\/strong><\/td>\n<td>210.15(1)<\/td>\n<td>B\u1ea3o v\u1ec7 nh\u00e2n s\u1ef1 quan tr\u1ecdng v\u1ec1 an to\u00e0n; hi\u1ec7u chu\u1ea9n kh\u00f4ng th\u1ec3 x\u00e1c minh sau khi t\u00e1i ch\u1ebf<\/td>\n<\/tr>\n<tr>\n<td><strong>Thi\u1ebft b\u1ecb b\u1ea3o v\u1ec7 AFCI<\/strong><\/td>\n<td>210.15(2)<\/td>\n<td>\u0110i\u1ec7n t\u1eed ph\u1ee9c t\u1ea1p ph\u00e1t hi\u1ec7n d\u1ea5u hi\u1ec7u h\u1ed3 quang; t\u00e1i ch\u1ebf c\u00f3 th\u1ec3 b\u1ecf s\u00f3t s\u1ef1 suy gi\u1ea3m tinh vi<\/td>\n<\/tr>\n<tr>\n<td><strong>B\u1ea3o v\u1ec7 thi\u1ebft b\u1ecb ch\u1ed1ng s\u1ef1 c\u1ed1 n\u1ed1i \u0111\u1ea5t (GFPE)<\/strong><\/td>\n<td>210.15(3)<\/td>\n<td>Ch\u1ee9c n\u0103ng b\u1ea3o v\u1ec7 thi\u1ebft b\u1ecb ph\u1ea3i gi\u1eef nguy\u00ean hi\u1ec7u chu\u1ea9n t\u1eeb nh\u00e0 m\u00e1y<\/td>\n<\/tr>\n<tr>\n<td><strong>\u0110\u01a1n v\u1ecb ng\u1eaft \u0111i\u1ec7n t\u1eed cho b\u1ed9 ng\u1eaft \u0111i\u1ec7n \u00e1p th\u1ea5p<\/strong><\/td>\n<td>88(B)<\/td>\n<td>\u0110i\u1ec7n t\u1eed kh\u00f4ng th\u1ec3 t\u00e1i ch\u1ebf \u0111\u00e1ng tin c\u1eady; ph\u1ea3i thay th\u1ebf b\u1eb1ng thi\u1ebft b\u1ecb m\u1edbi<\/td>\n<\/tr>\n<tr>\n<td><strong>B\u1ea3ng \u0111i\u1ec1u khi\u1ec3n<\/strong><\/td>\n<td>8(A)<\/td>\n<td>T\u00ednh to\u00e0n v\u1eb9n c\u1ea5u tr\u00fac v\u00e0 k\u1ebft n\u1ed1i bus kh\u00f4ng th\u1ec3 x\u00e1c minh sau khi t\u00e1i ch\u1ebf<\/td>\n<\/tr>\n<tr>\n<td><strong>C\u00f4ng t\u1eafc chuy\u1ec3n m\u1ea1ch (h\u1ec7 th\u1ed1ng kh\u1ea9n c\u1ea5p)<\/strong><\/td>\n<td>5(C), 701.5(C), 702.5(A)<\/td>\n<td>\u1ee8ng d\u1ee5ng an to\u00e0n t\u00ednh m\u1ea1ng y\u00eau c\u1ea7u thi\u1ebft b\u1ecb m\u1edbi<\/td>\n<\/tr>\n<tr>\n<td><strong>B\u1ed9 \u0111i\u1ec1u khi\u1ec3n b\u01a1m ch\u1eefa ch\u00e1y<\/strong><\/td>\n<td>695.10<\/td>\n<td>Thi\u1ebft b\u1ecb an to\u00e0n t\u00ednh m\u1ea1ng quan tr\u1ecdng<\/td>\n<\/tr>\n<tr>\n<td><strong>\u1ed4 c\u1eafm v\u00e0 ph\u00edch c\u1eafm g\u1eafn k\u00e8m<\/strong><\/td>\n<td>3(A), 406.7<\/td>\n<td>M\u00f2n v\u00e0 suy gi\u1ea3m ti\u1ebfp x\u00fac kh\u00f4ng th\u1ec3 ph\u00e1t hi\u1ec7n \u0111\u00e1ng tin c\u1eady<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<p>Nh\u1ea5n m\u1ea1nh v\u1ec1 MCCB: M\u1eb7c d\u00f9 tr\u01b0\u1edbc \u0111\u00e2y m\u1ed9t s\u1ed1 ki\u1ec3m tra v\u00e0 th\u1ef1c h\u00e0nh b\u1ea3o tr\u00ec ph\u00f2ng ng\u1eeba \u0111\u01b0\u1ee3c ph\u00e9p theo ti\u00eau chu\u1ea9n NEMA AB 4, c\u1ea7n l\u01b0u \u00fd r\u1eb1ng vi\u1ec7c t\u00e1i ch\u1ebf b\u1ed9 ng\u1eaft m\u1ea1ch v\u1ecf \u0111\u00fac \u0111\u00e3 b\u1ecb c\u1ea5m trong phi\u00ean b\u1ea3n NEC m\u1edbi nh\u1ea5t n\u0103m 2020. B\u1ea3o tr\u00ec (v\u1ec7 sinh, v\u1eadn h\u00e0nh th\u1eed, ki\u1ec3m tra l\u1ef1c si\u1ebft) v\u1eabn h\u1ee3p l\u1ec7 nh\u01b0ng kh\u00f4ng \u0111\u01b0\u1ee3c ph\u00e9p th\u00e1o r\u1eddi c\u1ea5u tr\u00fac b\u00ean trong v\u00e0 t\u00e1i c\u1ea5u tr\u00fac b\u1ed9 ng\u1eaft m\u1ea1ch v\u1ecf \u0111\u00fac.<\/p>\n<h2>C\u00e1c th\u01b0\u01a1ng hi\u1ec7u h\u1ed7 tr\u1ee3 t\u00e1i ch\u1ebf b\u1ed9 ng\u1eaft m\u1ea1ch<\/h2>\n<p>C\u00e1c nh\u00e0 s\u1ea3n xu\u1ea5t n\u1ed5i ti\u1ebfng kh\u00e1c nhau qu\u1ea3n l\u00fd c\u00e1c ch\u01b0\u01a1ng tr\u00ecnh t\u00e1i ch\u1ebf \u0111\u01b0\u1ee3c \u1ee7y quy\u1ec1n b\u1edfi nh\u00e0 m\u00e1y c\u1ee7a h\u1ecd. H\u1ecd kh\u00f4ng s\u1eed d\u1ee5ng c\u00e1c \u0111\u01a1n v\u1ecb t\u00e2n trang l\u00e0m vi\u1ec7c thay m\u1eb7t cho c\u00e1c c\u00f4ng ty kh\u00e1c.<\/p>\n<table>\n<thead>\n<tr>\n<th>Th\u01b0\u01a1ng Hi\u1ec7u<\/th>\n<th>T\u00ean ch\u01b0\u01a1ng tr\u00ecnh<\/th>\n<th>Ph\u1ea1m vi<\/th>\n<th>B\u1ea3o H\u00e0nh<\/th>\n<\/tr>\n<\/thead>\n<tbody>\n<tr>\n<td><strong>Eaton<\/strong><\/td>\n<td>T\u00e1i ch\u1ebf lo\u1ea1i 1 (Trung t\u00e2m t\u00e1i ch\u1ebf b\u1ed9 ng\u1eaft \u0111i\u1ec7n)<\/td>\n<td>B\u1ed9 ng\u1eaft \u0111i\u1ec7n LV\/MV c\u1ee7a Eaton v\u00e0 kh\u00f4ng ph\u1ea3i Eaton; t\u00e1i s\u1ea3n xu\u1ea5t Magnum DS; n\u00e2ng c\u1ea5p VCP-W FAME<\/td>\n<td>3 n\u0103m (1 n\u0103m cho \u1ee9ng d\u1ee5ng kh\u1edfi \u0111\u1ed9ng \u0111\u1ed9ng c\u01a1)<\/td>\n<\/tr>\n<tr>\n<td><strong>ABB<\/strong><\/td>\n<td>T\u00e2n trang b\u1ed9 ng\u1eaft t\u1ea1i trung t\u00e2m d\u1ecbch v\u1ee5<\/td>\n<td>B\u1ed9 ng\u1eaft ABB v\u00e0 kh\u00f4ng ph\u1ea3i ABB; h\u1ea1t nh\u00e2n v\u00e0 phi h\u1ea1t nh\u00e2n; LV v\u00e0 MV<\/td>\n<td>1 n\u0103m ph\u1ee5 t\u00f9ng v\u00e0 lao \u0111\u1ed9ng<\/td>\n<\/tr>\n<tr>\n<td><strong>Schneider Electric \/ Square D<\/strong><\/td>\n<td>Gi\u1ea3i ph\u00e1p hi\u1ec7n \u0111\u1ea1i h\u00f3a \/ T\u00e1i ch\u1ebf b\u1ed9 ng\u1eaft m\u1ea1ch<\/td>\n<td>Square D v\u00e0 h\u1ea7u h\u1ebft c\u00e1c th\u01b0\u01a1ng hi\u1ec7u OEM l\u1edbn; b\u1ed9 ng\u1eaft LV v\u00e0 MV; hi\u1ec7n \u0111\u1ea1i h\u00f3a thi\u1ebft b\u1ecb \u0111\u00f3ng c\u1eaft<\/td>\n<td>Thay \u0111\u1ed5i theo ph\u1ea1m vi<\/td>\n<\/tr>\n<tr>\n<td><strong>Siemens<\/strong><\/td>\n<td>Ch\u01b0\u01a1ng tr\u00ecnh d\u1ecbch v\u1ee5 &amp; t\u00e1i ch\u1ebf<\/td>\n<td>Siemens v\u00e0 c\u00e1c th\u01b0\u01a1ng hi\u1ec7u c\u0169 (ITE, Gould); b\u1ed9 ng\u1eaft \u0111i\u1ec7n LV v\u00e0 MV<\/td>\n<td>Thay \u0111\u1ed5i theo ch\u01b0\u01a1ng tr\u00ecnh<\/td>\n<\/tr>\n<tr>\n<td><strong>GE \/ Vertiv<\/strong><\/td>\n<td>D\u1ecbch v\u1ee5 t\u00e1i ch\u1ebf<\/td>\n<td>B\u1ed9 ng\u1eaft GE v\u00e0 c\u00e1c th\u01b0\u01a1ng hi\u1ec7u c\u0169; b\u1ed9 ng\u1eaft MV v\u00e0 HV<\/td>\n<td>Thay \u0111\u1ed5i theo ch\u01b0\u01a1ng tr\u00ecnh<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<h3>M\u1ed7i th\u01b0\u01a1ng hi\u1ec7u cung c\u1ea5p g\u00ec<\/h3>\n<p>T\u1ea1i khu v\u1ef1c B\u1eafc M\u1ef9, Eaton \u0111\u00e3 th\u00e0nh l\u1eadp n\u0103m Trung t\u00e2m t\u00e1i ch\u1ebf b\u1ed9 ng\u1eaft \u0111i\u1ec7n. Giao th\u1ee9c lo\u1ea1i 1 c\u1ee7a h\u1ecd bao g\u1ed3m th\u00e1o r\u1eddi ho\u00e0n to\u00e0n c\u00e1c b\u1ed9 ph\u1eadn, v\u1ec7 sinh theo ti\u00eau chu\u1ea9n linh ki\u1ec7n, l\u00e0m m\u1edbi b\u1ec1 m\u1eb7t, v\u00e0 cu\u1ed1i c\u00f9ng l\u00e0 ki\u1ec3m tra hi\u1ec7u su\u1ea5t cu\u1ed1i c\u00f9ng. H\u1ecd c\u0169ng ph\u00e1t tri\u1ec3n kh\u00e1i ni\u1ec7m n\u00e2ng c\u1ea5p FAME cho m\u1ed9t s\u1ed1 b\u1ed9 ng\u1eaft \u0111i\u1ec7n \u00e1p trung b\u00ecnh c\u1ee5 th\u1ec3 c\u0169ng nh\u01b0 c\u1ea3i ti\u1ebfn b\u1ed9 ng\u1eaft m\u1ea1ch v\u1edbi \u0111\u01a1n v\u1ecb ng\u1eaft Digitrip RMS v\u00e0 H\u1ec7 th\u1ed1ng B\u1ea3o tr\u00ec Gi\u1ea3m H\u1ed3 quang. M\u1ed7i b\u1ed9 ng\u1eaft \u0111\u01b0\u1ee3c t\u00e1i ch\u1ebf \u0111\u1ec1u \u0111\u01b0\u1ee3c th\u00eam v\u00e0o c\u01a1 s\u1edf d\u1eef li\u1ec7u trung t\u00e2m Pow-R-DB.<\/p>\n<p>T\u1ea1i c\u00e1c trung t\u00e2m d\u1ecbch v\u1ee5 c\u1ee7a h\u1ecd, ABB cung c\u1ea5p d\u1ecbch v\u1ee5 ki\u1ec3m tra l\u1ea1i cho c\u1ea3 c\u00e1c m\u1eabu c\u1ea7u dao c\u1ee7a ch\u00ednh h\u1ecd v\u00e0 c\u1ee7a c\u00e1c nh\u00e0 s\u1ea3n xu\u1ea5t kh\u00e1c. D\u1ecbch v\u1ee5 c\u1ee7a h\u1ecd bao g\u1ed3m ti\u1ebfp nh\u1eadn thi\u1ebft b\u1ecb, ki\u1ec3m tra v\u00e0 th\u1eed nghi\u1ec7m, c\u0169ng nh\u01b0 th\u00e1o r\u1eddi thi\u1ebft b\u1ecb. Ngo\u00e0i vi\u1ec7c l\u00e0m s\u1ea1ch t\u1ea5t c\u1ea3 c\u00e1c b\u1ed9 ph\u1eadn, ABB c\u0169ng s\u1ebd ki\u1ec3m tra c\u00e1c v\u1ebft n\u1ee9t, \u0111\u1ea3m b\u1ea3o thay th\u1ebf c\u00e1c b\u1ed9 ph\u1eadn \u0111\u00e3 b\u1ecb h\u01b0 h\u1ecfng, b\u00f4i tr\u01a1n t\u1ea5t c\u1ea3 c\u00e1c \u0111i\u1ec3m chuy\u1ec3n \u0111\u1ed9ng, sau \u0111\u00f3 l\u1eafp r\u00e1p l\u1ea1i.<\/p>\n<p>Trong ch\u01b0\u01a1ng tr\u00ecnh Gi\u1ea3i ph\u00e1p Hi\u1ec7n \u0111\u1ea1i h\u00f3a c\u1ee7a m\u00ecnh, Schneider Electric \u0111\u00e3 m\u1eddi d\u1ecbch v\u1ee5 t\u00e1i c\u1ea5u h\u00ecnh c\u00e1c c\u1ea7u dao \u0111i\u1ec7n \u00e1p th\u1ea5p v\u00e0 trung b\u00ecnh. Vi\u1ec7c t\u00e1i \u0111i\u1ec1u ch\u1ec9nh \u0111\u01b0\u1ee3c th\u1ef1c hi\u1ec7n qua c\u00e1c b\u01b0\u1edbc sau: qua t\u1ea5t c\u1ea3 c\u00e1c giai \u0111o\u1ea1n, bao g\u1ed3m thay th\u1ebf m\u1ed9t ph\u1ea7n c\u00e1c th\u00e0nh ph\u1ea7n, r\u1eeda v\u00e0 s\u01a1n c\u00e1c chi ti\u1ebft, v\u00e0 b\u00f4i tr\u01a1n.<\/p>\n<h2>Ti\u00eau chu\u1ea9n ch\u00ednh: NEC, NEMA AB 4, IEEE C37.59 &amp; UL 489<\/h2>\n<p>Nhi\u1ec1u ti\u00eau chu\u1ea9n \u0111i\u1ec1u ch\u1ec9nh <strong>vi\u1ec7c t\u00e1i \u0111i\u1ec1u ch\u1ec9nh c\u1ea7u dao<\/strong>. Hi\u1ec3u r\u00f5 ti\u00eau chu\u1ea9n n\u00e0o \u00e1p d\u1ee5ng cho t\u00ecnh hu\u1ed1ng c\u1ee7a b\u1ea1n l\u00e0 \u0111i\u1ec1u c\u1ea7n thi\u1ebft \u0111\u1ec3 tu\u00e2n th\u1ee7 m\u00e3 quy \u0111\u1ecbnh:<\/p>\n<table>\n<thead>\n<tr>\n<th>Ti\u00eau chu\u1ea9n<\/th>\n<th>Nh\u00e0 xu\u1ea5t b\u1ea3n<\/th>\n<th>Ph\u1ea1m vi<\/th>\n<\/tr>\n<\/thead>\n<tbody>\n<tr>\n<td><strong>NEC Article 210.15 &amp; 240.88<\/strong><\/td>\n<td>NFPA<\/td>\n<td>Defines what can and cannot be reconditioned; requires listing as &#8220;reconditioned&#8221;<\/td>\n<\/tr>\n<tr>\n<td><strong>NEMA AB 4<\/strong><\/td>\n<td>NEMA<\/td>\n<td>Guidelines for inspection and preventive maintenance of molded-case breakers (not reconditioning)<\/td>\n<\/tr>\n<tr>\n<td><strong>IEEE C37.59<\/strong><\/td>\n<td>IEEE<\/td>\n<td>Standard for reconditioning power switchgear equipment; defines the reconditioning process<\/td>\n<\/tr>\n<tr>\n<td><strong>UL 489<\/strong><\/td>\n<td>UL<\/td>\n<td>Standard for molded-case circuit breakers; relevant as a testing benchmark<\/td>\n<\/tr>\n<tr>\n<td><strong>NEMA Policy on Reconditioned Equipment<\/strong><\/td>\n<td>NEMA<\/td>\n<td>Industry positions on suitability and safety of reconditioned equipment<\/td>\n<\/tr>\n<tr>\n<td><strong>PEARL Standards<\/strong><\/td>\n<td>PEARL<\/td>\n<td>ANSI-accredited standards for inspecting, testing, and reconditioning electrical apparatus<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<p>The essential factor: the initial marking must be taken away and the equipment must be identified as reconditioned when it is refurbished. UL provides a certification procedure for reconstructed equipment. The devices renovated in compliance with the procedure are marked with the UL Mark containing the word &#8220;Rebuilt,&#8221; &#8220;Remanufactured,&#8221; &#8220;Rebuilt,&#8221; or &#8220;Reconditioned.&#8221; For more on breaker standards, see our article on <a href=\"https:\/\/huyuglobal.com\/vi\/blog\/what-is-ul-489-breakers\/\">UL 489 breaker requirements<\/a>.<\/p>\n<h2>The Reconditioning Process Step by Step<\/h2>\n<p>According to Eaton Class 1 and IEEE C37.59, this is the process undertaken when the circuit breaker needs reconditioning:<\/p>\n<p style=\"text-align: center;\"><img loading=\"lazy\" decoding=\"async\" class=\"alignnone size-full wp-image-3575\" src=\"https:\/\/huyuglobal.com\/wp-content\/uploads\/2026\/08\/The-Reconditioning-Process-Step-by-Step.webp\" alt=\"The Reconditioning Process Step by Step\" width=\"1448\" height=\"1086\" \/><\/p>\n<h3>Step 1: Incoming Inspection &amp; Testing<\/h3>\n<p>The breaker is received, visually inspected, and tested in the &#8220;as received&#8221; condition to document baseline performance. The important measurements taken include contact resistance (in millivolts) insulation resistance, mechanical operating effort and dimensions. The information obtained is documented.<\/p>\n<h3>Step 2: Complete Disassembly<\/h3>\n<p>The disassembly of the breaker is complete and the breaker has been taken apart into its components including: the operating system, the arc chute, the insulation barrier, frame and other systems. This is the stage where one identifies flaws such as, the faulty drive link, or misaligned contacts, damaged insulation that makes the whole device liable to failure when the fault is detected.<\/p>\n<h3>Step 3: Component-Specific Cleaning<\/h3>\n<p>Various types of materials need various types of cleaning processes. The non-current components are cleaned thoroughly in such a way that no foreign material is left while dielectric and structural characteristics are preserved. The current components are cleaned without damaging the original plating. Contact surfaces are regenerated so that metallurgy and contact pressure play their role properly.<\/p>\n<h3>Step 4: Inspection &amp; Part Replacement<\/h3>\n<p>All parts should be checked for cracks, deterioration, rust, and size accuracy. Parts that have worn out are replaced by new OEM parts, while parts that are not in production anymore will need to be replaced with reverse-engineered components which must comply with standards stated in IEEE C37.59. Such components may require verification in strict laboratory conditions such as examples of high-power testing. The typical substitutes for the worn parts may be springs, contacts, shunts, and bushing.<\/p>\n<h3>Step 5: Re-Lubrication<\/h3>\n<p>All outdated lubricants have been eliminated, and the machine and connection points are relubricated using grease specified by the manufacturer. One of the key reasons that circuit breakers fail is due to inappropriate lubrication \u2014 stiff mechanisms slow down the process of trouble clearing, which results in much higher arc flash incident energy.<\/p>\n<h3>Step 6: Reassembly to OEM Specifications<\/h3>\n<p>In the process of reassembling the breaker, the OEM documentation is utilized. However, if OEM information is not available, for instance if the original manufacturer is defunct, Eaton will instead use the centralized Pow-R-DB database of records from similar breakers that are proven to give desired outcomes.<\/p>\n<h3>Step 7: Final Testing<\/h3>\n<p>The rebuilt circuit breaker will go through conclusive testing as per IEEE and NEMA guidelines including:<\/p>\n<ul>\n<li>Insulation resistance assessment<\/li>\n<li>Contact resistance test (millivolt drop)<\/li>\n<li>Mechanical operation assessment (open-close timing)<\/li>\n<li>Overcurrent trip test (long-time, short-time, instantaneous trip)<\/li>\n<li>Dielectric withstand assessment<\/li>\n<\/ul>\n<h3>Step 8: Documentation &amp; Labeling<\/h3>\n<p>The production of the test report occurs to establish a contrast between &#8220;as received&#8221; and &#8220;final&#8221; test findings, supported by information mentioning all the fixed components. The circuit breaker is provided with a traceability label signifying it as reconditioned, which indicates the name as well as the date of the reconditioning firm. The circuit breaker is operational again.<\/p>\n<h2>When to Choose Reconditioning vs. Replacement<\/h2>\n<p>The decision to recondition or replace depends on breaker type, age, criticality, and cost. Here&#8217;s a practical decision matrix:<\/p>\n<p style=\"text-align: center;\"><img loading=\"lazy\" decoding=\"async\" class=\"alignnone size-full wp-image-3576\" src=\"https:\/\/huyuglobal.com\/wp-content\/uploads\/2026\/08\/When-to-Choose-Reconditioning-vs-Replacement.webp\" alt=\"When to Choose Reconditioning vs. Replacement\" width=\"1448\" height=\"1086\" \/><\/p>\n<table>\n<thead>\n<tr>\n<th>Scenario<\/th>\n<th>Recommendation<\/th>\n<th>Reasoning<\/th>\n<\/tr>\n<\/thead>\n<tbody>\n<tr>\n<td>LV\/MV power circuit breaker in switchgear, 15\u201330 years old<\/td>\n<td><strong>Recondition<\/strong><\/td>\n<td>Designed for maintenance; OEM parts available; 40\u201360% cheaper than new<\/td>\n<\/tr>\n<tr>\n<td>Power breaker with obsolete trip unit<\/td>\n<td><strong>Recondition + trip upgrade<\/strong><\/td>\n<td>New solid-state trip unit extends life and adds arc-flash reduction features<\/td>\n<\/tr>\n<tr>\n<td>MCCB in panelboard that&#8217;s failing<\/td>\n<td><strong>Replace<\/strong><\/td>\n<td>NEC prohibits MCCB reconditioning; replacement is the only code-compliant option<\/td>\n<\/tr>\n<tr>\n<td>GFCI or AFCI breaker<\/td>\n<td><strong>Replace<\/strong><\/td>\n<td>NEC 210.15 explicitly prohibits reconditioning of safety devices<\/td>\n<\/tr>\n<tr>\n<td>Power breaker with severe arc damage<\/td>\n<td><strong>Replace<\/strong><\/td>\n<td>Extensive damage may compromise structural integrity; reconditioning cost may exceed replacement<\/td>\n<\/tr>\n<tr>\n<td>Switchgear lineup needing modernization<\/td>\n<td><strong>Recondition breakers + retrofill<\/strong><\/td>\n<td>Extends switchgear life without total replacement; minimizes downtime<\/td>\n<\/tr>\n<tr>\n<td>Emergency system or life-safety circuit<\/td>\n<td><strong>Replace with new<\/strong><\/td>\n<td>Insurance and code requirements may mandate new equipment for critical circuits<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<p>For help diagnosing whether your breaker actually needs attention, see our guide on <a href=\"https:\/\/huyuglobal.com\/vi\/blog\/how-to-tell-if-a-breaker-is-bad\/\">c\u00e1ch nh\u1eadn bi\u1ebft m\u1ed9t c\u1ea7u dao b\u1ecb h\u1ecfng<\/a>. And if replacement is the right call, our article on <a href=\"https:\/\/huyuglobal.com\/vi\/blog\/how-much-to-replace-a-circuit-breaker\/\">how much it costs to replace a circuit breaker<\/a> covers pricing across breaker types and amperage ratings.<\/p>\n<h2>Cost Comparison: Reconditioned vs. New<\/h2>\n<p>When it comes to the reconditioning of circuit breakers, the expenses usually range between 40 and 60% of the total cost of acquiring new equipment. This is especially true for larger models that can help save lots of money:<\/p>\n<table>\n<thead>\n<tr>\n<th>Lo\u1ea1i C\u1ea7u Dao<\/th>\n<th>New Cost (Approx.)<\/th>\n<th>Reconditioned Cost (Approx.)<\/th>\n<th>Savings<\/th>\n<\/tr>\n<\/thead>\n<tbody>\n<tr>\n<td>LV power breaker, 800A frame<\/td>\n<td>$8,000\u2013$15,000<\/td>\n<td>$3,200\u2013$9,000<\/td>\n<td>40\u201360%<\/td>\n<\/tr>\n<tr>\n<td>LV power breaker, 3200A frame<\/td>\n<td>$20,000\u2013$40,000<\/td>\n<td>$8,000\u2013$24,000<\/td>\n<td>40\u201360%<\/td>\n<\/tr>\n<tr>\n<td>MV vacuum breaker, 5kV<\/td>\n<td>$15,000\u2013$30,000<\/td>\n<td>$6,000\u2013$18,000<\/td>\n<td>40\u201360%<\/td>\n<\/tr>\n<tr>\n<td>MV vacuum breaker, 15kV<\/td>\n<td>$25,000\u2013$50,000<\/td>\n<td>$10,000\u2013$30,000<\/td>\n<td>40\u201360%<\/td>\n<\/tr>\n<tr>\n<td>Trip unit upgrade (Digitrip\/AC-PRO)<\/td>\n<td>$3,000\u2013$8,000<\/td>\n<td>Included in reconditioning<\/td>\n<td>Bundle savings<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<p>Additional expenses: The reconditioning process saves costs associated with switchgear modification that would be needed in case of changes in size of a new breaker, minimizes lead time since reconditioned breakers arrive in 2-4 weeks in contrast to the new ones that will be delivered in 12-20 weeks, and reduces the downtime due to the fact that the reconditioned breaker can be immediately implemented in the current cubicle.<\/p>\n<h2 id=\"safety\">Safety Considerations &amp; Documentation Requirements<\/h2>\n<p>Reconditioning can be performed only by certified personnel in line with accepted standards. Here are the requirements that need to be checked before installation of a reconditioned circuit breaker:<\/p>\n<ul>\n<li>Labeling: The reconditioned circuit breaker is marked &#8220;Reconditioned&#8221; with the name of the reconditioning company and date.<\/li>\n<li>Test: Get a complete report evidencing &#8220;as received&#8221; and &#8220;final&#8221; test results along with a list of parts replaced.<\/li>\n<li>Certification: In case UL certification is required, verify that the circuit breaker is marked with UL Mark with &#8220;Rebuilt&#8221; or &#8220;Reconditioned.&#8221;<\/li>\n<li>Approval by AHJ: The Authority Having Jurisdiction (electrical inspector) may need proof of reconditioning by a certified company &#8211; stay prepared.<\/li>\n<li>Warranty: Verify the warranty conditions and length (Eaton: 3-year; ABB: 1-year; others vary).<\/li>\n<li>Traceability: The reconditioning company should do recordkeeping linked to the circuit breaker serial number for future reference.<\/li>\n<li>Do not install the reconditioned circuit breaker in the life-safety circuit unless the AHJ and your insurance agent approved the installation.<\/li>\n<\/ul>\n<p>Also, OSHA 29 CFR 1910.334(b)(2) states that once the circuit is de-energized with the protective device it is not allowed to re-energize it manually until it is determined that the equipment and circuit can be safely energized.<\/p>\n<h2>C\u00e2u h\u1ecfi th\u01b0\u1eddng g\u1eb7p<\/h2>\n<h3>What is a reconditioned circuit breaker?<\/h3>\n<p>A reconditioned power circuit breaker refers to a power circuit breaker which has undergone a restoration process at a factory-authorized facility. According to the requirements set forth by IEEE C37.59, the entire activity involves an incoming inspection, complete disassembly, cleaning of components, replacement of parts, reapplication of lubricants, reassembly of components according to OEM specifications, and final testing. In addition, the circuit breaker must be labeled as being reconditioned with the name and date of the reconditioning firm, and the original listing had to be taken off due to the NEC requirements.<\/p>\n<h3>What are type B, type C, and type D circuit breakers?<\/h3>\n<p>Types B, C, and D are classifications of MCBs regarding tripping characteristics and not types of circuit breakers classified according to NEC 240.88. Type B circuit breakers trip at three to five times the rated current; these are used in residential applications for circuits with purely resistive loads. After that, we have Type C circuit breakers, which trip at five to ten times the rated current and are used in commercial and industrial electrical systems, as well as circuits with inductive loads, such as fluorescent lights and small motors. The third type is Type D MCBs, which trip at ten to twenty times the rated current and deal with inrush current in transformers, large motors, or welding machines. All the above types of breakers are miniature circuit breakers, molded-cased, and cannot be reconditioned in accordance with NEC 240.88(A)(1).<\/p>\n<h3>Are molded case circuit breakers permitted to be reconditioned?<\/h3>\n<p>Based on the NEC Section 240.88(A)(1) in the year 2020, it is not allowed to refurbish molded- case circuit breakers. MCCBs come as sealed units hence breaking the seals means losing the UL listing and warranty of the manufacturer. Though there is guidance for inspection and preventive maintenance of MCCBs in the NEMA AB 4 guidelines, it is not equal to reconditioning. Routine maintenance is fine but disassembly or modification of the internal structure of the MCCB is not accepted.<\/p>\n<h3>Which type of equipment is not allowed to be reconditioned according to article 210?<\/h3>\n<p>The NEC states under Article 210.15 that there are three kinds of equipment that are not permitted to be reconditioned. These include (1) equipment that supplies personnel with ground-fault circuit interrupting (GFCI) protection, (2) equipment that supplies arc-fault circuit interrupting (AFCI) protection, and (3) equipment that provides ground-fault protection for equipment (GFPE). The reason for these prohibitions is that the devices that are required to be reconditioned are also safety critical devices that possess calibration and sensitivity requirements that cannot be assured even after they are reconditioned. Thus, if any of the reconditioned devices (GFCI, AFCI, or GFPE) fails to trip at the required threshold, then a life hazard will be created. Also, the NEC states that molded circuit breakers cannot be reconditioned by Section 240.88(A)(1) nor can the electronic trip units of low-voltage power circuit breakers be reconditioned according to Section 240.88(B).<\/p>\n<h2>T\u00e0i li\u1ec7u tham kh\u1ea3o<\/h2>\n<ul>\n<li><a href=\"https:\/\/www.nfpa.org\/codes-and-standards\/nfpa-70-standard-development\/70\" target=\"_blank\" rel=\"nofollow noopener\">NFPA 70 \u2014 National Electrical Code (NEC) 2020, Articles 210.15 and 240.88<\/a><\/li>\n<li><a href=\"https:\/\/www.nema.org\/standards\/view\/guidelines-for-inspection-and-preventive-maintenance-of-molded-case-circuit-breakers-used-in-commercial-and-industrial\" target=\"_blank\" rel=\"nofollow noopener\">ANSI\/NEMA AB 4-2023 \u2014 Guidelines for Inspection and Preventive Maintenance of Molded Case Circuit Breakers<\/a><\/li>\n<li><a href=\"https:\/\/standards.ieee.org\/ieee\/C37.59\/10366\/\" target=\"_blank\" rel=\"nofollow noopener\">IEEE C37.59-2018 \u2014 Standard for Reconditioning Power Switchgear Equipment<\/a><\/li>\n<li><a href=\"https:\/\/www.shopul.com\/product\/ul-489\" target=\"_blank\" rel=\"nofollow noopener\">UL 489 \u2014 Standard for Molded-Case Circuit Breakers, Molded-Case Switches and Circuit Breaker Enclosures<\/a><\/li>\n<li><a href=\"https:\/\/www.ul.com\/news\/reconditioned-electrical-equipment-2020-nec-guide\" target=\"_blank\" rel=\"nofollow noopener\">UL \u2014 Reconditioned Electrical Equipment: A 2020 NEC Guide<\/a><\/li>\n<li><a href=\"https:\/\/www.eaton.com\/us\/en-us\/catalog\/services\/electrical-distribution-services\/class-1-reconditioning.html\" target=\"_blank\" rel=\"nofollow noopener\">Eaton \u2014 Class 1 Circuit Breaker Reconditioning for Low- and Medium-Voltage Power Circuit Breakers<\/a><\/li>\n<li><a href=\"https:\/\/new.abb.com\/service\/service-centers\/breaker-refurbishment-services\" target=\"_blank\" rel=\"nofollow noopener\">ABB \u2014 Service Center Breaker Refurbishment Services<\/a><\/li>\n<li><a href=\"https:\/\/www.se.com\/us\/en\/work\/services\/field-services\/electrical-distribution\/\" target=\"_blank\" rel=\"nofollow noopener\">Schneider Electric \u2014 Electrical Distribution Modernization and Upgrade Solutions<\/a><\/li>\n<li><a href=\"https:\/\/www.pearl1.org\/\" target=\"_blank\" rel=\"nofollow noopener\">PEARL \u2014 Professional Electrical Apparatus Reconditioning League<\/a><\/li>\n<\/ul>\n<p>Reconditionable circuit breakers include low-voltage, medium-voltage, and high-voltage circuit breakers of the draw-out, field-serviceable type that are commonly used in substations and switchgear. The design of the circuit breaker makes use of replaceable contacts, easily accessible mechanism, and interchangeable trip units allowing practical reconditioning in compliance with NEC 240.88. Major manufacturers such as Eaton, ABB, and Schneider Electric offer the reconditioning service according to IEEE C37.59 standards guaranteeing warranties comparable to what new equipment receives.<\/p>\n<p>On the other hand, molded-case circuit breakers, GFCI devices, AFCI devices, and GFPE equipment are unconditionally prohibited from being reconditioned as per NEC 210.15 and 240.88 and must be replaced if broken. The 2020 NEC has made it clear that circuit breakers designed to be maintained may be maintained while sealed safety-critical breakers may not. When opting for reconditioning or replacement, identify the type of circuit breakers first and compare the cost of failure, so you are able to understand what is worth doing more \u2014 reconditioning or replacing the circuit breaker.<\/p>","protected":false},"excerpt":{"rendered":"<p>In case your facility uses outdated switchgears, you may wonder whether you can refurbish your circuit breakers or should obtain brand new gadgets. The answer is not that simple, as it depends on a type of circuit breaker in your facility. As stated by the National Electrical Code (NEC) of 2020, low-voltage power circuit breakers, [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":3572,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_gspb_post_css":"","footnotes":""},"categories":[1],"tags":[],"class_list":["post-3571","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-blogs"],"blocksy_meta":[],"_links":{"self":[{"href":"https:\/\/huyuglobal.com\/vi\/wp-json\/wp\/v2\/posts\/3571","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/huyuglobal.com\/vi\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/huyuglobal.com\/vi\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/huyuglobal.com\/vi\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/huyuglobal.com\/vi\/wp-json\/wp\/v2\/comments?post=3571"}],"version-history":[{"count":3,"href":"https:\/\/huyuglobal.com\/vi\/wp-json\/wp\/v2\/posts\/3571\/revisions"}],"predecessor-version":[{"id":3579,"href":"https:\/\/huyuglobal.com\/vi\/wp-json\/wp\/v2\/posts\/3571\/revisions\/3579"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/huyuglobal.com\/vi\/wp-json\/wp\/v2\/media\/3572"}],"wp:attachment":[{"href":"https:\/\/huyuglobal.com\/vi\/wp-json\/wp\/v2\/media?parent=3571"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/huyuglobal.com\/vi\/wp-json\/wp\/v2\/categories?post=3571"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/huyuglobal.com\/vi\/wp-json\/wp\/v2\/tags?post=3571"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}