{"id":20887,"date":"2025-12-16T23:58:05","date_gmt":"2025-12-16T15:58:05","guid":{"rendered":"https:\/\/viox.com\/?p=20887"},"modified":"2025-12-16T23:58:07","modified_gmt":"2025-12-16T15:58:07","slug":"circuit-breakers-vs-supplementary-protection","status":"publish","type":"post","link":"https:\/\/test.viox.com\/vi\/circuit-breakers-vs-supplementary-protection\/","title":{"rendered":"Aptomat (MCB\/MCCB) so v\u1edbi B\u1ea3o v\u1ec7 B\u1ed5 sung"},"content":{"rendered":"<div class=\"product-intro\">\n<p>Trong t\u1ee7 \u0111i\u1ec7n \u0111i\u1ec1u khi\u1ec3n, b\u1ea1n c\u00f3 th\u1ec3 b\u1eaft g\u1eb7p hai thi\u1ebft b\u1ecb g\u1eafn tr\u00ean DIN rail g\u1ea7n nh\u01b0 gi\u1ed1ng h\u1ec7t nhau: c\u00f9ng k\u00edch th\u01b0\u1edbc, c\u00f9ng c\u01b0\u1eddng \u0111\u1ed9 d\u00f2ng \u0111i\u1ec7n, c\u00f9ng c\u1ea7n g\u1ea1t. M\u1ed9t c\u00e1i gi\u00e1 50 \u0111\u00f4 la. C\u00e1i c\u00f2n l\u1ea1i? Ch\u1ec9 15 \u0111\u00f4 la. S\u1ef1 kh\u00e1c bi\u1ec7t kh\u00f4ng ph\u1ea3i l\u00e0 ti\u1ebfp th\u1ecb\u2014m\u00e0 l\u00e0 quy \u0111\u1ecbnh.<\/p>\n<p>Kho\u1ea3ng c\u00e1ch v\u1ec1 gi\u00e1 n\u00e0y \u0111\u00e1nh d\u1ea5u m\u1ed9t s\u1ef1 ph\u00e2n chia quy \u0111\u1ecbnh quan tr\u1ecdng. C\u00e1c x\u01b0\u1edfng l\u1eafp r\u00e1p t\u1ee7 \u0111i\u1ec7n, nh\u00e0 s\u1ea3n xu\u1ea5t OEM v\u00e0 nh\u00e0 th\u1ea7u \u0111i\u1ec7n c\u1ea7n hi\u1ec3u r\u00f5 s\u1ef1 kh\u00e1c bi\u1ec7t gi\u1eefa c\u1ea7u dao UL 489 v\u00e0 b\u1ed9 b\u1ea3o v\u1ec7 b\u1ed5 sung UL 1077. N\u1ebfu nh\u1ea7m l\u1eabn ch\u00fang, b\u1ea1n s\u1ebd ph\u1ea3i \u0111\u1ed1i m\u1eb7t v\u1edbi c\u00e1c d\u1ef1 \u00e1n b\u1ecb t\u1eeb ch\u1ed1i trong qu\u00e1 tr\u00ecnh ki\u1ec3m tra c\u1ee7a C\u01a1 quan c\u00f3 th\u1ea9m quy\u1ec1n (AHJ), t\u1ed1n k\u00e9m cho vi\u1ec7c l\u00e0m l\u1ea1i v\u00e0\u2014tr\u01b0\u1eddng h\u1ee3p x\u1ea5u nh\u1ea5t\u2014h\u1ecfa ho\u1ea1n thi\u1ebft b\u1ecb khi b\u1ea3o v\u1ec7 qu\u00e1 d\u00f2ng kh\u00f4ng th\u00e0nh c\u00f4ng.<\/p>\n<p>H\u01b0\u1edbng d\u1eabn n\u00e0y l\u00e0m r\u00f5 khi n\u00e0o n\u00ean s\u1eed d\u1ee5ng t\u1eebng thi\u1ebft b\u1ecb, c\u00e1ch nh\u1eadn bi\u1ebft ch\u00fang b\u1eb1ng tr\u1ef1c quan v\u00e0 l\u00fd do t\u1ea1i sao vi\u1ec7c thay th\u1ebf c\u00e1i n\u00e0y cho c\u00e1i kia vi ph\u1ea1m c\u00e1c quy t\u1eafc v\u1ec1 \u0111i\u1ec7n.<\/p>\n<h2>C\u1ea7u dao UL 489 l\u00e0 g\u00ec?<\/h2>\n<p>UL 489 \u0111\u1ecbnh ngh\u0129a ti\u00eau chu\u1ea9n cho \u201c<a href=\"https:\/\/test.viox.com\/vi\/mccb\/\">M\u00e1y c\u1eaft m\u1ea1ch v\u1ecf \u0111\u00fac<\/a>, C\u00f4ng t\u1eafc v\u1ecf \u0111\u00fac v\u00e0 <a href=\"https:\/\/test.viox.com\/vi\/mcb\/\">V\u1ecf c\u1ea7u dao\".<\/a> C\u00e1c thi\u1ebft b\u1ecb n\u00e0y \u0111\u01b0\u1ee3c UL Listed, c\u00f3 ngh\u0129a l\u00e0 ch\u00fang \u0111\u00e3 v\u01b0\u1ee3t qua c\u00e1c th\u1eed nghi\u1ec7m to\u00e0n di\u1ec7n nh\u01b0 c\u00e1c thi\u1ebft b\u1ecb b\u1ea3o v\u1ec7 \u0111\u1ed9c l\u1eadp, ho\u00e0n ch\u1ec9nh, ph\u00f9 h\u1ee3p \u0111\u1ec3 l\u1eafp \u0111\u1eb7t tr\u1ef1c ti\u1ebfp v\u00e0o h\u1ec7 th\u1ed1ng ph\u00e2n ph\u1ed1i \u0111i\u1ec7n.<\/p>\n<p>C\u1ea7u dao UL 489 \u0111\u00f3ng vai tr\u00f2 l\u00e0 <strong>b\u1ea3o v\u1ec7 m\u1ea1ch nh\u00e1nh<\/strong>\u2014thi\u1ebft b\u1ecb b\u1ea3o v\u1ec7 qu\u00e1 d\u00f2ng ch\u00ednh b\u1ea3o v\u1ec7 d\u00e2y d\u1eabn t\u1eeb b\u1ea3ng \u0111i\u1ec1u khi\u1ec3n d\u1ecbch v\u1ee5 \u0111\u1ebfn t\u1ea3i cu\u1ed1i c\u00f9ng. H\u00e3y coi n\u00f3 nh\u01b0 \u201cng\u01b0\u1eddi \u1ee9ng c\u1ee9u \u0111\u1ea7u ti\u00ean\u201d trong h\u1ec7 th\u1ed1ng \u0111i\u1ec7n c\u1ee7a b\u1ea1n. Khi x\u1ea3y ra s\u1ef1 c\u1ed1, c\u1ea7u dao UL 489 ph\u1ea3i \u0111\u1ed9c l\u1eadp ng\u1eaft d\u00f2ng s\u1ef1 c\u1ed1 \u0111\u1ea7y \u0111\u1ee7 (th\u01b0\u1eddng l\u00e0 5 kA, 10 kA ho\u1eb7c cao h\u01a1n t\u00f9y thu\u1ed9c v\u00e0o \u0111\u1ecbnh m\u1ee9c) m\u00e0 kh\u00f4ng c\u1ea7n s\u1ef1 h\u1ed7 tr\u1ee3 t\u1eeb c\u00e1c thi\u1ebft b\u1ecb \u1edf th\u01b0\u1ee3ng ngu\u1ed3n.<\/p>\n<p>C\u00e1c kh\u1ea3 n\u0103ng ch\u00ednh x\u00e1c \u0111\u1ecbnh c\u00e1c thi\u1ebft b\u1ecb UL 489:<\/p>\n<ul>\n<li><strong>Kh\u1ea3 n\u0103ng c\u1eaft d\u00f2ng ng\u1eafn m\u1ea1ch cao<\/strong>: \u0110\u00e3 \u0111\u01b0\u1ee3c ki\u1ec3m tra \u0111\u1ec3 ng\u1eaft c\u00e1c d\u00f2ng ng\u1eafn m\u1ea1ch l\u1edbn m\u1ed9t c\u00e1ch an to\u00e0n, ti\u00eau t\u00e1n n\u0103ng l\u01b0\u1ee3ng h\u1ed3 quang th\u00f4ng qua c\u00e1c r\u00e3nh d\u1eadp h\u1ed3 quang b\u00ean trong ch\u1eafc ch\u1eafn<\/li>\n<li><strong>Ti\u00eau chu\u1ea9n kho\u1ea3ng c\u00e1ch nghi\u00eam ng\u1eb7t<\/strong>: Kho\u1ea3ng h\u1edf v\u00e0 kho\u1ea3ng c\u00e1ch r\u00f2 \u0111i\u1ec7n r\u1ed9ng r\u00e3i gi\u00fap ng\u0103n ng\u1eeba hi\u1ec7n t\u01b0\u1ee3ng ph\u00f3ng \u0111i\u1ec7n b\u1ec1 m\u1eb7t v\u00e0 ph\u00f3ng \u0111i\u1ec7n qu\u00e1 m\u1ee9c trong \u0111i\u1ec1u ki\u1ec7n s\u1ef1 c\u1ed1<\/li>\n<li><strong>Ho\u1ea1t \u0111\u1ed9ng \u0111\u1ed9c l\u1eadp<\/strong>: Kh\u00f4ng y\u00eau c\u1ea7u b\u1ea3o v\u1ec7 \u1edf th\u01b0\u1ee3ng ngu\u1ed3n; c\u1ea7u dao c\u00f3 th\u1ec3 \u0111\u00f3ng vai tr\u00f2 l\u00e0 thi\u1ebft b\u1ecb b\u1ea3o v\u1ec7 duy nh\u1ea5t trong m\u1ea1ch c\u1ee7a n\u00f3<\/li>\n<li><strong>Ph\u00ea duy\u1ec7t \u0111\u1ea5u d\u00e2y t\u1ea1i hi\u1ec7n tr\u01b0\u1eddng<\/strong>: \u0110\u01b0\u1ee3c thi\u1ebft k\u1ebf v\u00e0 th\u1eed nghi\u1ec7m \u0111\u1ec3 b\u1ea3o v\u1ec7 d\u00e2y d\u1eabn r\u1eddi kh\u1ecfi v\u1ecf b\u1ecdc\u2014c\u1ea5p ngu\u1ed3n cho \u1ed5 c\u1eafm, m\u1ea1ch chi\u1ebfu s\u00e1ng, m\u00e1y m\u00f3c v\u00e0 c\u00e1c t\u1ea3i kh\u00e1c<\/li>\n<\/ul>\n<p><strong>\u1ee8ng d\u1ee5ng ph\u1ed5 bi\u1ebfn<\/strong>: B\u1ea3ng ph\u00e2n ph\u1ed1i, ng\u1eaft k\u1ebft n\u1ed1i m\u00e1y m\u00f3c, m\u1ea1ch chi\u1ebfu s\u00e1ng v\u00e0 b\u1ea3o v\u1ec7 \u1ed5 c\u1eafm theo \u0110i\u1ec1u 240 c\u1ee7a NEC.<\/p>\n<h2>B\u1ed9 b\u1ea3o v\u1ec7 b\u1ed5 sung UL 1077 l\u00e0 g\u00ec?<\/h2>\n<p>UL 1077 quy \u0111\u1ecbnh \u201cB\u1ed9 b\u1ea3o v\u1ec7 b\u1ed5 sung \u0111\u1ec3 s\u1eed d\u1ee5ng trong thi\u1ebft b\u1ecb \u0111i\u1ec7n\u201d. T\u1eeb kh\u00f3a l\u00e0 <em>b\u1ed5 sung<\/em>\u2014c\u00e1c thi\u1ebft b\u1ecb n\u00e0y l\u00e0 Th\u00e0nh ph\u1ea7n \u0111\u01b0\u1ee3c UL c\u00f4ng nh\u1eadn, kh\u00f4ng ph\u1ea3i l\u00e0 s\u1ea3n ph\u1ea9m \u0111\u01b0\u1ee3c li\u1ec7t k\u00ea \u0111\u1ed9c l\u1eadp. Ch\u00fang \u0111\u01b0\u1ee3c thi\u1ebft k\u1ebf \u0111\u1ec3 ho\u1ea1t \u0111\u1ed9ng <em>b\u00ean trong<\/em> thi\u1ebft b\u1ecb n\u01a1i \u0111\u00e3 c\u00f3 b\u1ea3o v\u1ec7 m\u1ea1ch nh\u00e1nh (ho\u1eb7c kh\u00f4ng b\u1eaft bu\u1ed9c theo quy \u0111\u1ecbnh).<\/p>\n<p>H\u00e3y coi thi\u1ebft b\u1ecb UL 1077 nh\u01b0 m\u1ed9t \u201cchuy\u00ean gia\u201d\u2014cung c\u1ea5p kh\u1ea3 n\u0103ng b\u1ea3o v\u1ec7 c\u00f3 m\u1ee5c ti\u00eau, chi ti\u1ebft cho c\u00e1c th\u00e0nh ph\u1ea7n nh\u1ea1y c\u1ea3m b\u00ean trong v\u1ecf b\u1ecdc: ngu\u1ed3n \u0111i\u1ec7n PLC, th\u1ee9 c\u1ea5p m\u00e1y bi\u1ebfn \u00e1p, m\u1ea1ch \u0111i\u1ec1u khi\u1ec3n ho\u1eb7c bus \u0111o l\u01b0\u1eddng. N\u00f3 kh\u00f4ng thay th\u1ebf c\u1ea7u dao ch\u00ednh; n\u00f3 \u0111ang th\u00eam m\u1ed9t l\u1edbp b\u1ea3o v\u1ec7 th\u1ee9 hai ph\u00f9 h\u1ee3p v\u1edbi nhu c\u1ea7u c\u1ee7a m\u1ed9t m\u1ea1ch con c\u1ee5 th\u1ec3.<\/p>\n<p>C\u00e1c \u0111\u1eb7c \u0111i\u1ec3m ch\u00ednh x\u00e1c \u0111\u1ecbnh c\u00e1c thi\u1ebft b\u1ecb UL 1077:<\/p>\n<ul>\n<li><strong>Tr\u1ea1ng th\u00e1i th\u00e0nh ph\u1ea7n<\/strong>: \u0110\u01b0\u1ee3c UL c\u00f4ng nh\u1eadn, kh\u00f4ng \u0111\u01b0\u1ee3c Li\u1ec7t k\u00ea; ph\u1ea3i \u0111\u01b0\u1ee3c \u0111\u00e1nh gi\u00e1 trong b\u1ed1i c\u1ea3nh c\u1ee7a s\u1ea3n ph\u1ea9m cu\u1ed1i c\u00f9ng (v\u00ed d\u1ee5: t\u1ee7 \u0111i\u1ec1u khi\u1ec3n \u0111\u01b0\u1ee3c ch\u1ee9ng nh\u1eadn theo UL 508A)<\/li>\n<li><strong>Kh\u1ea3 n\u0103ng c\u1eaft th\u1ea5p h\u01a1n<\/strong>: \u0110\u1ee7 cho c\u00e1c s\u1ef1 c\u1ed1 b\u00ean trong thi\u1ebft b\u1ecb, nh\u01b0ng kh\u00f4ng \u0111\u01b0\u1ee3c ki\u1ec3m tra \u1edf c\u00f9ng m\u1ee9c d\u00f2ng s\u1ef1 c\u1ed1 nh\u01b0 c\u1ea7u dao UL 489<\/li>\n<li><strong>Gi\u1ea3m y\u00eau c\u1ea7u v\u1ec1 kho\u1ea3ng c\u00e1ch<\/strong>: Kho\u1ea3ng h\u1edf v\u00e0 kho\u1ea3ng c\u00e1ch r\u00f2 \u0111i\u1ec7n \u0111\u00e1p \u1ee9ng c\u00e1c ti\u00eau chu\u1ea9n UL 1077 v\u00e0 UL 840 nh\u01b0ng \u00edt nghi\u00eam ng\u1eb7t h\u01a1n UL 489<\/li>\n<li><strong>S\u1ef1 ph\u1ee5 thu\u1ed9c v\u00e0o b\u1ea3o v\u1ec7 \u1edf th\u01b0\u1ee3ng ngu\u1ed3n<\/strong>: Gi\u1ea3 \u0111\u1ecbnh c\u1ea7u dao UL 489 \u1edf th\u01b0\u1ee3ng ngu\u1ed3n s\u1ebd gi\u1edbi h\u1ea1n n\u0103ng l\u01b0\u1ee3ng s\u1ef1 c\u1ed1 tr\u01b0\u1edbc khi b\u1ed9 b\u1ea3o v\u1ec7 b\u1ed5 sung nh\u00ecn th\u1ea5y m\u1ee9c d\u00f2ng \u0111i\u1ec7n ph\u00e1 h\u1ee7y<\/li>\n<li><strong>Ch\u1ec9 \u0111\u1ea5u d\u00e2y b\u00ean trong<\/strong>: B\u1ecb h\u1ea1n ch\u1ebf r\u00f5 r\u00e0ng \u0111\u1ec3 b\u1ea3o v\u1ec7 d\u00e2y d\u1eabn <em>b\u00ean trong<\/em> v\u1ecf b\u1ecdc thi\u1ebft b\u1ecb; kh\u00f4ng \u0111\u01b0\u1ee3c ph\u00ea duy\u1ec7t cho \u0111\u1ea5u d\u00e2y t\u1ea1i hi\u1ec7n tr\u01b0\u1eddng, \u1ed5 c\u1eafm ho\u1eb7c t\u1ea3i b\u00ean ngo\u00e0i t\u1ee7<\/li>\n<\/ul>\n<p><strong>\u1ee8ng d\u1ee5ng ph\u1ed5 bi\u1ebfn<\/strong>: M\u1ea1ch b\u00ean trong trong t\u1ee7 \u0111i\u1ec1u khi\u1ec3n, b\u1ed9 \u0111i\u1ec1u khi\u1ec3n m\u00e1y m\u00f3c v\u00e0 thi\u1ebft b\u1ecb \u0111o l\u01b0\u1eddng\u2014lu\u00f4n c\u00f3 b\u1ea3o v\u1ec7 UL 489 \u1edf th\u01b0\u1ee3ng ngu\u1ed3n.<\/p>\n<figure style=\"text-align: center; margin: 20px 0;\"><img decoding=\"async\" style=\"max-width: 100%; height: auto;\" src=\"https:\/\/img.viox.com\/viox-circuit-breakers-mounted-on-din-rail-in-industrial-control-panel-with-organized-wiring-and-professional-installation.webp\" alt=\"VIOX circuit breakers mounted on DIN rail in industrial control panel with organized wiring and professional installation\" \/><figcaption style=\"color: #666; font-size: 0.9em; margin-top: 8px;\">C\u1ea7u dao VIOX \u0111\u01b0\u1ee3c g\u1eafn tr\u00ean <a href=\"https:\/\/test.viox.com\/vi\/din-rail\/\">DIN<\/a> trong t\u1ee7 \u0111i\u1ec1u khi\u1ec3n c\u00f4ng nghi\u1ec7p, th\u1ec3 hi\u1ec7n h\u1ec7 th\u1ed1ng d\u00e2y \u0111i\u1ec7n v\u00e0 l\u1eafp \u0111\u1eb7t chuy\u00ean nghi\u1ec7p.<\/figcaption><\/figure>\n<h2>So s\u00e1nh song song: UL 489 so v\u1edbi UL 1077<\/h2>\n<table style=\"border-collapse: collapse; width: 100%; margin-bottom: 20px;\" border=\"1\" cellspacing=\"0\" cellpadding=\"8\">\n<thead>\n<tr style=\"background-color: #f5f5f5;\">\n<th>Thu\u1ed9c t\u00ednh<\/th>\n<th>C\u1ea7u dao UL 489<\/th>\n<th>B\u1ed9 b\u1ea3o v\u1ec7 b\u1ed5 sung UL 1077<\/th>\n<\/tr>\n<\/thead>\n<tbody>\n<tr>\n<td><strong>Tr\u1ea1ng th\u00e1i ch\u1ee9ng nh\u1eadn<\/strong><\/td>\n<td>UL Listed (s\u1ea3n ph\u1ea9m ho\u00e0n ch\u1ec9nh)<\/td>\n<td>Th\u00e0nh ph\u1ea7n \u0111\u01b0\u1ee3c UL c\u00f4ng nh\u1eadn (ph\u1ea3i \u0111\u01b0\u1ee3c s\u1eed d\u1ee5ng trong thi\u1ebft b\u1ecb \u0111\u01b0\u1ee3c li\u1ec7t k\u00ea)<\/td>\n<\/tr>\n<tr>\n<td><strong>Ch\u1ee9c n\u0103ng ch\u00ednh<\/strong><\/td>\n<td>B\u1ea3o v\u1ec7 qu\u00e1 d\u00f2ng m\u1ea1ch nh\u00e1nh<\/td>\n<td>B\u1ea3o v\u1ec7 b\u1ed5 sung b\u00ean trong thi\u1ebft b\u1ecb<\/td>\n<\/tr>\n<tr>\n<td><strong>Kh\u1ea3 n\u0103ng ng\u1eaft<\/strong><\/td>\n<td>Cao (th\u01b0\u1eddng l\u00e0 5-25 kA, \u0111\u01b0\u1ee3c ki\u1ec3m tra theo \u0111\u1ecbnh m\u1ee9c \u0111\u1ea7y \u0111\u1ee7)<\/td>\n<td>Th\u1ea5p h\u01a1n (\u0111\u1ee7 cho c\u00e1c s\u1ef1 c\u1ed1 b\u00ean trong, th\u1eed nghi\u1ec7m h\u1ea1n ch\u1ebf)<\/td>\n<\/tr>\n<tr>\n<td><strong>Kho\u1ea3ng h\u1edf \u0111i\u1ec7n<\/strong><\/td>\n<td>Nghi\u00eam ng\u1eb7t (\u0111\u01b0\u1ee3c thi\u1ebft k\u1ebf \u0111\u1ec3 ng\u1eaft s\u1ef1 c\u1ed1 \u0111\u1ed9c l\u1eadp)<\/td>\n<td>Gi\u1ea3m (gi\u1ea3 \u0111\u1ecbnh b\u1ea3o v\u1ec7 \u1edf th\u01b0\u1ee3ng ngu\u1ed3n gi\u1edbi h\u1ea1n n\u0103ng l\u01b0\u1ee3ng s\u1ef1 c\u1ed1)<\/td>\n<\/tr>\n<tr>\n<td><strong>V\u1ecb tr\u00ed l\u1eafp \u0111\u1eb7t<\/strong><\/td>\n<td>B\u1ea3ng \u0111i\u1ec1u khi\u1ec3n d\u1ecbch v\u1ee5, b\u1ea3ng ph\u00e2n ph\u1ed1i, ng\u1eaft k\u1ebft n\u1ed1i m\u00e1y m\u00f3c<\/td>\n<td>B\u00ean trong t\u1ee7 \u0111i\u1ec1u khi\u1ec3n, v\u1ecf b\u1ecdc thi\u1ebft b\u1ecb, thi\u1ebft b\u1ecb<\/td>\n<\/tr>\n<tr>\n<td><strong>B\u1ea3o v\u1ec7 \u0111\u1ea5u d\u00e2y t\u1ea1i hi\u1ec7n tr\u01b0\u1eddng<\/strong><\/td>\n<td><strong>Yes<\/strong> \u2013 \u0111\u01b0\u1ee3c ph\u00ea duy\u1ec7t cho d\u00e2y d\u1eabn r\u1eddi kh\u1ecfi v\u1ecf b\u1ecdc<\/td>\n<td><strong>Kh\u00f4ng c\u00f3<\/strong> \u2013 ch\u1ec9 \u0111\u1ea5u d\u00e2y b\u00ean trong<\/td>\n<\/tr>\n<tr>\n<td><strong>B\u1ea3o v\u1ec7 \u1ed5 c\u1eafm<\/strong><\/td>\n<td><strong>Yes<\/strong> \u2013 c\u00f3 th\u1ec3 b\u1ea3o v\u1ec7 tr\u1ef1c ti\u1ebfp c\u00e1c \u1ed5 c\u1eafm v\u00e0 \u1ed5 c\u1eafm<\/td>\n<td><strong>Kh\u00f4ng c\u00f3<\/strong> \u2013 vi ph\u1ea1m NEC n\u1ebfu \u0111\u01b0\u1ee3c s\u1eed d\u1ee5ng cho m\u1ea1ch \u1ed5 c\u1eafm<\/td>\n<\/tr>\n<tr>\n<td><strong>Y\u00eau c\u1ea7u b\u1ea3o v\u1ec7 \u1edf th\u01b0\u1ee3ng ngu\u1ed3n<\/strong><\/td>\n<td>Kh\u00f4ng \u2013 ho\u1ea1t \u0111\u1ed9ng \u0111\u1ed9c l\u1eadp<\/td>\n<td>C\u00f3 \u2013 y\u00eau c\u1ea7u c\u1ea7u dao UL 489 \u1edf th\u01b0\u1ee3ng ngu\u1ed3n (ho\u1eb7c kh\u00f4ng y\u00eau c\u1ea7u b\u1ea3o v\u1ec7 theo quy \u0111\u1ecbnh)<\/td>\n<\/tr>\n<tr>\n<td><strong>Tham chi\u1ebfu \u0110i\u1ec1u kho\u1ea3n NEC<\/strong><\/td>\n<td>\u0110i\u1ec1u kho\u1ea3n 240 NEC (b\u1ea3o v\u1ec7 m\u1ea1ch nh\u00e1nh)<\/td>\n<td>\u0110i\u1ec1u kho\u1ea3n 240.10 NEC (b\u1ea3o v\u1ec7 qu\u00e1 d\u00f2ng b\u1ed5 sung)<\/td>\n<\/tr>\n<tr>\n<td><strong>Nh\u1eadn d\u1ea1ng b\u1eb1ng m\u1eaft<\/strong><\/td>\n<td>D\u1ea5u UL Listed (v\u00f2ng tr\u00f2n c\u00f3 ch\u1eef \u201cUL\u201d v\u00e0 \u00ae)<\/td>\n<td>D\u1ea5u UL Recognized (\u201cUR\u201d, th\u01b0\u1eddng ng\u01b0\u1ee3c)<\/td>\n<\/tr>\n<tr>\n<td><strong>Ph\u1ea1m vi gi\u00e1 \u0111i\u1ec3n h\u00ecnh<\/strong><\/td>\n<td>$30-$80+ (t\u00f9y thu\u1ed9c v\u00e0o \u0111\u1ecbnh m\u1ee9c v\u00e0 t\u00ednh n\u0103ng)<\/td>\n<td>$10-$25 (th\u1ea5p h\u01a1n do ph\u1ea1m vi th\u1eed nghi\u1ec7m gi\u1ea3m)<\/td>\n<\/tr>\n<tr>\n<td><strong>V\u00ed d\u1ee5 v\u1ec1 tr\u01b0\u1eddng h\u1ee3p s\u1eed d\u1ee5ng<\/strong><\/td>\n<td>B\u1ed9 ng\u1eaft m\u1ea1ch ch\u00ednh b\u1ea3o v\u1ec7 m\u1ea1ch \u1ed5 c\u1eafm 20A trong x\u01b0\u1edfng<\/td>\n<td>B\u1ed9 b\u1ea3o v\u1ec7 2A b\u1ea3o v\u1ec7 ngu\u1ed3n \u0111i\u1ec7n PLC b\u00ean trong t\u1ee7 \u0111i\u1ec1u khi\u1ec3n<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<h2>C\u00e1c t\u00ecnh hu\u1ed1ng \u1ee9ng d\u1ee5ng: M\u1ed7i thi\u1ebft b\u1ecb thu\u1ed9c v\u1ec1 \u0111\u00e2u<\/h2>\n<p>Hi\u1ec3u bi\u1ebft <em>v\u1ecb tr\u00ed<\/em> \u0111\u1ec3 tri\u1ec3n khai t\u1eebng lo\u1ea1i thi\u1ebft b\u1ecb l\u00e0 \u0111i\u1ec1u c\u1ea7n thi\u1ebft \u0111\u1ec3 tu\u00e2n th\u1ee7 quy t\u1eafc. C\u00e1c vi ph\u1ea1m ph\u1ed5 bi\u1ebfn nh\u1ea5t x\u1ea3y ra khi c\u00e1c nh\u00e0 s\u1ea3n xu\u1ea5t b\u1ea3ng \u0111i\u1ec1u khi\u1ec3n ho\u1eb7c OEM s\u1eed d\u1ee5ng b\u1ed9 b\u1ea3o v\u1ec7 b\u1ed5 sung UL 1077 trong c\u00e1c \u1ee9ng d\u1ee5ng y\u00eau c\u1ea7u b\u1ed9 ng\u1eaft m\u1ea1ch UL 489. D\u01b0\u1edbi \u0111\u00e2y l\u00e0 khung quy\u1ebft \u0111\u1ecbnh d\u1ef1a tr\u00ean lo\u1ea1i d\u00e2y v\u00e0 v\u1ecb tr\u00ed t\u1ea3i.<\/p>\n<h3>T\u00ecnh hu\u1ed1ng 1: B\u1ea3o v\u1ec7 \u1ed5 c\u1eafm<\/h3>\n<p><strong>Y\u00eau c\u1ea7u<\/strong>: B\u1ed9 ng\u1eaft m\u1ea1ch UL 489<\/p>\n<p><strong>T\u1ea1i sao<\/strong>: B\u1ea5t k\u1ef3 \u1ed5 c\u1eafm n\u00e0o c\u0169ng \u0111\u01b0\u1ee3c coi l\u00e0 t\u1ea3i m\u1ea1ch nh\u00e1nh theo NEC, y\u00eau c\u1ea7u b\u1ea3o v\u1ec7 qu\u00e1 d\u00f2ng m\u1ea1ch nh\u00e1nh.<\/p>\n<p><strong>Ph\u01b0\u01a1ng ph\u00e1p ti\u1ebfp c\u1eadn \u0111\u00fang<\/strong>: S\u1eed d\u1ee5ng b\u1ed9 ng\u1eaft m\u1ea1ch UL 489 (th\u01b0\u1eddng l\u00e0 15A ho\u1eb7c 20A) \u0111\u1ec3 b\u1ea3o v\u1ec7 m\u1ea1ch \u1ed5 c\u1eafm.<\/p>\n<h3>T\u00ecnh hu\u1ed1ng 2: D\u00e2y hi\u1ec7n tr\u01b0\u1eddng \u0111\u1ebfn t\u1ea3i b\u00ean ngo\u00e0i<\/h3>\n<p><strong>Y\u00eau c\u1ea7u<\/strong>: B\u1ed9 ng\u1eaft m\u1ea1ch UL 489<\/p>\n<p><strong>T\u1ea1i sao<\/strong>: \u201cD\u00e2y hi\u1ec7n tr\u01b0\u1eddng\u201d (d\u00e2y d\u1eabn r\u1eddi kh\u1ecfi v\u1ecf \u0111\u1ec3 c\u1ea5p ngu\u1ed3n cho t\u1ea3i b\u00ean ngo\u00e0i) ph\u1ea3i \u0111\u01b0\u1ee3c b\u1ea3o v\u1ec7 b\u1edfi c\u00e1c thi\u1ebft b\u1ecb m\u1ea1ch nh\u00e1nh \u0111\u01b0\u1ee3c li\u1ec7t k\u00ea theo NEC.<\/p>\n<p><strong>Ph\u01b0\u01a1ng ph\u00e1p ti\u1ebfp c\u1eadn \u0111\u00fang<\/strong>: L\u1eafp \u0111\u1eb7t b\u1ed9 ng\u1eaft m\u1ea1ch UL 489 \u0111\u01b0\u1ee3c \u0111\u1ecbnh m\u1ee9c cho k\u00edch th\u01b0\u1edbc d\u00e2y d\u1eabn v\u00e0 t\u1ea3i.<\/p>\n<h3>T\u00ecnh hu\u1ed1ng 3: M\u1ea1ch \u0111i\u1ec1u khi\u1ec3n v\u00e0 linh ki\u1ec7n b\u00ean trong<\/h3>\n<p><strong>Y\u00eau c\u1ea7u<\/strong>: B\u1ed9 b\u1ea3o v\u1ec7 b\u1ed5 sung UL 1077 (v\u1edbi b\u1ed9 ng\u1eaft m\u1ea1ch UL 489 \u1edf ph\u00eda tr\u00ean)<\/p>\n<p><strong>T\u1ea1i sao<\/strong>: B\u00ean trong t\u1ee7 \u0111i\u1ec1u khi\u1ec3n, h\u00e0ng t\u00e1 t\u1ea3i nh\u1ecf m\u1ed7i t\u1ea3i c\u1ea7n \u0111\u01b0\u1ee3c b\u1ea3o v\u1ec7. C\u00e1c thi\u1ebft b\u1ecb UL 1077 cung c\u1ea5p kh\u1ea3 n\u0103ng b\u1ea3o v\u1ec7 chi ti\u1ebft trong khi b\u1ed9 ng\u1eaft m\u1ea1ch UL 489 ch\u00ednh b\u1ea3o v\u1ec7 \u0111\u01b0\u1eddng d\u00e2y c\u1ea5p ngu\u1ed3n \u0111\u1ebfn.<\/p>\n<p><strong>V\u00ed d\u1ee5 tu\u00e2n th\u1ee7<\/strong>: M\u1ed9t b\u1ea3ng \u0111i\u1ec1u khi\u1ec3n \u0111\u01b0\u1ee3c li\u1ec7t k\u00ea theo UL 508A c\u00f3 b\u1ed9 ng\u1eaft m\u1ea1ch UL 489 20A c\u1ea5p ngu\u1ed3n cho b\u1ea3ng \u0111i\u1ec1u khi\u1ec3n. B\u00ean trong, c\u00e1c m\u1ea1ch s\u1eed d\u1ee5ng b\u1ed9 b\u1ea3o v\u1ec7 UL 1077 2A cho PLC, 5A cho HMI v\u00e0 1A cho r\u01a1le an to\u00e0n.<\/p>\n<p><strong>Quy t\u1eafc ch\u00ednh<\/strong>: C\u00e1c thi\u1ebft b\u1ecb UL 1077 b\u1ea3o v\u1ec7 <em>d\u00e2y b\u00ean trong<\/em> ch\u1ec9. N\u1ebfu b\u1ea5t k\u1ef3 d\u00e2y d\u1eabn n\u00e0o tho\u00e1t ra kh\u1ecfi b\u1ea3ng \u0111i\u1ec1u khi\u1ec3n, h\u00e3y s\u1eed d\u1ee5ng UL 489.<\/p>\n<h3>T\u00ecnh hu\u1ed1ng 4: M\u1ea1ch chi\u1ebfu s\u00e1ng<\/h3>\n<p><strong>Y\u00eau c\u1ea7u<\/strong>: Th\u00f4ng th\u01b0\u1eddng l\u00e0 b\u1ed9 ng\u1eaft m\u1ea1ch UL 489<\/p>\n<p><strong>T\u1ea1i sao<\/strong>: M\u1ea1ch chi\u1ebfu s\u00e1ng l\u00e0 m\u1ea1ch nh\u00e1nh theo \u0111\u1ecbnh ngh\u0129a, y\u00eau c\u1ea7u b\u1ea3o v\u1ec7 m\u1ea1ch nh\u00e1nh theo NEC.<\/p>\n<p><strong>V\u00ed d\u1ee5<\/strong>: \u0110\u00e8n b\u1ea3ng \u0111i\u1ec1u khi\u1ec3n b\u00ean trong v\u1ecf c\u00f3 th\u1ec3 s\u1eed d\u1ee5ng UL 1077 <em>n\u1ebfu<\/em> ch\u00fang l\u00e0 m\u1ed9t ph\u1ea7n c\u1ee7a h\u1ec7 th\u1ed1ng d\u00e2y \u0111i\u1ec7n b\u00ean trong. \u0110\u00e8n chi\u1ebfu s\u00e1ng b\u00ean ngo\u00e0i ph\u1ea3i c\u00f3 b\u1ea3o v\u1ec7 UL 489.<\/p>\n<h3>B\u1ea3ng quy\u1ebft \u0111\u1ecbnh nhanh: T\u00f4i c\u1ea7n thi\u1ebft b\u1ecb n\u00e0o?<\/h3>\n<table style=\"border-collapse: collapse; width: 100%; margin-bottom: 20px;\" border=\"1\" cellspacing=\"0\" cellpadding=\"8\">\n<thead>\n<tr style=\"background-color: #f5f5f5;\">\n<th>\u1ee8ng d\u1ee5ng<\/th>\n<th>Thi\u1ebft b\u1ecb y\u00eau c\u1ea7u<\/th>\n<th>L\u00fd do<\/th>\n<\/tr>\n<\/thead>\n<tbody>\n<tr>\n<td>\u1ed4 c\u1eafm (b\u1ea5t k\u1ef3 v\u1ecb tr\u00ed n\u00e0o)<\/td>\n<td>UL 489<\/td>\n<td>NEC y\u00eau c\u1ea7u b\u1ea3o v\u1ec7 m\u1ea1ch nh\u00e1nh cho t\u1ea5t c\u1ea3 c\u00e1c \u1ed5 c\u1eafm<\/td>\n<\/tr>\n<tr>\n<td>D\u00e2y hi\u1ec7n tr\u01b0\u1eddng \u0111\u1ebfn t\u1ea3i b\u00ean ngo\u00e0i<\/td>\n<td>UL 489<\/td>\n<td>D\u00e2y d\u1eabn r\u1eddi kh\u1ecfi v\u1ecf l\u00e0 m\u1ea1ch nh\u00e1nh<\/td>\n<\/tr>\n<tr>\n<td>D\u00e2y b\u00ean trong b\u1ea3ng \u0111i\u1ec1u khi\u1ec3n (PLC, r\u01a1le)<\/td>\n<td>Ti\u00eau chu\u1ea9n UL1077<\/td>\n<td>B\u1ea3o v\u1ec7 b\u1ed5 sung; UL 489 ph\u00eda tr\u00ean \u0111\u00e3 c\u00f3<\/td>\n<\/tr>\n<tr>\n<td>M\u1ea1ch chi\u1ebfu s\u00e1ng (t\u00f2a nh\u00e0\/chung)<\/td>\n<td>UL 489<\/td>\n<td>C\u00e1c y\u00eau c\u1ea7u v\u1ec1 m\u1ea1ch nh\u00e1nh \u0111\u01b0\u1ee3c \u00e1p d\u1ee5ng<\/td>\n<\/tr>\n<tr>\n<td>\u0110\u00e8n b\u00ean trong b\u1ea3ng \u0111i\u1ec1u khi\u1ec3n<\/td>\n<td>Ti\u00eau chu\u1ea9n UL1077<\/td>\n<td>N\u1ebfu l\u00e0 m\u1ed9t ph\u1ea7n c\u1ee7a h\u1ec7 th\u1ed1ng d\u00e2y \u0111i\u1ec7n b\u00ean trong thi\u1ebft b\u1ecb; ki\u1ec3m tra c\u00e1c quy t\u1eafc UL 508A<\/td>\n<\/tr>\n<tr>\n<td>S\u01a1 c\u1ea5p m\u00e1y bi\u1ebfn \u00e1p (b\u00ean ngo\u00e0i)<\/td>\n<td>UL 489<\/td>\n<td>S\u01a1 c\u1ea5p l\u00e0 t\u1ea3i m\u1ea1ch nh\u00e1nh<\/td>\n<\/tr>\n<tr>\n<td>Th\u1ee9 c\u1ea5p m\u00e1y bi\u1ebfn \u00e1p (b\u00ean trong)<\/td>\n<td>Ti\u00eau chu\u1ea9n UL1077<\/td>\n<td>M\u1ea1ch th\u1ee9 c\u1ea5p b\u00ean trong thi\u1ebft b\u1ecb c\u00f3 th\u1ec3 s\u1eed d\u1ee5ng b\u1ed5 sung<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<figure style=\"text-align: center; margin: 20px 0;\"><img decoding=\"async\" style=\"max-width: 100%; height: auto;\" src=\"https:\/\/img.viox.com\/electrical-schematic-diagram-showing-proper-placement-of-ul-489-branch-circuit-breakers-and-ul-1077-supplementary-protectors-in-industrial-control-panel-layout-with-viox-logo.webp\" alt=\"Electrical schematic diagram showing proper placement of UL 489 branch circuit breakers and UL 1077 supplementary protectors in industrial control panel layout with VIOX logo\" \/><figcaption style=\"color: #666; font-size: 0.9em; margin-top: 8px;\">S\u01a1 \u0111\u1ed3 \u0111i\u1ec7n minh h\u1ecda v\u1ecb tr\u00ed th\u00edch h\u1ee3p c\u1ee7a b\u1ed9 ng\u1eaft m\u1ea1ch nh\u00e1nh UL 489 so v\u1edbi b\u1ed9 b\u1ea3o v\u1ec7 b\u1ed5 sung UL 1077 trong b\u1ed1 c\u1ee5c b\u1ea3ng \u0111i\u1ec1u khi\u1ec3n c\u00f4ng nghi\u1ec7p.<\/figcaption><\/figure>\n<h2>Nh\u1eadn d\u1ea1ng b\u1eb1ng m\u1eaft: C\u00e1ch ph\u00e2n bi\u1ec7t ch\u00fang<\/h2>\n<p>V\u00ec c\u00e1c thi\u1ebft b\u1ecb UL 489 v\u00e0 UL 1077 th\u01b0\u1eddng c\u00f3 chung c\u00e1c y\u1ebfu t\u1ed1 h\u00ecnh th\u1ee9c gi\u1ed1ng h\u1ec7t nhau\u2014\u0111\u1eb7c bi\u1ec7t l\u00e0 \u1edf \u0111\u1ecbnh d\u1ea1ng b\u1ed9 ng\u1eaft m\u1ea1ch thu nh\u1ecf DIN rail\u2014vi\u1ec7c bi\u1ebft c\u00e1ch x\u00e1c \u0111\u1ecbnh ch\u00fang b\u1eb1ng m\u1eaft th\u01b0\u1eddng l\u00e0 r\u1ea5t quan tr\u1ecdng \u0111\u1ed1i v\u1edbi vi\u1ec7c ki\u1ec3m tra hi\u1ec7n tr\u01b0\u1eddng, qu\u1ea3n l\u00fd h\u00e0ng t\u1ed3n kho v\u00e0 x\u00e1c minh tu\u00e2n th\u1ee7.<\/p>\n<h3>T\u00ecm ki\u1ebfm D\u1ea5u ch\u1ee9ng nh\u1eadn<\/h3>\n<p>M\u00e3 \u0111\u1ecbnh danh \u0111\u00e1ng tin c\u1eady nh\u1ea5t l\u00e0 d\u1ea5u ch\u1ee9ng nh\u1eadn UL \u0111\u01b0\u1ee3c in ho\u1eb7c \u0111\u00fac tr\u00ean th\u00e2n ho\u1eb7c nh\u00e3n thi\u1ebft b\u1ecb:<\/p>\n<p><strong>B\u1ed9 ng\u1eaft m\u1ea1ch UL 489<\/strong> hi\u1ec3n th\u1ecb <strong>D\u1ea5u UL Listed<\/strong>: m\u1ed9t v\u00f2ng tr\u00f2n c\u00f3 ch\u1eef \u201cUL\u201d v\u00e0 \u00ae. \u0110i\u1ec1u n\u00e0y cho bi\u1ebft m\u1ed9t s\u1ea3n ph\u1ea9m ho\u00e0n ch\u1ec9nh \u0111\u01b0\u1ee3c ch\u1ea5p thu\u1eadn \u0111\u1ec3 l\u1eafp \u0111\u1eb7t tr\u1ef1c ti\u1ebfp trong h\u1ec7 th\u1ed1ng \u0111i\u1ec7n.<\/p>\n<p><strong>B\u1ed9 b\u1ea3o v\u1ec7 b\u1ed5 sung UL 1077<\/strong> mang <strong>D\u1ea5u UL Recognized Component<\/strong>: K\u00fd hi\u1ec7u \u201cUR\u201d ho\u1eb7c \u201cUL Recognized Component\u201d, cho bi\u1ebft tr\u1ea1ng th\u00e1i ch\u1ec9 d\u00e0nh cho th\u00e0nh ph\u1ea7n.<\/p>\n<h3>Ki\u1ec3m tra Nh\u00e3n thi\u1ebft b\u1ecb v\u00e0 S\u1ed1 ki\u1ec3u m\u00e1y<\/h3>\n<p>C\u00e1c nh\u00e0 s\u1ea3n xu\u1ea5t th\u01b0\u1eddng m\u00e3 h\u00f3a lo\u1ea1i ch\u1ee9ng nh\u1eadn trong nh\u00e3n s\u1ea3n ph\u1ea9m:<\/p>\n<ul>\n<li><strong>Ti\u1ec1n t\u1ed1 ho\u1eb7c h\u1eadu t\u1ed1 c\u1ee7a s\u1ed1 model<\/strong>: M\u1ed9t s\u1ed1 th\u01b0\u01a1ng hi\u1ec7u s\u1eed d\u1ee5ng t\u00ean series ri\u00eang bi\u1ec7t\u2014v\u00ed d\u1ee5: \u201cCB-\u201d cho b\u1ed9 ng\u1eaft m\u1ea1ch (UL 489) v\u00e0 \u201cSP-\u201d cho b\u1ed9 b\u1ea3o v\u1ec7 b\u1ed5 sung (UL 1077).<\/li>\n<li><strong>V\u0103n b\u1ea3n tr\u00ean nh\u00e3n<\/strong>: T\u00ecm c\u00e1c tuy\u00ean b\u1ed1 r\u00f5 r\u00e0ng nh\u01b0 \u201cBranch Circuit Protector\u201d (UL 489) ho\u1eb7c \u201cSupplementary Protector for Use in Electrical Equipment\u201d (UL 1077).<\/li>\n<li><strong>Tham chi\u1ebfu ti\u00eau chu\u1ea9n<\/strong>: Nh\u00e3n thi\u1ebft b\u1ecb c\u00f3 th\u1ec3 tr\u00edch d\u1eabn tr\u1ef1c ti\u1ebfp \u201cUL 489\u201d ho\u1eb7c \u201cUL 1077\u201d.<\/li>\n<\/ul>\n<h3>Ki\u1ec3m tra B\u1ea3ng d\u1eef li\u1ec7u ho\u1eb7c Catalog<\/h3>\n<p>Khi \u0111\u1eb7t h\u00e0ng ho\u1eb7c ch\u1ec9 \u0111\u1ecbnh thi\u1ebft b\u1ecb, h\u00e3y tham kh\u1ea3o t\u00e0i li\u1ec7u k\u1ef9 thu\u1eadt c\u1ee7a nh\u00e0 s\u1ea3n xu\u1ea5t:<\/p>\n<ul>\n<li><strong>Danh s\u00e1ch ch\u1ee9ng nh\u1eadn<\/strong>: C\u00e1c nh\u00e0 s\u1ea3n xu\u1ea5t uy t\u00edn n\u00eau r\u00f5 li\u1ec7u s\u1ea3n ph\u1ea9m c\u00f3 \u0111\u01b0\u1ee3c UL Listed (489) hay UL Recognized (1077).<\/li>\n<li><strong>\u0110\u00e1nh gi\u00e1 \u0111i\u1ec7n<\/strong>: Thi\u1ebft b\u1ecb UL 1077 c\u00f3 d\u00f2ng c\u1eaft th\u1ea5p h\u01a1n (3-5 kA) so v\u1edbi UL 489 (10-25 kA).<\/li>\n<\/ul>\n<p>Nhi\u1ec1u nh\u00e0 s\u1ea3n xu\u1ea5t s\u1eed d\u1ee5ng c\u00f9ng m\u1ed9t v\u1ecf cho c\u1ea3 hai lo\u1ea1i. Lu\u00f4n x\u00e1c minh d\u1ea5u ch\u1ee9ng nh\u1eadn\u2014kh\u00f4ng bao gi\u1edd ch\u1ec9 d\u1ef1a v\u00e0o h\u00ecnh th\u1ee9c b\u00ean ngo\u00e0i.<\/p>\n<h3>Danh s\u00e1ch ki\u1ec3m tra nh\u1eadn d\u1ea1ng tr\u1ef1c quan nhanh<\/h3>\n<figure style=\"text-align: center; margin: 20px 0;\"><img decoding=\"async\" style=\"max-width: 100%; height: auto;\" src=\"https:\/\/img.viox.com\/visual-identification-guide-showing-ul-listed-certification-mark-circular-ul-with-registered-trademark-for-ul-489-breakers-and-ur-recognized-component-mark-for-ul-1077-protectors-on-viox-devices.webp\" alt=\"Visual identification guide showing UL Listed certification mark for UL 489 breakers and UR Recognized Component mark for UL 1077 protectors on VIOX devices\" \/><figcaption style=\"color: #666; font-size: 0.9em; margin-top: 8px;\">H\u01b0\u1edbng d\u1eabn nh\u1eadn d\u1ea1ng tr\u1ef1c quan: ph\u00e2n bi\u1ec7t gi\u1eefa d\u1ea5u ch\u1ee9ng nh\u1eadn UL Listed (UL 489) v\u00e0 d\u1ea5u UR Recognized Component (UL 1077) tr\u00ean c\u00e1c thi\u1ebft b\u1ecb VIOX.<\/figcaption><\/figure>\n<table style=\"border-collapse: collapse; width: 100%; margin-bottom: 20px;\" border=\"1\" cellspacing=\"0\" cellpadding=\"8\">\n<thead>\n<tr style=\"background-color: #f5f5f5;\">\n<th>Ki\u1ec3m tra c\u00e1i n\u00e0y<\/th>\n<th>Ch\u1ec9 b\u00e1o UL 489<\/th>\n<th>Ch\u1ec9 b\u00e1o UL 1077<\/th>\n<\/tr>\n<\/thead>\n<tbody>\n<tr>\n<td><strong>D\u1ea5u ch\u1ee9ng nh\u1eadn<\/strong><\/td>\n<td>V\u00f2ng tr\u00f2n c\u00f3 \u201cUL\u201d v\u00e0 \u00ae<\/td>\n<td>\u201cBi\u1ec3u t\u01b0\u1ee3ng \u201dUR\u201c ho\u1eb7c \u201dUL Recognized Component\u201d<\/td>\n<\/tr>\n<tr>\n<td><strong>N\u1ed9i dung nh\u00e3n<\/strong><\/td>\n<td>\u201cListed,\u201d \u201cCircuit Breaker\u201d (\u0110\u01b0\u1ee3c li\u1ec7t k\u00ea, B\u1ed9 ng\u1eaft m\u1ea1ch)\u201d<\/td>\n<td>\u201cRecognized,\u201d \u201cSupplementary Protector\u201d (\u0110\u01b0\u1ee3c c\u00f4ng nh\u1eadn, B\u1ed9 b\u1ea3o v\u1ec7 b\u1ed5 sung)\u201d<\/td>\n<\/tr>\n<tr>\n<td><strong>B\u1ea3ng d\u1eef li\u1ec7u<\/strong><\/td>\n<td>Li\u1ec7t k\u00ea l\u00e0 UL 489, hi\u1ec3n th\u1ecb Icu\/Ics cao<\/td>\n<td>Li\u1ec7t k\u00ea l\u00e0 UL 1077, l\u01b0u \u00fd s\u1eed d\u1ee5ng th\u00e0nh ph\u1ea7n<\/td>\n<\/tr>\n<tr>\n<td><strong>M\u00f4 t\u1ea3 \u1ee9ng d\u1ee5ng<\/strong><\/td>\n<td>M\u1ea1ch nh\u00e1nh, \u0111\u01b0\u1ee3c ph\u00ea duy\u1ec7t cho \u0111\u1ea5u d\u00e2y t\u1ea1i hi\u1ec7n tr\u01b0\u1eddng<\/td>\n<td>Ch\u1ec9 s\u1eed d\u1ee5ng cho thi\u1ebft b\u1ecb b\u00ean trong<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<h2>C\u1ea3nh b\u00e1o tu\u00e2n th\u1ee7 v\u00e0 c\u00e1c bi\u1ec7n ph\u00e1p t\u1ed1t nh\u1ea5t<\/h2>\n<p>S\u1eed d\u1ee5ng sai b\u1ed9 b\u1ea3o v\u1ec7 b\u1ed5 sung UL 1077 thay cho b\u1ed9 ng\u1eaft m\u1ea1ch UL 489 kh\u00f4ng ch\u1ec9 l\u00e0 m\u1ed9t sai l\u1ea7m k\u1ef9 thu\u1eadt\u2014\u0111\u00f3 l\u00e0 m\u1ed9t h\u00e0nh vi vi ph\u1ea1m quy t\u1eafc c\u00f3 th\u1ec3 d\u1eabn \u0111\u1ebfn h\u1eadu qu\u1ea3 nghi\u00eam tr\u1ecdng.<\/p>\n<h3>\u0110i\u1ec1u g\u00ec x\u1ea3y ra khi b\u1ea1n tr\u1ed9n l\u1eabn ch\u00fang?<\/h3>\n<p><strong>Ki\u1ec3m tra kh\u00f4ng \u0111\u1ea1t<\/strong>: C\u00e1c thanh tra \u0111i\u1ec7n v\u00e0 AHJ th\u01b0\u1eddng xuy\u00ean ki\u1ec3m tra b\u1ea3o v\u1ec7 qu\u00e1 d\u00f2ng th\u00edch h\u1ee3p tr\u00ean c\u00e1c m\u1ea1ch nh\u00e1nh. M\u1ed9t thi\u1ebft b\u1ecb UL 1077 b\u1ea3o v\u1ec7 \u1ed5 c\u1eafm ho\u1eb7c d\u00e2y hi\u1ec7n tr\u01b0\u1eddng s\u1ebd k\u00edch ho\u1ea1t vi\u1ec7c t\u1eeb ch\u1ed1i g\u1eafn th\u1ebb \u0111\u1ecf. B\u1ea1n s\u1ebd ph\u1ea3i \u0111\u1ed1i m\u1eb7t v\u1edbi s\u1ef1 ch\u1eadm tr\u1ec5 c\u1ee7a d\u1ef1 \u00e1n, chi ph\u00ed l\u00e0m l\u1ea1i v\u00e0 tr\u00e1ch nhi\u1ec7m ph\u00e1p l\u00fd ti\u1ec1m \u1ea9n c\u1ee7a nh\u00e0 th\u1ea7u.<\/p>\n<p><strong>Ki\u1ec3m to\u00e1n UL kh\u00f4ng \u0111\u1ea1t<\/strong>: N\u1ebfu b\u1ea1n \u0111ang x\u00e2y d\u1ef1ng thi\u1ebft b\u1ecb \u0111\u01b0\u1ee3c li\u1ec7t k\u00ea trong danh s\u00e1ch UL (b\u1ea3ng \u0111i\u1ec1u khi\u1ec3n, m\u00e1y m\u00f3c, thi\u1ebft b\u1ecb), c\u00e1c ki\u1ec3m to\u00e1n vi\u00ean UL s\u1ebd x\u00e1c minh r\u1eb1ng c\u00e1c th\u00e0nh ph\u1ea7n \u0111\u01b0\u1ee3c s\u1eed d\u1ee5ng trong ph\u1ea1m vi ch\u1ee9ng nh\u1eadn c\u1ee7a ch\u00fang. S\u1eed d\u1ee5ng th\u00e0nh ph\u1ea7n UL Recognized (1077) khi y\u00eau c\u1ea7u thi\u1ebft b\u1ecb UL Listed (489) vi ph\u1ea1m danh s\u00e1ch v\u00e0 c\u00f3 th\u1ec3 d\u1eabn \u0111\u1ebfn m\u1ea5t ch\u1ee9ng nh\u1eadn UL c\u1ee7a b\u1ea1n.<\/p>\n<p><strong>R\u1ee7i ro an to\u00e0n<\/strong>: Trong \u0111i\u1ec1u ki\u1ec7n s\u1ef1 c\u1ed1 cao, thi\u1ebft b\u1ecb UL 1077 c\u00f3 th\u1ec3 kh\u00f4ng ng\u1eaft m\u1ed9t c\u00e1ch an to\u00e0n d\u00f2ng \u0111i\u1ec7n ng\u1eafn m\u1ea1ch c\u00f3 s\u1eb5n. N\u1ebfu kh\u00f4ng c\u00f3 kh\u1ea3 n\u0103ng tri\u1ec7t ti\u00eau h\u1ed3 quang v\u00e0 kho\u1ea3ng h\u1edf \u0111i\u1ec7n th\u00edch h\u1ee3p, thi\u1ebft b\u1ecb c\u00f3 th\u1ec3 h\u1ecfng h\u00f3c nghi\u00eam tr\u1ecdng\u2014d\u1eabn \u0111\u1ebfn h\u1ecfa ho\u1ea1n, vi ph\u1ea1m v\u1ecf b\u1ecdc ho\u1eb7c nguy c\u01a1 \u0111i\u1ec7n gi\u1eadt.<\/p>\n<p><strong>C\u00e1c v\u1ea5n \u0111\u1ec1 v\u1ec1 b\u1ea3o hi\u1ec3m v\u00e0 tr\u00e1ch nhi\u1ec7m ph\u00e1p l\u00fd<\/strong>: Trong tr\u01b0\u1eddng h\u1ee3p h\u1ecfa ho\u1ea1n ho\u1eb7c th\u01b0\u01a1ng t\u00edch do \u0111i\u1ec7n, c\u00e1c cu\u1ed9c \u0111i\u1ec1u tra s\u1ebd xem x\u00e9t k\u1ef9 l\u01b0\u1ee1ng xem t\u1ea5t c\u1ea3 c\u00e1c thi\u1ebft b\u1ecb c\u00f3 \u0111\u01b0\u1ee3c \u00e1p d\u1ee5ng \u0111\u00fang c\u00e1ch hay kh\u00f4ng. Vi\u1ec7c l\u1ef1a ch\u1ecdn thi\u1ebft b\u1ecb kh\u00f4ng ch\u00ednh x\u00e1c c\u00f3 th\u1ec3 l\u00e0m m\u1ea5t hi\u1ec7u l\u1ef1c b\u1ea3o hi\u1ec3m v\u00e0 khi\u1ebfn c\u00f4ng ty c\u1ee7a b\u1ea1n ph\u1ea3i ch\u1ecbu tr\u00e1ch nhi\u1ec7m ph\u00e1p l\u00fd.<\/p>\n<h3>C\u00e1c bi\u1ec7n ph\u00e1p t\u1ed1t nh\u1ea5t cho c\u00e1c c\u1eeda h\u00e0ng b\u1ea3ng \u0111i\u1ec1u khi\u1ec3n v\u00e0 OEM<\/h3>\n<p><strong>1. Thi\u1ebft l\u1eadp c\u00e1c ch\u00ednh s\u00e1ch mua s\u1eafm r\u00f5 r\u00e0ng<\/strong>: Ph\u00e2n t\u00e1ch kho UL 489 v\u00e0 UL 1077 v\u1ec1 m\u1eb7t v\u1eadt l\u00fd v\u00e0 trong c\u01a1 s\u1edf d\u1eef li\u1ec7u b\u1ed9 ph\u1eadn c\u1ee7a b\u1ea1n. S\u1eed d\u1ee5ng s\u1ed1 b\u1ed9 ph\u1eadn v\u00e0 nh\u00e3n ri\u00eang bi\u1ec7t \u0111\u1ec3 ng\u01b0\u1eddi l\u1eafp r\u00e1p kh\u00f4ng v\u00f4 t\u00ecnh thay th\u1ebf c\u00e1i n\u00e0y cho c\u00e1i kia.<\/p>\n<p><strong>2. \u0110\u00e0o t\u1ea1o nh\u00f3m c\u1ee7a b\u1ea1n<\/strong>: \u0110\u1ea3m b\u1ea3o c\u00e1c k\u1ef9 s\u01b0, k\u1ef9 thu\u1eadt vi\u00ean v\u00e0 nh\u00e2n vi\u00ean mua h\u00e0ng hi\u1ec3u s\u1ef1 kh\u00e1c bi\u1ec7t. M\u1ed9t bu\u1ed5i \u0111\u00e0o t\u1ea1o 30 ph\u00fat c\u00f3 th\u1ec3 ti\u1ebft ki\u1ec7m h\u00e0ng ngh\u00ecn chi ph\u00ed l\u00e0m l\u1ea1i.<\/p>\n<p><strong>3. \u0110\u00e1nh gi\u00e1 thi\u1ebft k\u1ebf<\/strong>: Bao g\u1ed3m l\u1ef1a ch\u1ecdn thi\u1ebft b\u1ecb qu\u00e1 d\u00f2ng nh\u01b0 m\u1ed9t \u0111i\u1ec3m ki\u1ec3m tra b\u1eaft bu\u1ed9c trong \u0111\u00e1nh gi\u00e1 thi\u1ebft k\u1ebf b\u1ea3ng \u0111i\u1ec1u khi\u1ec3n c\u1ee7a b\u1ea1n. H\u00e3y h\u1ecfi: \u201cD\u00e2y d\u1eabn n\u00e0y c\u00f3 r\u1eddi kh\u1ecfi v\u1ecf b\u1ecdc kh\u00f4ng? N\u1ebfu c\u00f3, n\u00f3 c\u00f3 \u0111\u01b0\u1ee3c b\u1ea3o v\u1ec7 b\u1edfi thi\u1ebft b\u1ecb UL 489 kh\u00f4ng?\u201d<\/p>\n<p><strong>4. Ghi nh\u00e3n r\u00f5 r\u00e0ng cho c\u00e1c b\u1ea3ng \u0111i\u1ec1u khi\u1ec3n c\u1ee7a b\u1ea1n<\/strong>: S\u1eed d\u1ee5ng d\u1ea5u d\u00e2y ho\u1eb7c l\u1ecbch tr\u00ecnh b\u1ea3ng \u0111i\u1ec1u khi\u1ec3n \u0111\u1ec3 cho bi\u1ebft m\u1ea1ch n\u00e0o l\u00e0 m\u1ea1ch nh\u00e1nh (UL 489) v\u00e0 m\u1ea1ch n\u00e0o l\u00e0 m\u1ea1ch b\u00ean trong \u0111\u01b0\u1ee3c b\u1ea3o v\u1ec7 b\u1ed5 sung (UL 1077). \u0110i\u1ec1u n\u00e0y gi\u00fap \u00edch trong qu\u00e1 tr\u00ecnh b\u1ea3o tr\u00ec v\u00e0 s\u1eeda \u0111\u1ed5i trong t\u01b0\u01a1ng lai.<\/p>\n<p><strong>5. Khi nghi ng\u1edd, h\u00e3y s\u1eed d\u1ee5ng UL 489<\/strong>: N\u1ebfu b\u1ea1n kh\u00f4ng ch\u1eafc ch\u1eafn li\u1ec7u m\u1ed9t m\u1ea1ch c\u00f3 \u0111\u1ee7 \u0111i\u1ec1u ki\u1ec7n l\u00e0 \u201cd\u00e2y b\u00ean trong\u201d hay kh\u00f4ng, h\u00e3y m\u1eb7c \u0111\u1ecbnh l\u00e0 b\u1ed9 ng\u1eaft m\u1ea1ch UL 489. N\u00f3 \u0111\u1eaft h\u01a1n ban \u0111\u1ea7u nh\u01b0ng lo\u1ea1i b\u1ecf r\u1ee7i ro tu\u00e2n th\u1ee7.<\/p>\n<p><strong>6. Tham kh\u1ea3o ti\u00eau chu\u1ea9n s\u1ea3n ph\u1ea9m cu\u1ed1i<\/strong>: Tham kh\u1ea3o UL 508A (b\u1ea3ng \u0111i\u1ec1u khi\u1ec3n), NFPA 79 (m\u00e1y m\u00f3c) ho\u1eb7c c\u00e1c ti\u00eau chu\u1ea9n thi\u1ebft b\u1ecb UL c\u00f3 li\u00ean quan.<\/p>\n<h3>M\u1ed9t l\u1eddi v\u1ec1 chi ph\u00ed<\/h3>\n<p>\u0110\u00fang v\u1eady, b\u1ed9 ng\u1eaft m\u1ea1ch UL 489 c\u00f3 gi\u00e1 cao h\u01a1n 2-3 l\u1ea7n so v\u1edbi thi\u1ebft b\u1ecb UL 1077, nh\u01b0ng s\u1ef1 kh\u00e1c bi\u1ec7t ph\u1ea3n \u00e1nh th\u1eed nghi\u1ec7m nghi\u00eam ng\u1eb7t v\u00e0 ph\u00ea duy\u1ec7t \u1ee9ng d\u1ee5ng r\u1ed9ng h\u01a1n. S\u1eed d\u1ee5ng UL 1077 khi y\u00eau c\u1ea7u UL 489 c\u00f3 th\u1ec3 t\u1ed1n 10.000 \u0111\u00f4 la tr\u1edf l\u00ean cho vi\u1ec7c l\u00e0m l\u1ea1i v\u00e0 ch\u1eadm tr\u1ec5 d\u1ef1 \u00e1n.<\/p>\n<h2>Nh\u1eefng C\u00e2u H\u1ecfi Th\u01b0\u1eddng<\/h2>\n<p><strong>H: T\u00f4i c\u00f3 th\u1ec3 s\u1eed d\u1ee5ng b\u1ed9 b\u1ea3o v\u1ec7 b\u1ed5 sung UL 1077 n\u1ebfu t\u00f4i \u0111\u00e3 c\u00f3 b\u1ed9 ng\u1eaft m\u1ea1ch UL 489 \u1edf ph\u00eda tr\u00ean kh\u00f4ng?<\/strong><\/p>\n<p>\u0110: \u0110i\u1ec1u \u0111\u00f3 ph\u1ee5 thu\u1ed9c v\u00e0o \u1ee9ng d\u1ee5ng. N\u1ebfu thi\u1ebft b\u1ecb UL 1077 \u0111ang b\u1ea3o v\u1ec7 h\u1ec7 th\u1ed1ng d\u00e2y \u0111i\u1ec7n b\u00ean trong thi\u1ebft b\u1ecb (c\u00e1c m\u1ea1ch n\u1eb1m b\u00ean trong v\u1ecf b\u1ecdc), th\u00ec c\u00f3\u2014\u0111\u00f3 l\u00e0 m\u1ee5c \u0111\u00edch s\u1eed d\u1ee5ng c\u1ee7a n\u00f3. Nh\u01b0ng n\u1ebfu m\u1ea1ch c\u1ea5p ngu\u1ed3n cho \u1ed5 c\u1eafm ho\u1eb7c d\u00e2y hi\u1ec7n tr\u01b0\u1eddng tho\u00e1t ra kh\u1ecfi v\u1ecf b\u1ecdc, th\u00ec kh\u00f4ng\u2014b\u1ea1n ph\u1ea3i s\u1eed d\u1ee5ng b\u1ed9 ng\u1eaft m\u1ea1ch UL 489 cho m\u1ea1ch \u0111\u00f3, ngay c\u1ea3 khi c\u00f3 m\u1ed9t UL 489 kh\u00e1c \u1edf ph\u00eda tr\u00ean.<\/p>\n<p><strong>H: T\u1ea1i sao thi\u1ebft b\u1ecb UL 1077 l\u1ea1i r\u1ebb h\u01a1n nhi\u1ec1u so v\u1edbi b\u1ed9 ng\u1eaft m\u1ea1ch UL 489?<\/strong><\/p>\n<p>\u0110: Thi\u1ebft b\u1ecb UL 1077 tr\u1ea3i qua qu\u00e1 tr\u00ecnh th\u1eed nghi\u1ec7m \u00edt nghi\u00eam ng\u1eb7t h\u01a1n v\u00ec ch\u00fang \u0111\u01b0\u1ee3c thi\u1ebft k\u1ebf \u0111\u1ec3 ho\u1ea1t \u0111\u1ed9ng b\u00ean trong thi\u1ebft b\u1ecb \u0111\u00e3 c\u00f3 b\u1ea3o v\u1ec7 m\u1ea1ch nh\u00e1nh. Ch\u00fang c\u00f3 y\u00eau c\u1ea7u v\u1ec1 kh\u1ea3 n\u0103ng c\u1eaft th\u1ea5p h\u01a1n, gi\u1ea3m ti\u00eau chu\u1ea9n kho\u1ea3ng c\u00e1ch v\u00e0 \u0111\u01b0\u1ee3c ch\u1ee9ng nh\u1eadn l\u00e0 c\u00e1c th\u00e0nh ph\u1ea7n ch\u1ee9 kh\u00f4ng ph\u1ea3i l\u00e0 s\u1ea3n ph\u1ea9m \u0111\u1ed9c l\u1eadp. Ph\u1ea1m vi h\u1eb9p h\u01a1n n\u00e0y l\u00e0m gi\u1ea3m chi ph\u00ed s\u1ea3n xu\u1ea5t v\u00e0 th\u1eed nghi\u1ec7m.<\/p>\n<p><strong>H: \u0110i\u1ec1u g\u00ec x\u1ea3y ra n\u1ebfu thanh tra vi\u00ean t\u00ecm th\u1ea5y thi\u1ebft b\u1ecb UL 1077 b\u1ea3o v\u1ec7 \u1ed5 c\u1eafm?<\/strong><\/p>\n<p>\u0110: Vi\u1ec7c l\u1eafp \u0111\u1eb7t s\u1ebd kh\u00f4ng \u0111\u1ea1t ki\u1ec3m tra. B\u1ea1n s\u1ebd nh\u1eadn \u0111\u01b0\u1ee3c th\u00f4ng b\u00e1o vi ph\u1ea1m quy t\u1eafc y\u00eau c\u1ea7u s\u1eeda ch\u1eefa tr\u01b0\u1edbc khi d\u1ef1 \u00e1n c\u00f3 th\u1ec3 ti\u1ebfn h\u00e0nh. \u0110i\u1ec1u n\u00e0y th\u01b0\u1eddng c\u00f3 ngh\u0129a l\u00e0 thay th\u1ebf thi\u1ebft b\u1ecb UL 1077 b\u1eb1ng b\u1ed9 ng\u1eaft m\u1ea1ch UL 489 \u0111\u01b0\u1ee3c \u0111\u1ecbnh m\u1ee9c \u0111\u00fang c\u00e1ch v\u00e0 c\u00f3 kh\u1ea3 n\u0103ng \u0111\u1ecbnh tuy\u1ebfn l\u1ea1i d\u00e2y \u0111\u1ec3 \u0111\u00e1p \u1ee9ng quy t\u1eafc.<\/p>\n<p><strong>H: T\u00f4i c\u00f3 th\u1ec3 s\u1eed d\u1ee5ng thi\u1ebft b\u1ecb UL 1077 trong b\u1ea3ng \u0111i\u1ec7n d\u00e2n d\u1ee5ng kh\u00f4ng?<\/strong><\/p>\n<p>\u0110: Kh\u00f4ng. C\u00e1c m\u1ea1ch nh\u00e1nh d\u00e2n d\u1ee5ng y\u00eau c\u1ea7u b\u1ed9 ng\u1eaft m\u1ea1ch UL 489 theo NEC. Thi\u1ebft b\u1ecb UL 1077 ch\u1ec9 d\u00e0nh cho s\u1eed d\u1ee5ng b\u00ean trong thi\u1ebft b\u1ecb.<\/p>\n<p><strong>H: L\u00e0m c\u00e1ch n\u00e0o \u0111\u1ec3 x\u00e1c \u0111\u1ecbnh lo\u1ea1i thi\u1ebft b\u1ecb t\u00f4i c\u00f3?<\/strong><\/p>\n<p>\u0110: Ki\u1ec3m tra d\u1ea5u ch\u1ee9ng nh\u1eadn: d\u1ea5u \u201cUL\u201d h\u00ecnh tr\u00f2n (489) ho\u1eb7c d\u1ea5u \u201cUR\u201d \/ \u201cUL Recognized Component\u201d (1077).<\/p>\n<hr style=\"margin: 40px 0; border: 0; border-top: 1px solid #ccc;\" \/>\n<h2>K\u1ebft lu\u1eadn<\/h2>\n<p>Aptomat UL 489 v\u00e0 thi\u1ebft b\u1ecb b\u1ea3o v\u1ec7 ph\u1ee5 tr\u1ee3 UL 1077 ph\u1ee5c v\u1ee5 c\u00e1c vai tr\u00f2 kh\u00e1c nhau. Aptomat b\u1ea3o v\u1ec7 m\u1ea1ch nh\u00e1nh, h\u1ec7 th\u1ed1ng d\u00e2y \u0111i\u1ec7n v\u00e0 \u1ed5 c\u1eafm v\u1edbi \u0111\u1ea7y \u0111\u1ee7 danh s\u00e1ch UL v\u00e0 tu\u00e2n th\u1ee7 NEC. Thi\u1ebft b\u1ecb b\u1ea3o v\u1ec7 ph\u1ee5 tr\u1ee3 cung c\u1ea5p kh\u1ea3 n\u0103ng b\u1ea3o v\u1ec7 thi\u1ebft b\u1ecb b\u00ean trong \u1edf nh\u1eefng n\u01a1i \u0111\u00e3 c\u00f3 b\u1ea3o v\u1ec7 m\u1ea1ch nh\u00e1nh.<\/p>\n<p>Quy t\u1eafc r\u1ea5t \u0111\u01a1n gi\u1ea3n: d\u00e2y d\u1eabn r\u1eddi kh\u1ecfi v\u1ecf ho\u1eb7c c\u1ea5p ngu\u1ed3n cho \u1ed5 c\u1eafm? S\u1eed d\u1ee5ng UL 489. B\u1ea3o v\u1ec7 m\u1ed9t m\u1ea1ch con b\u00ean trong v\u1edbi UL 489 \u1edf ph\u00eda tr\u01b0\u1edbc? UL 1077 ho\u1ea1t \u0111\u1ed9ng.<\/p>\n<p>VIOX Electric cung c\u1ea5p aptomat v\u00e0 thi\u1ebft b\u1ecb b\u1ea3o v\u1ec7 ph\u1ee5 tr\u1ee3 c\u1ea5p c\u00f4ng nghi\u1ec7p \u0111\u00e1p \u1ee9ng c\u1ea3 ti\u00eau chu\u1ea9n UL 489 v\u00e0 UL 1077\u2014\u0111\u01b0\u1ee3c thi\u1ebft k\u1ebf \u0111\u1ec3 tu\u00e2n th\u1ee7 v\u00e0 ho\u1ea1t \u0111\u1ed9ng l\u00e2u d\u00e0i trong c\u00e1c \u1ee9ng d\u1ee5ng \u0111\u00f2i h\u1ecfi kh\u1eaft khe.<\/p>\n<\/div>\n<div class=\"simg-pop-btn\" style=\"top: 1431.66px; left: 14px; display: none;\"><\/div>\n<div class=\"simg-pop-btn\" style=\"top: 1431.66px; left: 14px; display: none;\"><\/div>\n<div class=\"simg-pop-btn\" style=\"top: 4256.38px; left: 14px; display: none;\"><\/div>\n<div class=\"simg-pop-btn\" style=\"top: 4256.38px; left: 14px; display: none;\"><\/div>\n<div class=\"simg-pop-btn\" style=\"top: 5658.54px; left: 14px; display: none;\"><\/div>\n<div class=\"simg-pop-btn\" style=\"top: 5658.54px; left: 14px; display: none;\"><\/div>","protected":false},"excerpt":{"rendered":"<p>In electrical control panels, you might encounter two nearly identical DIN rail devices: same form factor, same amperage, same toggle. One costs $50. The other? Just $15. The difference isn&#8217;t marketing\u2014it&#8217;s regulation. This pricing gap marks a critical regulatory divide. Panel shops, OEM manufacturers, and electrical contractors need to understand the distinction between UL 489 [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":20889,"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-20887","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\/20887","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=20887"}],"version-history":[{"count":1,"href":"https:\/\/test.viox.com\/vi\/wp-json\/wp\/v2\/posts\/20887\/revisions"}],"predecessor-version":[{"id":20888,"href":"https:\/\/test.viox.com\/vi\/wp-json\/wp\/v2\/posts\/20887\/revisions\/20888"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/test.viox.com\/vi\/wp-json\/wp\/v2\/media\/20889"}],"wp:attachment":[{"href":"https:\/\/test.viox.com\/vi\/wp-json\/wp\/v2\/media?parent=20887"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/test.viox.com\/vi\/wp-json\/wp\/v2\/categories?post=20887"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/test.viox.com\/vi\/wp-json\/wp\/v2\/tags?post=20887"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}