{"id":2726,"date":"2026-06-11T05:57:43","date_gmt":"2026-06-11T05:57:43","guid":{"rendered":"https:\/\/huyuglobal.com\/?p=2726"},"modified":"2026-06-11T05:57:45","modified_gmt":"2026-06-11T05:57:45","slug":"motor-circuit-protector-vs-circuit-breaker-2","status":"publish","type":"post","link":"https:\/\/huyuglobal.com\/vi\/blog\/motor-circuit-protector-vs-circuit-breaker-2\/","title":{"rendered":"B\u1ea3o v\u1ec7 m\u1ea1ch \u0111\u1ed9ng c\u01a1 so v\u1edbi b\u1ed9 ng\u1eaft m\u1ea1ch"},"content":{"rendered":"

C\u00f3 nhi\u1ec1u tr\u01b0\u1eddng h\u1ee3p minh h\u1ecda c\u00e1ch m\u00e0 c\u00e1c \u0111\u1eb7c t\u00ednh t\u1ea3i c\u1ee7a m\u1ed9t \u0111\u1ed9ng c\u01a1 kh\u00e1c v\u1edbi c\u00e1c \u0111\u1eb7c t\u00ednh c\u1ee7a m\u1ed9t thi\u1ebft b\u1ecb s\u01b0\u1edfi ho\u1eb7c m\u1ea1ch chi\u1ebfu s\u00e1ng. M\u1ed9t v\u00ed d\u1ee5 nh\u01b0 v\u1eady l\u00e0 m\u1ed9t tr\u01b0\u1eddng h\u1ee3p x\u1ea3y ra v\u00e0i n\u0103m tr\u01b0\u1edbc, khi m\u1ed9t th\u1ee3 \u0111i\u1ec7n b\u1ea3o tr\u00ec \u0111\u01b0\u1ee3c g\u1ecdi \u0111\u1ebfn m\u1ed9t c\u01a1 s\u1edf ch\u1ebf bi\u1ebfn th\u1ef1c ph\u1ea9m do m\u1ed9t s\u1ef1 c\u1ed1 ng\u1eebng s\u1ea3n xu\u1ea5t kh\u00f4ng mong \u0111\u1ee3i. \u0110\u1ed9ng c\u01a1 \u0111i\u1ec7n cung c\u1ea5p n\u0103ng l\u01b0\u1ee3ng cho to\u00e0n b\u1ed9 ph\u1ea7n \u0111\u00f3ng g\u00f3i (20 m\u00e3 l\u1ef1c) \u0111\u00e3 ng\u1eaft c\u1ea7u dao c\u1ee7a n\u00f3. Sau khi \u0111\u1eb7t l\u1ea1i c\u1ea7u dao, th\u1ee3 \u0111i\u1ec7n \u0111\u00e3 c\u1ed1 g\u1eafng kh\u1edfi \u0111\u1ed9ng l\u1ea1i \u0111\u1ed9ng c\u01a1, ch\u1ec9 \u0111\u1ec3 ph\u00e1t hi\u1ec7n r\u1eb1ng n\u00f3 \u0111\u00e3 ng\u1eaft m\u1ed9t l\u1ea7n n\u1eefa khi kh\u1edfi \u0111\u1ed9ng. Sau khi ch\u1ea9n \u0111o\u00e1n v\u1ea5n \u0111\u1ec1, th\u1ee3 \u0111i\u1ec7n ph\u00e1t hi\u1ec7n r\u1eb1ng ai \u0111\u00f3 \u0111\u00e3 l\u1eafp \u0111\u1eb7t m\u1ed9t thi\u1ebft b\u1ecb b\u1ea3o v\u1ec7 m\u1ea1ch m\u1edbi (c\u1ea7u dao) thay cho thi\u1ebft b\u1ecb b\u1ea3o v\u1ec7 m\u1ea1ch \u0111\u1ed9ng c\u01a1 ban \u0111\u1ea7u (c\u00f2n \u0111\u01b0\u1ee3c g\u1ecdi l\u00e0 kh\u1edfi \u0111\u1ed9ng \u0111\u1ed9ng c\u01a1).<\/p>\n

Thi\u1ebft b\u1ecb b\u1ea3o v\u1ec7 m\u1ea1ch m\u1edbi \u0111\u01b0\u1ee3c l\u1eafp \u0111\u1eb7t l\u00e0 m\u1ed9t thi\u1ebft b\u1ecb nhi\u1ec7t t\u1eeb ti\u00eau chu\u1ea9n c\u1ea7u dao<\/strong><\/a> v\u1edbi m\u1ed9t m\u1ee9c d\u00f2ng \u0111i\u1ec7n b\u1eb1ng v\u1edbi kh\u1edfi \u0111\u1ed9ng \u0111\u1ed9ng c\u01a1 ban \u0111\u1ea7u; tuy nhi\u00ean, n\u00f3 c\u00f3 m\u1ed9t c\u00e0i \u0111\u1eb7t ng\u1eaft t\u1eeb t\u00ednh qu\u00e1 th\u1ea5p \u0111\u1ec3 cho ph\u00e9p \u0111\u1ee7 th\u1eddi gian cho d\u00f2ng \u0111i\u1ec7n kh\u1edfi \u0111\u1ed9ng b\u00ecnh th\u01b0\u1eddng c\u1ee7a \u0111\u1ed9ng c\u01a1 \u1ed5n \u0111\u1ecbnh \u1edf m\u1ee9c tr\u1ea1ng th\u00e1i \u1ed5n \u0111\u1ecbnh. M\u1eb7t kh\u00e1c, c\u00e0i \u0111\u1eb7t ng\u1eaft t\u1eeb t\u00ednh c\u1ee7a thi\u1ebft b\u1ecb b\u1ea3o v\u1ec7 m\u1ea1ch m\u1edbi \u0111\u01b0\u1ee3c l\u1eafp \u0111\u1eb7t \u0111\u00e3 \u0111\u01b0\u1ee3c \u0111\u1eb7t \u0111\u1ee7 cao \u0111\u1ec3 cung c\u1ea5p m\u1ed9t d\u00f2ng \u0111i\u1ec7n kh\u1edfi \u0111\u1ed9ng qu\u00e1 m\u1ee9c, \u0111i\u1ec1u n\u00e0y cu\u1ed1i c\u00f9ng \u0111\u00e3 l\u00e0m h\u1ecfng \u0111\u1ed9ng c\u01a1 (l\u00e0m gi\u1ea3m c\u00e1ch \u0111i\u1ec7n cu\u1ed9n d\u00e2y), m\u00e0 cu\u1ed1i c\u00f9ng s\u1ebd y\u00eau c\u1ea7u qu\u1ea5n l\u1ea1i \u0111\u1ed9ng c\u01a1 v\u1edbi chi ph\u00ed $1,200. Khi c\u00e1c k\u1ef9 s\u01b0 v\u00e0 k\u1ef9 thu\u1eadt vi\u00ean b\u01b0\u1edbc v\u00e0o th\u1ebf gi\u1edbi chuy\u00ean nghi\u1ec7p, h\u1ecd cu\u1ed1i c\u00f9ng ph\u00e1t hi\u1ec7n ra m\u1ed9t trong nh\u1eefng s\u1ef1 th\u1eadt c\u01a1 b\u1ea3n c\u1ee7a thi\u1ebft k\u1ebf, \u0111\u00f3 l\u00e0, vi\u1ec7c b\u1ea3o v\u1ec7 cho m\u1ed9t t\u1ea3i \u0111\u1ed9ng c\u01a1 ph\u1ea3i \u0111\u01b0\u1ee3c ch\u1ecdn d\u1ef1a tr\u00ean c\u00e1c \u0111\u1eb7c t\u00ednh \u0111\u1eb7c tr\u01b0ng c\u1ee7a \u0111\u1ed9ng c\u01a1, so v\u1edbi c\u00e1c \u0111\u1eb7c t\u00ednh \u0111\u1eb7c tr\u01b0ng c\u1ee7a m\u1ed9t thi\u1ebft b\u1ecb s\u01b0\u1edfi ho\u1eb7c t\u1ea3i chi\u1ebfu s\u00e1ng.<\/p>\n

Hai Thi\u1ebft B\u1ecb, Hai Ch\u1ee9c N\u0103ng Kh\u00e1c Nhau<\/h2>\n

M\u1eb7c d\u00f9 c\u00e1c thu\u1eadt ng\u1eef thi\u1ebft b\u1ecb b\u1ea3o v\u1ec7 m\u1ea1ch \u0111\u1ed9ng c\u01a1 v\u00e0 c\u1ea7u dao c\u00f3 th\u1ec3 \u0111\u01b0\u1ee3c s\u1eed d\u1ee5ng thay th\u1ebf cho nhau, nh\u01b0ng ch\u00fang th\u1ef1c s\u1ef1 m\u00f4 t\u1ea3 hai lo\u1ea1i thi\u1ebft b\u1ecb kh\u00e1c nhau v\u1edbi thi\u1ebft k\u1ebf n\u1ed9i b\u1ed9 r\u1ea5t kh\u00e1c nhau ph\u1ee5c v\u1ee5 c\u00e1c ch\u1ee9c n\u0103ng kh\u00e1c nhau trong m\u1ed9t m\u1ea1ch nh\u00e1nh \u0111\u1ed9ng c\u01a1. M\u1ed9t c\u1ea7u dao ti\u00eau chu\u1ea9n, th\u01b0\u1eddng l\u00e0 c\u1ea7u dao mini (MCB) ho\u1eb7c c\u1ea7u dao v\u1ecf \u0111\u00fac (MCCB), l\u00e0 m\u1ed9t thi\u1ebft b\u1ecb \u0111\u00e3 \u0111\u01b0\u1ee3c thi\u1ebft k\u1ebf \u0111\u1ec3 cung c\u1ea5p b\u1ea3o v\u1ec7 \u0111a n\u0103ng cho d\u00e2y v\u00e0 t\u1ea3i chung \u0111\u01b0\u1ee3c k\u1ebft n\u1ed1i kh\u1ecfi t\u00ecnh tr\u1ea1ng qu\u00e1 t\u1ea3i v\u00e0 ng\u1eafn m\u1ea1ch b\u1eb1ng c\u00e1ch cung c\u1ea5p c\u1ea3 b\u1ea3o v\u1ec7 qu\u00e1 t\u1ea3i v\u00e0 ng\u1eafn m\u1ea1ch th\u00f4ng qua y\u1ebfu t\u1ed1 nhi\u1ec7t bimetallic v\u00e0 cu\u1ed9n \u0111i\u1ec7n t\u1eeb c\u1ee7a n\u00f3, \u0111\u01b0\u1ee3c ch\u1ee9a trong m\u1ed9t \u0111\u01a1n v\u1ecb duy nh\u1ea5t. Ng\u01b0\u1ee3c l\u1ea1i, m\u1ed9t thi\u1ebft b\u1ecb b\u1ea3o v\u1ec7 m\u1ea1ch \u0111\u1ed9ng c\u01a1 (MCP) l\u00e0 m\u1ed9t thi\u1ebft b\u1ecb \u0111\u00e3 \u0111\u01b0\u1ee3c thi\u1ebft k\u1ebf \u0111\u1eb7c bi\u1ec7t \u0111\u1ec3 ch\u1ec9 cung c\u1ea5p b\u1ea3o v\u1ec7 ng\u1eafn m\u1ea1ch t\u1eeb t\u00ednh (\u0111i\u1ec7n t\u1eeb). M\u1ed9t MCP c\u00f3 m\u1ed9t c\u00e0i \u0111\u1eb7t ng\u1eaft t\u1ee9c th\u00ec c\u00f3 th\u1ec3 \u0111i\u1ec1u ch\u1ec9nh v\u00e0 ph\u1ea3i \u0111\u01b0\u1ee3c s\u1eed d\u1ee5ng nh\u01b0 m\u1ed9t ph\u1ea7n c\u1ee7a b\u1ed9 \u0111i\u1ec1u khi\u1ec3n \u0111\u1ed9ng c\u01a1 k\u1ebft h\u1ee3p \u0111\u01b0\u1ee3c li\u1ec7t k\u00ea khi s\u1eed d\u1ee5ng v\u1edbi m\u1ed9t c\u00f4ng t\u1eafc v\u00e0 r\u01a1 le qu\u00e1 t\u1ea3i ri\u00eang bi\u1ec7t \u0111\u1ec3 cung c\u1ea5p c\u1ea3 b\u1ea3o v\u1ec7 nhi\u1ec7t cho \u0111\u1ed9ng c\u01a1 v\u00e0 x\u00f3a ng\u1eafn m\u1ea1ch b\u1edfi MCP. Kh\u00f4ng thi\u1ebft b\u1ecb n\u00e0o s\u1ebd cung c\u1ea5p ch\u1ee9c n\u0103ng c\u1ee7a thi\u1ebft b\u1ecb kia, v\u00e0 vi\u1ec7c s\u1eed d\u1ee5ng hai thi\u1ebft b\u1ecb kh\u00f4ng \u0111\u00fang c\u00e1ch l\u00e0 m\u1ed9t c\u00e1ch \u0111\u1ec3 g\u1eb7p ph\u1ea3i lo\u1ea1i s\u1ef1 c\u1ed1 m\u00e0 nh\u00e0 m\u00e1y th\u1ef1c ph\u1ea9m \u0111\u00e3 tr\u1ea3i qua.<\/p>\n

\"T\u1ea1i<\/p>\n

T\u1ea1i sao m\u1ed9t MCB ti\u00eau chu\u1ea9n l\u1ea1i th\u1ea5t b\u1ea1i trong nhi\u1ec7m v\u1ee5 \u0111\u1ed9ng c\u01a1<\/h2>\n

Khi kh\u1edfi \u0111\u1ed9ng, m\u1ed9t \u0111\u1ed9ng c\u01a1 s\u1ebd c\u00f3 d\u00f2ng kh\u1edfi \u0111\u1ed9ng (ho\u1eb7c d\u00f2ng rotor b\u1ecb kh\u00f3a) c\u00f3 th\u1ec3 ch\u1ea1y t\u1eeb 6 \u0111\u1ebfn 8 l\u1ea7n d\u00f2ng t\u1ea3i \u0111\u1ea7y \u0111\u1ee7. D\u00f2ng kh\u1edfi \u0111\u1ed9ng n\u00e0y ch\u1ec9 k\u00e9o d\u00e0i trong m\u1ed9t ph\u1ea7n nh\u1ecf c\u1ee7a gi\u00e2y khi s\u1eed d\u1ee5ng kh\u1edfi \u0111\u1ed9ng tr\u1ef1c ti\u1ebfp, tuy nhi\u00ean, n\u00f3 c\u00f3 th\u1ec3 k\u00e9o d\u00e0i \u0111\u1ee7 l\u00e2u \u0111\u1ec3 v\u00e0o v\u00f9ng trip t\u1eeb t\u00ednh c\u1ee7a m\u1ed9t Miniature Circuit Breaker (MCB) ti\u00eau chu\u1ea9n. M\u1ed9t v\u00ed d\u1ee5 v\u1ec1 MCB lo\u1ea1i C 20-amp c\u00f3 ng\u01b0\u1ee1ng trip t\u1ee9c th\u00ec t\u1eeb 5 \u0111\u1ebfn 10 l\u1ea7n \u0111\u1ecbnh m\u1ee9c c\u1ee7a n\u00f3, c\u00f3 ngh\u0129a l\u00e0 n\u00f3 c\u00f3 th\u1ec3 trip t\u1eeb 100 \u0111\u1ebfn 200 ampe. D\u1ef1a tr\u00ean 120 ampe d\u00f2ng m\u00e0 m\u1ed9t \u0111\u1ed9ng c\u01a1 ti\u00eau th\u1ee5 khi kh\u1edfi \u0111\u1ed9ng, n\u00f3 x\u1ea3y ra ngay gi\u1eefa ng\u01b0\u1ee1ng trip c\u1ee7a MCB. Do \u0111\u00f3, c\u1ea7u dao c\u00f3 th\u1ec3 trip trong m\u1ed9t s\u1ed1 l\u1ea7n kh\u1edfi \u0111\u1ed9ng \u0111\u1ed9ng c\u01a1 v\u00e0 c\u00f3 th\u1ec3 gi\u1eef l\u1ea1i trong nh\u1eefng l\u1ea7n kh\u00e1c, d\u1ef1a tr\u00ean 2 y\u1ebfu t\u1ed1: 1) \u0111i\u1ec3m \u0111\u00f3ng c\u1ee7a c\u00e1c ti\u1ebfp \u0111i\u1ec3m \u0111\u1ed9ng c\u01a1 li\u00ean quan \u0111\u1ebfn d\u00f2ng (t\u1ee9c l\u00e0 \u0111i\u1ec3m th\u1ef1c t\u1ebf trong s\u00f3ng \u0111i\u1ec7n \u00e1p khi c\u00e1c ti\u1ebfp \u0111i\u1ec3m \u0111\u00f3ng), v\u00e0 2) m\u1ee9c \u0111\u1ed9 t\u1eeb t\u00ednh c\u00f2n l\u1ea1i (k\u00edch th\u01b0\u1edbc) trong l\u00f5i \u0111\u1ed9ng c\u01a1 t\u1ea1i th\u1eddi \u0111i\u1ec3m \u0111\u00f3ng m\u1ea1ch. S\u1ef1 kh\u00f4ng nh\u1ea5t qu\u00e1n n\u00e0y l\u00e0 nguy\u00ean nh\u00e2n d\u1eabn \u0111\u1ebfn vi\u1ec7c trip kh\u00f4ng mong mu\u1ed1n.
\nTh\u01b0\u1eddng th\u00ec, nh\u1eefng ng\u01b0\u1eddi s\u1eeda ch\u1eefa kh\u00f4ng th\u00f4ng th\u1ea1o s\u1ebd c\u1ed1 g\u1eafng kh\u1eafc ph\u1ee5c c\u00e1c v\u1ea5n \u0111\u1ec1 trip kh\u00f4ng mong mu\u1ed1n b\u1eb1ng c\u00e1ch \u0111i\u1ec1u ch\u1ec9nh sang m\u1ed9t c\u1ea7u dao l\u1edbn h\u01a1n; \u0111i\u1ec1u n\u00e0y s\u1ebd lo\u1ea1i b\u1ecf b\u1ea3o v\u1ec7 qu\u00e1 d\u00f2ng kh\u1ecfi d\u00e2y, t\u1eeb \u0111\u00f3 t\u1ea1o ra nguy c\u01a1 ch\u00e1y n\u1ed5.
\nC\u01a1 ch\u1ebf trip t\u1eeb t\u00ednh c\u1ee7a m\u1ed9t MCP s\u1ebd gi\u1ea3i quy\u1ebft v\u1ea5n \u0111\u1ec1 trip kh\u00f4ng mong mu\u1ed1n n\u00e0y b\u1eb1ng c\u00e1ch c\u00f3 m\u1ed9t c\u00e0i \u0111\u1eb7t trip t\u1eeb t\u00ednh \u0111i\u1ec1u ch\u1ec9nh \u0111\u01b0\u1ee3c (l\u00ean \u0111\u1ebfn 13 l\u1ea7n t\u1ea3i \u0111\u1ea7y \u0111\u1ee7 c\u1ee7a \u0111\u1ed9ng c\u01a1) m\u00e0 kh\u00f4ng c\u00f3 b\u1ea5t k\u1ef3 y\u1ebfu t\u1ed1 nhi\u1ec7t n\u00e0o s\u1ebd trip do qu\u00e1 t\u1ea3i k\u00e9o d\u00e0i; \u0111\u00f3 l\u00e0 c\u00f4ng vi\u1ec7c c\u1ee7a r\u01a1 le qu\u00e1 t\u1ea3i. \u0110\u1ec3 c\u00f3 c\u00e1i nh\u00ecn t\u1ed5ng qu\u00e1t h\u01a1n v\u1ec1 c\u00e1ch c\u00e1c c\u1ea7u dao ho\u1ea1t \u0111\u1ed9ng trong c\u00e1c \u1ee9ng d\u1ee5ng kh\u00e1c nhau, so s\u00e1nh c\u1ee7a ch\u00fang t\u00f4i v\u1ec1 c\u1ea7u dao so v\u1edbi b\u1ed9 b\u1ea3o v\u1ec7 qu\u00e1 \u00e1p<\/a> gi\u1ea3i th\u00edch n\u01a1i m\u00e0 b\u1ea3o v\u1ec7 qu\u00e1 d\u00f2ng k\u1ebft th\u00fac v\u00e0 b\u1ea3o v\u1ec7 qu\u00e1 \u00e1p b\u1eaft \u0111\u1ea7u.<\/p>\n

\"B\u1ed9<\/p>\n

B\u1ed9 ba b\u1ea3o v\u1ec7 \u0111\u1ed9ng c\u01a1 ph\u1ed1i h\u1ee3p<\/h2>\n

Theo ti\u00eau chu\u1ea9n NEC v\u00e0 UL, m\u1ed9t m\u1ea1ch nh\u00e1nh \u0111\u1ed9ng c\u01a1 ho\u00e0n ch\u1ec9nh bao g\u1ed3m ba thi\u1ebft b\u1ecb ho\u1ea1t \u0111\u1ed9ng c\u00f9ng nhau (\u0111\u1ec3 v\u1eadn h\u00e0nh \u0111\u1ed9ng c\u01a1 c\u1ee7a b\u1ea1n, kh\u00f4ng ch\u1ec9 \u0111\u01a1n thu\u1ea7n l\u00e0 v\u1eadn h\u00e0nh n\u00f3):<\/p>\n

    \n
  1. B\u1ea3o v\u1ec7 ng\u1eafn m\u1ea1ch v\u00e0 l\u1ed7i \u0111\u1ea5t:<\/strong>\u00a0M\u1ee5c \u0111\u00edch c\u1ee7a b\u1ed9 b\u1ea3o v\u1ec7 m\u1ea1ch \u0111\u1ed9ng c\u01a1 ho\u1eb7c MCCB (Molded Case Circuit Breaker) c\u00f3 \u0111\u1ecbnh m\u1ee9c \u0111\u1eb7c bi\u1ec7t l\u00e0 trip khi c\u00f3 l\u1ed7i bolted ho\u1eb7c l\u1ed7i \u0111\u1ea5t v\u00e0 \u0111\u1ec3 x\u00f3a b\u1ecf nh\u1eefng l\u1ed7i \u0111\u00f3 tr\u01b0\u1edbc khi d\u00f2ng c\u00f3 th\u1ec3 g\u00e2y h\u1ea1i cho d\u00e2y d\u1eabn ho\u1eb7c cu\u1ed9n d\u00e2y \u0111\u1ed9ng c\u01a1. N\u00f3 \u0111\u01b0\u1ee3c \u0111\u1eb7t tr\u00ean m\u1ee9c d\u00f2ng kh\u1edfi \u0111\u1ed9ng \u0111\u1ec3 ng\u0103n ch\u1eb7n c\u00e1c trip gi\u1ea3.<\/li>\n
  2. B\u1ea3o v\u1ec7 qu\u00e1 t\u1ea3i:<\/strong>\u00a0R\u01a1 le qu\u00e1 t\u1ea3i bao ph\u1ee7 to\u00e0n b\u1ed9 d\u00f2ng t\u1ea3i c\u1ee7a \u0111\u1ed9ng c\u01a1 c\u0169ng nh\u01b0 h\u1ec7 s\u1ed1 d\u1ecbch v\u1ee5 c\u1ee7a n\u00f3. \u0110i\u1ec1u n\u00e0y s\u1ebd b\u1ea3o v\u1ec7 \u0111\u1ed9ng c\u01a1 kh\u1ecfi c\u00e1c qu\u00e1 t\u1ea3i c\u01a1 h\u1ecdc k\u00e9o d\u00e0i, m\u1ea5t m\u1ed9t ho\u1eb7c nhi\u1ec1u pha, v\u00e0 c\u00e1c \u0111i\u1ec1u ki\u1ec7n rotor b\u1ecb kh\u00f3a k\u00e9o d\u00e0i v\u01b0\u1ee3t qu\u00e1 th\u1eddi gian kh\u1edfi \u0111\u1ed9ng. R\u01a1 le qu\u00e1 t\u1ea3i s\u1ebd trip \u1edf m\u1ee9c 115% ho\u1eb7c 125% c\u1ee7a d\u00f2ng t\u1ea3i \u0111\u1ea7y \u0111\u1ee7 c\u1ee7a \u0111\u1ed9ng c\u01a1 t\u00f9y thu\u1ed9c v\u00e0o c\u00e1ch \u0111\u1ed9ng c\u01a1 \u0111\u01b0\u1ee3c g\u00e1n nh\u00e3n (h\u1ec7 s\u1ed1 d\u1ecbch v\u1ee5) v\u00e0 nh\u1eefng g\u00ec \u0111\u01b0\u1ee3c y\u00eau c\u1ea7u b\u1edfi m\u00e3.<\/li>\n
  3. \u0110i\u1ec1u khi\u1ec3n:<\/strong>\u00a0Contactor ho\u1ea1t \u0111\u1ed9ng nh\u01b0 m\u1ed9t thi\u1ebft b\u1ecb chuy\u1ec3n m\u1ea1ch \u0111i\u1ec7n t\u1eeb cho \u0111\u1ed9ng c\u01a1 v\u00e0 b\u1eadt t\u1eaft \u0111\u1ed9ng c\u01a1 trong c\u00e1c \u0111i\u1ec1u ki\u1ec7n ho\u1ea1t \u0111\u1ed9ng b\u00ecnh th\u01b0\u1eddng. Contactor \u0111\u01b0\u1ee3c \u0111\u1ecbnh m\u1ee9c cho d\u00f2ng t\u1ea3i \u0111\u1ea7y \u0111\u1ee7 v\u00e0 d\u00f2ng rotor b\u1ecb kh\u00f3a c\u1ee7a \u0111\u1ed9ng c\u01a1.<\/li>\n<\/ol>\n

    MCP y\u00eau c\u1ea7u r\u01a1 le qu\u00e1 t\u1ea3i cung c\u1ea5p b\u1ea3o v\u1ec7 nhi\u1ec7t, \u0111i\u1ec1u n\u00e0y \u0111\u01b0\u1ee3c th\u1ef1c hi\u1ec7n b\u1edfi d\u1ea3i bimetal t\u00edch h\u1ee3p trong c\u00e1c c\u1ea7u dao \u0111i\u1ec7n truy\u1ec1n th\u1ed1ng. \u0110i\u1ec1u n\u00e0y \u0111\u01b0\u1ee3c th\u1ef1c hi\u1ec7n c\u00f3 ch\u1ee7 \u0111\u00edch \u0111\u1ec3 cho ph\u00e9p m\u1ed7i thi\u1ebft b\u1ecb b\u1ea3o v\u1ec7 \u0111\u01b0\u1ee3c thi\u1ebft k\u1ebf v\u00e0 t\u1ed1i \u01b0u h\u00f3a c\u1ee5 th\u1ec3 cho c\u00e1c \u1ee9ng d\u1ee5ng \u0111\u1ed9c \u0111\u00e1o c\u1ee7a ri\u00eang ch\u00fang. M\u1ed9t MCB ti\u00eau chu\u1ea9n c\u1ed1 g\u1eafng ph\u1ee5c v\u1ee5 c\u1ea3 hai ch\u1ee9c n\u0103ng b\u1eb1ng c\u00e1ch s\u1eed d\u1ee5ng m\u1ed9t \u0111\u1eb7c t\u00ednh kh\u00f4ng \u0111\u1ed5i, do \u0111\u00f3 \u0111\u1eb7t n\u00f3 ra ngo\u00e0i ph\u1ea1m vi s\u1eed d\u1ee5ng nh\u01b0 m\u1ed9t c\u1ea7u dao b\u1ea3o v\u1ec7 \u0111\u1ed9ng c\u01a1, ngo\u1ea1i tr\u1eeb v\u1edbi c\u00e1c \u0111\u1ed9ng c\u01a1 c\u00f4ng su\u1ea5t nh\u1ecf m\u00e0 d\u00f2ng kh\u1edfi \u0111\u1ed9ng qu\u00e1 nh\u1ecf \u0111\u1ec3 \u1ea3nh h\u01b0\u1edfng \u0111\u1ebfn hi\u1ec7u su\u1ea5t.<\/p>\n

    \"B\u1ed9<\/p>\n

    C\u1ea7u dao b\u1ea3o v\u1ec7 \u0111\u1ed9ng c\u01a1: M\u1ed9t l\u1ef1a ch\u1ecdn th\u1ee9 ba<\/h2>\n

    C\u1ea7u dao b\u1ea3o v\u1ec7 \u0111\u1ed9ng c\u01a1 (MPCBs) c\u00f3 c\u00e1c kh\u00eda c\u1ea1nh tr\u00f2n sau \u0111\u00e2y do y\u00eau c\u1ea7u c\u1ee7a B\u1ed9 lu\u1eadt \u0110i\u1ec7n Canada (CEC) v\u00e0 B\u1ed9 lu\u1eadt \u0110i\u1ec7n Qu\u1ed1c gia (NEC):
    \n\u2022 MPCBs, th\u01b0\u1eddng \u0111\u01b0\u1ee3c t\u00ecm th\u1ea5y c\u1ea3 \u1edf th\u1ecb tr\u01b0\u1eddng B\u1eafc M\u1ef9 v\u00e0 IEC, cung c\u1ea5p b\u1ea3o v\u1ec7 qu\u00e1 t\u1ea3i (nhi\u1ec7t) v\u00e0 b\u1ea3o v\u1ec7 ng\u1eafn m\u1ea1ch (t\u1eeb t\u00ednh) trong m\u1ed9t thi\u1ebft b\u1ecb duy nh\u1ea5t, \u0111\u01b0\u1ee3c ph\u00e2n lo\u1ea1i theo IEC-60947-4-1 l\u00e0 ph\u00f9 h\u1ee3p cho t\u1ea3i \u0111\u1ed9ng c\u01a1, v\u00e0 ph\u1ee5c v\u1ee5 nhi\u1ec1u \u1ee9ng d\u1ee5ng nh\u01b0 thi\u1ebft b\u1ecb b\u1ea3o v\u1ec7 \u0111\u1ed9ng c\u01a1 duy nh\u1ea5t, \u0111\u01a1n gi\u1ea3n h\u00f3a vi\u1ec7c \u0111\u1ea5u d\u00e2y v\u00e0 gi\u1ea3m kh\u00f4ng gian l\u1eafp \u0111\u1eb7t.
    \n\u2022 C\u00e0i \u0111\u1eb7t l\u1ed7i tr\u1ef1c ti\u1ebfp c\u1ee7a MPCB c\u1ee7a b\u1ea1n cung c\u1ea5p m\u1ed9t ph\u01b0\u01a1ng ti\u1ec7n linh ho\u1ea1t \u0111\u1ec3 b\u1ea3o v\u1ec7 ch\u1ed1ng l\u1ea1i c\u1ea3 d\u00f2ng kh\u1edfi \u0111\u1ed9ng c\u1ee7a \u0111\u1ed9ng c\u01a1, c\u0169ng nh\u01b0 c\u00e1c d\u00f2ng qu\u00e1 t\u1ea3i li\u00ean t\u1ee5c c\u1ee7a n\u00f3.
    \n\u2022 MCB ti\u00eau chu\u1ea9n c\u00f3 th\u1ec3 cung c\u1ea5p m\u1ed9t c\u00e0i \u0111\u1eb7t l\u1ed7i tr\u1ef1c ti\u1ebfp; tuy nhi\u00ean, n\u00f3 s\u1ebd t\u1ea1o ra m\u1ed9t \u0111i\u1ec1u ki\u1ec7n kh\u00f4ng kh\u1edbp khi \u0111\u01b0\u1ee3c s\u1eed d\u1ee5ng v\u1edbi c\u00e1c \u0111\u1ed9ng c\u01a1 do v\u1ea5n \u0111\u1ec1 MCB \u0111\u01b0\u1ee3c k\u00edch th\u01b0\u1edbc cho d\u00f2ng t\u1ea3i \u0111\u1ea7y \u0111\u1ee7 (FLC), trong khi MPCB c\u1ee7a b\u1ea1n \u0111\u01b0\u1ee3c k\u00edch th\u01b0\u1edbc cho d\u00f2ng kh\u1edfi \u0111\u1ed9ng.<\/p>\n

    Khi s\u1eed d\u1ee5ng m\u1ed9t thi\u1ebft b\u1ecb c\u00f3 th\u1ec3 \u0111\u1eb7t l\u1ea1i cho b\u1ea3o v\u1ec7 ng\u1eafn m\u1ea1ch v\u00e0 l\u1ed7i \u0111\u1ea5t t\u1ea1i \u0111i\u1ec3m ng\u1eaft \u0111\u1ed9ng c\u01a1, MPCB c\u1ee7a b\u1ea1n n\u00ean lu\u00f4n l\u00e0 thi\u1ebft b\u1ecb \u0111\u01b0\u1ee3c l\u1ef1a ch\u1ecdn.<\/p>\n

    Tuy nhi\u00ean, trong b\u1ed1i c\u1ea3nh c\u00e1c ph\u01b0\u01a1ng ph\u00e1p \u0111\u01b0\u1ee3c ch\u1ea5p nh\u1eadn r\u1ed9ng r\u00e3i \u0111\u1ec3 \u0111i\u1ec1u khi\u1ec3n \u0111\u1ed9ng c\u01a1 AC c\u00f4ng nghi\u1ec7p \u1edf B\u1eafc M\u1ef9, s\u1ef1 k\u1ebft h\u1ee3p c\u1ee7a Contactor, Overload, v\u00e0 C\u1ea7u dao b\u1ea3o v\u1ec7 \u0111\u1ed9ng c\u01a1 v\u1eabn \u0111\u1ea1i di\u1ec7n cho ph\u01b0\u01a1ng ph\u00e1p ph\u1ed5 bi\u1ebfn nh\u1ea5t \u0111\u1ec3 \u0111\u1ea1t \u0111\u01b0\u1ee3c \u0111i\u1ec1u khi\u1ec3n \u0111\u1ed9ng c\u01a1; \u0111i\u1ec1u n\u00e0y ch\u1ee7 y\u1ebfu l\u00e0 do NEC duy tr\u00ec y\u00eau c\u1ea7u v\u1ec1 thi\u1ebft b\u1ecb b\u1ea3o v\u1ec7 ng\u1eafn m\u1ea1ch v\u00e0 l\u1ed7i \u0111\u1ea5t cho nh\u00e1nh \u0111\u1ed9ng c\u01a1 nh\u01b0 m\u1ed9t thi\u1ebft b\u1ecb \u0111\u01b0\u1ee3c li\u1ec7t k\u00ea (\u0111\u01b0\u1ee3c c\u01a1 quan ph\u00ea duy\u1ec7t) khi \u0111\u01b0\u1ee3c s\u1eed d\u1ee5ng nh\u01b0 m\u1ed9t th\u00e0nh ph\u1ea7n ri\u00eang l\u1ebb trong m\u1ed9t b\u1ed9 kh\u1edfi \u0111\u1ed9ng.<\/p>\n

    Quy t\u1eafc 125% v\u00e0 Vai tr\u00f2 c\u1ee7a n\u00f3 trong B\u1ea3o v\u1ec7 \u0110\u1ed9ng c\u01a1<\/h2>\n

    Trong B\u1ed9 lu\u1eadt \u0110i\u1ec7n Qu\u1ed1c gia (NEC), b\u1ea3o v\u1ec7 qu\u00e1 t\u1ea3i n\u00ean \u0111\u01b0\u1ee3c k\u00edch th\u01b0\u1edbc kh\u00f4ng ch\u00ednh x\u00e1c cho c\u00e1c \u0111\u1ed9ng c\u01a1 c\u00f3 h\u1ec7 s\u1ed1 d\u1ecbch v\u1ee5 l\u1edbn h\u01a1n 1.15 \u1edf kh\u00f4ng qu\u00e1 125% c\u1ee7a t\u1ea3i \u0111\u1ea7y \u0111\u1ee7. M\u1eb7t kh\u00e1c, \u0111i\u1ec1u ch\u1ec9nh qu\u00e1 t\u1ea3i t\u1ed1i \u0111a tr\u00ean r\u01a1 le qu\u00e1 t\u1ea3i c\u1ee7a m\u1ed9t \u0111\u1ed9ng c\u01a1 c\u00f3 h\u1ec7 s\u1ed1 d\u1ecbch v\u1ee5 1.0 ho\u1eb7c s\u1ef1 gia t\u0103ng nhi\u1ec7t \u0111\u1ed9 40 \u0111\u1ed9 Celsius s\u1ebd \u1edf m\u1ee9c 115% c\u1ee7a t\u1ea3i \u0111\u1ea7y \u0111\u1ee7. M\u1ee5c \u0111\u00edch c\u1ee7a b\u00e0i vi\u1ebft n\u00e0y l\u00e0 cung c\u1ea5p b\u1ea3o v\u1ec7 qu\u00e1 t\u1ea3i cho \u0111\u1ed9ng c\u01a1 m\u00e0 kh\u00f4ng l\u00e0m r\u01a1 le qu\u00e1 t\u1ea3i ng\u1eaft d\u01b0\u1edbi c\u00e1c \u0111i\u1ec1u ki\u1ec7n ch\u1ea1y b\u00ecnh th\u01b0\u1eddng, nh\u01b0ng r\u01a1 le qu\u00e1 t\u1ea3i s\u1ebd ng\u1eaft tr\u01b0\u1edbc khi c\u00e1ch \u0111i\u1ec7n cu\u1ed9n d\u00e2y c\u1ee7a \u0111\u1ed9ng c\u01a1 \u0111\u1ea1t \u0111\u1ebfn nhi\u1ec7t \u0111\u1ed9 s\u1ebd r\u00fat ng\u1eafn tu\u1ed5i th\u1ecd c\u1ee7a \u0111\u1ed9ng c\u01a1. Quy t\u1eafc n\u00e0y ch\u1ec9 \u00e1p d\u1ee5ng cho c\u00e1c r\u01a1 le qu\u00e1 t\u1ea3i v\u00e0 kh\u00f4ng \u0111i\u1ec1u ch\u1ec9nh thi\u1ebft b\u1ecb ng\u1eafn m\u1ea1ch c\u1ee7a \u0111\u1ed9ng c\u01a1. C\u00e0i \u0111\u1eb7t c\u1ee7a m\u1ed9t trip t\u1eeb t\u00ednh tr\u00ean m\u1ed9t MCP cao h\u01a1n nhi\u1ec1u (th\u01b0\u1eddng t\u1eeb 700\u20131300% c\u1ee7a t\u1ea3i \u0111\u1ea7y \u0111\u1ee7) so v\u1edbi c\u00e0i \u0111\u1eb7t c\u1ee7a r\u01a1 le qu\u00e1 t\u1ea3i (125% c\u1ee7a t\u1ea3i \u0111\u1ea7y \u0111\u1ee7) theo \u0110i\u1ec1u 430 c\u1ee7a NEC. \u0110i\u1ec1u 430 thi\u1ebft l\u1eadp l\u01b0\u1ee3ng b\u1ea3o v\u1ec7 ng\u1eafn m\u1ea1ch t\u1ed1i \u0111a cho c\u00e1c c\u1ea7u dao ng\u1eaft t\u1ee9c th\u1eddi c\u00f3 th\u1ec3 \u0111\u01b0\u1ee3c s\u1eed d\u1ee5ng k\u1ebft h\u1ee3p v\u1edbi m\u1ed9t r\u01a1 le qu\u00e1 t\u1ea3i c\u00f3 \u0111\u1ecbnh m\u1ee9c 1300% c\u1ee7a t\u1ea3i \u0111\u1ea7y \u0111\u1ee7. Quy t\u1eafc 125% v\u00e0 c\u00e0i \u0111\u1eb7t cao li\u00ean quan \u0111\u1ebfn trip t\u1eeb t\u00ednh c\u1ee7a MCP h\u1ed7 tr\u1ee3 l\u1eabn nhau: r\u01a1 le qu\u00e1 t\u1ea3i b\u1ea3o v\u1ec7 ch\u1ed1ng l\u1ea1i thi\u1ec7t h\u1ea1i nhi\u1ec7t ch\u1eadm cho \u0111\u1ed9ng c\u01a1, trong khi MCP b\u1ea3o v\u1ec7 \u0111\u1ed9ng c\u01a1 ch\u1ed1ng l\u1ea1i d\u00f2ng l\u1ed7i nhanh. Kh\u00f4ng gi\u00e1 tr\u1ecb n\u00e0o trong s\u1ed1 n\u00e0y c\u00f3 th\u1ec3 \u0111\u01b0\u1ee3c ho\u00e1n \u0111\u1ed5i gi\u1eefa c\u00e1c thi\u1ebft b\u1ecb m\u00e0 kh\u00f4ng l\u00e0m v\u00f4 hi\u1ec7u h\u00f3a s\u1ef1 ph\u1ed1i h\u1ee3p s\u1ebd \u0111\u1ea3m b\u1ea3o r\u1eb1ng \u0111\u1ed9ng c\u01a1 ti\u1ebfp t\u1ee5c ho\u1ea1t \u0111\u1ed9ng an to\u00e0n.<\/p>\n

    \"B\u1ed9<\/p>\n

    B\u1ed9 B\u1ea3o V\u1ec7 M\u1ea1ch \u0110\u1ed9ng C\u01a1 c\u00f3 ph\u1ea3i l\u00e0 m\u1ed9t B\u1ed9 Ng\u1eaft M\u1ea1ch kh\u00f4ng?<\/h2>\n

    Khi c\u00e1c c\u00e2u h\u1ecfi v\u1ec1 d\u1ef1 \u00e1n l\u1eafp \u0111\u1eb7t ph\u00e1t sinh, ch\u00fang y\u00eau c\u1ea7u s\u1ef1 ph\u00e2n bi\u1ec7t gi\u1eefa c\u00e1c \u0111\u1eb7c \u0111i\u1ec3m v\u1eadt l\u00fd v\u00e0 ch\u1ee9c n\u0103ng t\u1ed5ng th\u1ec3 c\u0169ng nh\u01b0 lo\u1ea1i c\u1ea5u h\u00ecnh v\u00e0 s\u1ed1 m\u00f4 h\u00ecnh \u0111\u01b0\u1ee3c s\u1eed d\u1ee5ng cho c\u00e1c m\u1ee5c \u0111\u00edch x\u00e1c \u0111\u1ecbnh. V\u1ec1 h\u00ecnh th\u1ee9c, b\u1ed9 b\u1ea3o v\u1ec7 m\u1ea1ch \u0111\u00e3 \u0111\u01b0\u1ee3c s\u1eeda \u0111\u1ed5i (MCP) c\u00f3 c\u00f9ng v\u1ecf v\u00e0 c\u1ea5u h\u00ecnh c\u00f4ng t\u1eafc b\u1eadt\/t\u1eaft nh\u01b0 m\u1ed9t c\u1ea7u dao ng\u1eaft m\u1ea1ch d\u1ea1ng khu\u00f4n (MCC); tuy nhi\u00ean, v\u1ec1 ch\u1ee9c n\u0103ng, MCP l\u00e0 m\u1ed9t lo\u1ea1i c\u1ea7u dao ng\u1eaft m\u1ea1ch \u0111\u00e3 \u0111\u01b0\u1ee3c s\u1eeda \u0111\u1ed5i \u0111\u1ec3 lo\u1ea1i b\u1ecf thi\u1ebft b\u1ecb b\u1ea3o v\u1ec7 qu\u00e1 t\u1ea3i nhi\u1ec7t c\u1ee7a n\u00f3 v\u00e0 \u0111\u01b0\u1ee3c thay th\u1ebf b\u1eb1ng m\u1ed9t thi\u1ebft b\u1ecb trip t\u1eeb t\u00ednh \u0111i\u1ec1u ch\u1ec9nh. M\u1eb7c d\u00f9 m\u1ed9t s\u1ed1 MCP l\u00e0 s\u1ea3n ph\u1ea9m \u0111\u01b0\u1ee3c li\u1ec7t k\u00ea k\u00e9p \u0111\u00e1p \u1ee9ng UL 508 (\u0111\u1ec3 s\u1eed d\u1ee5ng trong b\u1ea3ng \u0111i\u1ec1u khi\u1ec3n \u0111i\u1ec1u khi\u1ec3n c\u00f4ng nghi\u1ec7p) v\u00e0 UL 489 (\u0111\u1ec3 \u0111\u01b0\u1ee3c s\u1eed d\u1ee5ng nh\u01b0 m\u1ed9t c\u1ea7u dao ng\u1eaft m\u1ea1ch d\u1ea1ng khu\u00f4n), MCP s\u1ebd th\u1ef1c hi\u1ec7n vai tr\u00f2 c\u1ee7a n\u00f3 nh\u01b0 l\u00e0 b\u1ed9 b\u1ea3o v\u1ec7 ng\u1eafn m\u1ea1ch cho m\u1ea1ch \u0111\u1ed9ng c\u01a1; tuy nhi\u00ean, ch\u00fang ph\u1ea3i lu\u00f4n \u0111\u01b0\u1ee3c s\u1eed d\u1ee5ng v\u1edbi c\u00e1c r\u01a1 le qu\u00e1 t\u1ea3i v\u00e0 c\u00e1c c\u00f4ng t\u1eafc th\u00edch h\u1ee3p. M\u1ed9t MCP kh\u00f4ng th\u1ec3 \u0111\u01b0\u1ee3c s\u1eed d\u1ee5ng tr\u00ean c\u00e1c m\u1ea1ch \u0111\u1ed9ng c\u01a1 tr\u1eeb khi theo h\u01b0\u1edbng d\u1eabn l\u1eafp \u0111\u1eb7t c\u1ee7a nh\u00e0 s\u1ea3n xu\u1ea5t v\u00e0 tu\u00e2n th\u1ee7 m\u00e3 th\u00edch h\u1ee3p; c\u00f3 m\u1ed9t s\u1ed1 tr\u01b0\u1eddng h\u1ee3p \u0111\u1eb7c bi\u1ec7t cho ph\u00e9p m\u1ed9t MCB b\u1ea3o v\u1ec7 m\u1ed9t m\u1ea1ch \u0111\u1ed9ng c\u01a1 nh\u1ecf (v\u00ed d\u1ee5: m\u1ed9t m\u1ea1ch \u0111\u1ed9ng c\u01a1 nh\u1ecf \u0111\u01b0\u1ee3c v\u1eadn h\u00e0nh b\u1edfi m\u1ed9t thi\u1ebft b\u1ecb ch\u1ea1y b\u1eb1ng pin). N\u1ebfu b\u1ea1n c\u1ea7n tr\u1ee3 gi\u00fap trong vi\u1ec7c k\u00edch th\u01b0\u1edbc m\u1ed9t c\u1ea7u dao cho b\u1ea5t k\u1ef3 \u1ee9ng d\u1ee5ng n\u00e0o, h\u01b0\u1edbng d\u1eabn c\u1ee7a ch\u00fang t\u00f4i v\u1ec1 <\/span>k\u00edch th\u01b0\u1edbc c\u1ea7u dao b\u1ea1n c\u1ea7n<\/a> gi\u1ea3i th\u00edch quy tr\u00ecnh t\u00ednh to\u00e1n cho c\u1ea3 t\u1ea3i chung v\u00e0 t\u1ea3i \u0111\u1ed9ng c\u01a1.<\/span><\/p>\n

    C\u00e1ch HUYU H\u1ed7 Tr\u1ee3 B\u1ea3o V\u1ec7 M\u1ea1ch \u0110\u1ed9ng C\u01a1 \u0110\u00fang C\u00e1ch<\/h2>\n

    HUYU cung c\u1ea5p m\u1ed9t lo\u1ea1t c\u00e1c thi\u1ebft b\u1ecb b\u1ea3o v\u1ec7 m\u1ea1ch ho\u00e0n ch\u1ec9nh \u0111\u01b0\u1ee3c s\u1eed d\u1ee5ng trong h\u1ec7 th\u1ed1ng \u0111i\u1ec1u khi\u1ec3n \u0111\u1ed9ng c\u01a1, bao g\u1ed3m c\u00e1c c\u1ea7u ch\u00ec d\u1ea1ng khu\u00f4n cho b\u1ea3o v\u1ec7 m\u1ea1ch c\u1ea5p v\u00e0 nh\u00e1nh; c\u00e1c c\u1ea7u ch\u00ec \u0111\u01b0\u1ee3c li\u1ec7t k\u00ea UL 489 \u0111\u00e1p \u1ee9ng y\u00eau c\u1ea7u d\u1ecbch v\u1ee5 \u0111\u1ea7u v\u00e0o v\u00e0 nh\u00e1nh; v\u00e0 nhi\u1ec1u \u0111\u1eb7c t\u00ednh ng\u1eaft \u0111\u1ec3 cung c\u1ea5p cho c\u00e1c k\u1ef9 s\u01b0 s\u1ef1 l\u1ef1a ch\u1ecdn \u0111\u1ec3 ph\u00f9 h\u1ee3p thi\u1ebft b\u1ecb b\u1ea3o v\u1ec7 v\u1edbi t\u1ea3i \u2014 ch\u1eb3ng h\u1ea1n nh\u01b0 c\u00e1c ng\u00e2n h\u00e0ng s\u01b0\u1edfi \u1ea5m \u0111i\u1ec7n tr\u1edf ho\u1eb7c m\u1ea1ch b\u1ea3ng chi\u1ebfu s\u00e1ng, ho\u1eb7c \u0111\u1ed9ng c\u01a1 c\u00f3 d\u00f2ng kh\u1edfi \u0111\u1ed9ng cao. HUYU c\u00f3 c\u00e1c c\u1ea7u ch\u00ec mini \u0111\u1ec3 cung c\u1ea5p b\u1ea3o v\u1ec7 m\u1ea1ch cho c\u00e1c \u1ee9ng d\u1ee5ng T\u1ea3i Chung \u0111\u1ebfn c\u00e1c c\u1ea7u ch\u00ec d\u1ea1ng khu\u00f4n c\u00f3 c\u00e1c ch\u1ec9 s\u1ed1 ng\u1eaft v\u00e0 \u0111\u01b0\u1eddng cong ng\u1eaft \u0111i\u1ec1u ch\u1ec9nh \u0111\u01b0\u1ee3c thi\u1ebft k\u1ebf \u0111\u1ec3 b\u1ea3o v\u1ec7 c\u00e1c m\u1ea1ch \u0111\u1ed9ng c\u01a1 c\u00f4ng nghi\u1ec7p. N\u1ebfu b\u1ea1n ch\u1ecdn m\u1ed9t nh\u00e0 s\u1ea3n xu\u1ea5t cung c\u1ea5p t\u00e0i li\u1ec7u ki\u1ec3m tra \u0111\u1ea7y \u0111\u1ee7 v\u00e0 c\u00e1c \u0111\u1eb7c t\u00ednh ng\u1eaft \u0111\u01b0\u1ee3c ghi nh\u00e3n r\u00f5 r\u00e0ng, b\u1ea1n s\u1ebd lo\u1ea1i b\u1ecf s\u1ef1 kh\u00f4ng ch\u1eafc ch\u1eafn c\u1ee7a k\u1ecbch b\u1ea3n nh\u00e0 m\u00e1y ch\u1ebf bi\u1ebfn th\u1ef1c ph\u1ea9m \u2014 s\u1ef1 suy gi\u1ea3m ch\u1eadm v\u00e0 t\u1ed1n k\u00e9m c\u1ee7a m\u1ed9t \u0111\u1ed9ng c\u01a1 ch\u01b0a bao gi\u1edd \u0111\u01b0\u1ee3c b\u1ea3o v\u1ec7 \u0111\u00fang c\u00e1ch.<\/p>\n

    C\u00e2u h\u1ecfi th\u01b0\u1eddng g\u1eb7p<\/h2>\n

    M\u1ed9t MCP th\u01b0\u1eddng tr\u00f4ng gi\u1ed1ng nh\u01b0 m\u1ed9t c\u1ea7u dao v\u1ecf \u0111\u00fac \u2013 n\u00f3 v\u1eeba v\u1eb7n v\u00e0o m\u1ed9t b\u1ea3ng \u0111i\u1ec1u khi\u1ec3n ho\u1eb7c trung t\u00e2m \u0111i\u1ec1u khi\u1ec3n \u0111\u1ed9ng c\u01a1 v\u00e0 n\u00f3 c\u00f3 c\u00f9ng lo\u1ea1i c\u00f4ng t\u1eafc b\u1eadt\/t\u1eaft.<\/h3>\n

    M\u1ed9t thi\u1ebft b\u1ecb b\u1ea3o v\u1ec7 m\u1ea1ch \u0111\u1ed9ng c\u01a1 (c\u00f2n g\u1ecdi l\u00e0 MCP) l\u00e0 m\u1ed9t h\u00ecnh th\u1ee9c b\u1ea3o v\u1ec7 \u0111i\u1ec7n t\u1eed ch\u1ed1ng l\u1ea1i s\u1ef1 c\u1ed1 m\u1ea1ch \u0111\u1ed9ng c\u01a1. M\u1ed9t MCP kh\u00e1c v\u1edbi m\u1ed9t c\u1ea7u ch\u00ec ti\u00eau chu\u1ea9n v\u00ec n\u00f3 ch\u1ec9 cung c\u1ea5p b\u1ea3o v\u1ec7 ng\u1eafn m\u1ea1ch th\u00f4ng qua t\u1eeb t\u00ednh \u2014 do \u0111\u00f3 n\u00f3 kh\u00f4ng bao g\u1ed3m m\u1ed9t thi\u1ebft b\u1ecb qu\u00e1 t\u1ea3i nhi\u1ec7t \u0111\u1ec3 b\u1ea3o v\u1ec7 m\u1ea1ch ch\u1ed1ng l\u1ea1i qu\u00e1 t\u1ea3i nhi\u1ec7t. N\u00f3 c\u0169ng \u0111\u01b0\u1ee3c s\u1eed d\u1ee5ng c\u00f9ng v\u1edbi m\u1ed9t r\u01a1 le qu\u00e1 t\u1ea3i ri\u00eang bi\u1ec7t, c\u00e1c ti\u1ebfp \u0111i\u1ec3m, v\u00e0 \u0111\u00f4i khi c\u0169ng nh\u01b0 m\u1ed9t s\u1ea3n ph\u1ea9m \u0111\u01b0\u1ee3c li\u1ec7t k\u00ea k\u00e9p cho UL998 v\u00e0 UL948.<\/p>\n

    V\u00ec l\u00fd do n\u00e0y, m\u1ed9t MCP \u0111\u00e1p \u1ee9ng c\u00e1c y\u00eau c\u1ea7u \u0111\u1ec3 tr\u1edf th\u00e0nh ph\u01b0\u01a1ng ti\u1ec7n ng\u1eaft k\u1ebft n\u1ed1i v\u00e0 b\u1ea3o v\u1ec7 ng\u1eafn m\u1ea1ch t\u1eeb m\u1ed9t m\u1ea1ch \u0111\u1ed9ng c\u01a1 khi n\u00f3 \u0111\u01b0\u1ee3c s\u1eed d\u1ee5ng c\u00f9ng v\u1edbi m\u1ed9t r\u01a1 le qu\u00e1 t\u1ea3i.<\/h3>\n

    Kh\u00f4ng, \u201cb\u1ea3o v\u1ec7 m\u1ea1ch\u201d c\u00f3 ngh\u0129a l\u00e0 m\u1ed9t lo\u1ea1t c\u00e1c thi\u1ebft b\u1ecb \u0111i\u1ec7n kh\u00e1c nhau nh\u01b0 c\u1ea7u ch\u00ec, c\u00e1c thi\u1ebft b\u1ecb b\u1ea3o v\u1ec7 b\u1ed5 sung, v\u00e0 c\u00e1c thi\u1ebft b\u1ecb b\u1ea3o v\u1ec7 m\u1ea1ch \u0111\u1ed9ng c\u01a1; tuy nhi\u00ean, m\u1ed9t c\u1ea7u ch\u00ec l\u00e0 m\u1ed9t lo\u1ea1i thi\u1ebft b\u1ecb \u0111i\u1ec7n th\u1ef1c s\u1ef1 c\u00f3 th\u1ec3 \u0111\u01b0\u1ee3c \u0111\u1eb7t l\u1ea1i b\u1edfi ng\u01b0\u1eddi s\u1eed d\u1ee5ng v\u00e0 b\u1ea3o v\u1ec7 ch\u1ed1ng l\u1ea1i c\u1ea3 qu\u00e1 d\u00f2ng, ho\u1eb7c qu\u00e1 t\u1ea3i, v\u00e0 ng\u1eafn m\u1ea1ch. M\u1ed9t MCP c\u0169ng l\u00e0 m\u1ed9t v\u00ed d\u1ee5 v\u1ec1 m\u1ed9t thi\u1ebft b\u1ecb \u0111i\u1ec7n l\u00e0 m\u1ed9t lo\u1ea1i b\u1ea3o v\u1ec7 m\u1ea1ch; tuy nhi\u00ean, ch\u1ee9c n\u0103ng duy nh\u1ea5t m\u00e0 n\u00f3 th\u1ef1c hi\u1ec7n l\u00e0 b\u1ea3o v\u1ec7 kh\u1ecfi ng\u1eafn m\u1ea1ch v\u00e0 n\u00f3 \u0111\u01b0\u1ee3c thi\u1ebft k\u1ebf ch\u1ec9 \u0111\u1ec3 s\u1eed d\u1ee5ng v\u1edbi t\u1ea3i \u0111\u1ed9ng c\u01a1.<\/p>\n

    gi\u1ea3i th\u00edch c\u00e1c th\u1eed nghi\u1ec7m v\u00e0 ch\u1ee9ng nh\u1eadn ph\u00e2n bi\u1ec7t m\u1ed9t c\u1ea7u dao \u0111\u00e3 \u0111\u01b0\u1ee3c li\u1ec7t k\u00ea v\u1edbi m\u1ed9t th\u00e0nh ph\u1ea7n kh\u00f4ng \u0111\u01b0\u1ee3c li\u1ec7t k\u00ea.<\/h3>\n

    M\u1ed9t MCB truy\u1ec1n th\u1ed1ng c\u00f3 v\u1ecb tr\u00ed ng\u1eaft t\u1eeb t\u00ednh \u0111\u00e3 \u0111\u01b0\u1ee3c x\u00e1c \u0111\u1ecbnh tr\u01b0\u1edbc m\u00e0 th\u01b0\u1eddng t\u01b0\u01a1ng \u1ee9ng v\u1edbi d\u00f2ng kh\u1edfi \u0111\u1ed9ng c\u1ee7a m\u1ed9t \u0111\u1ed9ng c\u01a1 do \u0111\u00f3 c\u0169ng g\u00e2y ra ng\u1eaft kh\u00f4ng mong mu\u1ed1n. Ngo\u00e0i ra, y\u1ebfu t\u1ed1 nhi\u1ec7t c\u1ee7a MCB c\u0169ng kh\u00f4ng \u0111\u01b0\u1ee3c hi\u1ec7u ch\u1ec9nh \u0111\u00fang c\u00e1ch \u0111\u1ec3 \u0111\u00e1p \u1ee9ng \u0111\u01b0\u1eddng cong h\u01b0 h\u1ecfng nhi\u1ec7t c\u1ee5 th\u1ec3 c\u1ee7a t\u1eebng \u0111\u1ed9ng c\u01a1. MCP ho\u1eb7c MPCB v\u1edbi c\u00e1c gi\u1edbi h\u1ea1n ng\u1eaft \u0111i\u1ec1u ch\u1ec9nh c\u1ee7a ch\u00fang lo\u1ea1i b\u1ecf c\u1ea3 hai s\u1ef1 kh\u00f4ng kh\u1edbp n\u00e0y trong khi cung c\u1ea5p b\u1ea3o v\u1ec7 \u0111\u00e1ng tin c\u1eady kh\u1ecfi c\u00e1c ng\u1eaft kh\u00f4ng c\u1ea7n thi\u1ebft.<\/p>\n

    Quy t\u1eafc 125% trong \u0111i\u1ec7n l\u00e0 g\u00ec?<\/h3>\n

    Theo \u0110i\u1ec1u 430.32 c\u1ee7a NEC, quy t\u1eafc 125% quy \u0111\u1ecbnh r\u1eb1ng \u0111\u1ed1i v\u1edbi c\u00e1c \u0111\u1ed9ng c\u01a1 c\u00f3 h\u1ec7 s\u1ed1 d\u1ecbch v\u1ee5 l\u1edbn h\u01a1n ho\u1eb7c b\u1eb1ng 1.15, b\u1ea3o v\u1ec7 qu\u00e1 t\u1ea3i ph\u1ea3i \u0111\u01b0\u1ee3c \u0111\u1ecbnh m\u1ee9c kh\u00f4ng cao h\u01a1n 125% c\u1ee7a d\u00f2ng \u0111i\u1ec7n t\u1ea3i \u0111\u1ea7y \u0111\u1ee7. \u0110i\u1ec1u n\u00e0y ch\u1ec9 li\u00ean quan \u0111\u1ebfn c\u00e1c qu\u00e1 t\u1ea3i v\u00e0 kh\u00f4ng li\u00ean quan \u0111\u1ebfn b\u1ea3o v\u1ec7 ng\u1eafn m\u1ea1ch, v\u00ec n\u00f3 \u0111\u01b0\u1ee3c thi\u1ebft k\u1ebf \u0111\u1ec3 b\u1ea3o v\u1ec7 \u0111\u1ed9ng c\u01a1 kh\u1ecfi qu\u00e1 t\u1ea3i nhi\u1ec7t k\u00e9o d\u00e0i do s\u1eed d\u1ee5ng trong c\u00e1c \u0111i\u1ec1u ki\u1ec7n ho\u1ea1t \u0111\u1ed9ng b\u00ecnh th\u01b0\u1eddng tr\u00ean m\u1ee9c trung b\u00ecnh.<\/p>\n

    The \u2192 C\u00e1i s\u1ef1 kh\u00e1c bi\u1ec7t gi\u1eefa m\u1ed9t c\u1ea7u ch\u00ec ti\u00eau chu\u1ea9n<\/strong> v\u00e0 m\u1ed9t b\u1ed9 b\u1ea3o v\u1ec7 m\u1ea1ch \u0111\u1ed9ng c\u01a1 kh\u00f4ng ch\u1ec9 \u0111\u01a1n thu\u1ea7n l\u00e0 m\u1ed9t k\u1ef9 thu\u1eadt. M\u1ed9t b\u1ed9 b\u1ea3o v\u1ec7 m\u1ea1ch \u0111\u1ed9ng c\u01a1 (MCP) s\u1ebd cung c\u1ea5p nhi\u1ec1u n\u0103m kh\u1edfi \u0111\u1ed9ng \u0111\u00e1ng tin c\u1eady v\u00e0 kh\u00f4ng g\u1eb7p s\u1ef1 c\u1ed1. M\u1ed9t b\u1ed9 ng\u1eaft m\u1ea1ch ti\u00eau chu\u1ea9n, m\u1eb7t kh\u00e1c, s\u1ebd ho\u1eb7c l\u00e0 ng\u1eaft m\u1ed7i l\u1ea7n \u0111\u1ed9ng c\u01a1 c\u1ed1 g\u1eafng kh\u1edfi \u0111\u1ed9ng ho\u1eb7c s\u1ebd \u00e2m th\u1ea7m th\u1ea5t b\u1ea1i khi \u0111\u1ed9ng c\u01a1 qu\u00e1 nhi\u1ec7t do b\u1ea3o v\u1ec7 qu\u00e1 t\u1ea3i kh\u00f4ng \u0111\u1ee7. B\u1eb1ng c\u00e1ch cung c\u1ea5p m\u1ed9t b\u1ed9 ng\u1eaft t\u1eeb t\u00ednh \u0111i\u1ec1u ch\u1ec9nh k\u1ebft h\u1ee3p v\u1edbi m\u1ed9t r\u01a1 le qu\u00e1 t\u1ea3i c\u00f3 k\u00edch th\u01b0\u1edbc ph\u00f9 h\u1ee3p, MCP \u0111\u00e3 \u0111\u01b0\u1ee3c x\u00e1c nh\u1eadn v\u00e0 t\u00e0i li\u1ec7u b\u1edfi B\u1ed9 lu\u1eadt \u0110i\u1ec7n Qu\u1ed1c gia (NEC) c\u0169ng nh\u01b0 h\u00e0ng th\u1eadp k\u1ef7 k\u1ef9 thu\u1eadt b\u1ea3o v\u1ec7 \u0111\u1ed9ng c\u01a1 chuy\u00ean d\u1ee5ng nh\u01b0 l\u00e0 gi\u1ea3i ph\u00e1p \u0111\u00fang \u0111\u1eafn \u0111\u1ec3 b\u1ea3o v\u1ec7 \u0111\u1ed9ng c\u01a1 kh\u1ecfi h\u01b0 h\u1ecfng. M\u1ed9t b\u1ed9 ng\u1eaft m\u1ea1ch ti\u00eau chu\u1ea9n (MCB), trong khi h\u1eefu \u00edch cho vi\u1ec7c b\u1ea3o v\u1ec7 t\u1ea3i chi\u1ebfu s\u00e1ng v\u00e0 s\u01b0\u1edfi \u1ea5m, l\u00e0 m\u1ed9t \u1ee9ng d\u1ee5ng kh\u00f4ng \u0111\u00fang cho m\u1ee5c \u0111\u00edch n\u00e0y. T\u1ea1i HUYU, ch\u00fang t\u00f4i cung c\u1ea5p t\u1ea5t c\u1ea3 c\u00e1c lo\u1ea1i thi\u1ebft b\u1ecb b\u1ea3o v\u1ec7 \u0111\u01b0\u1ee3c \u0111\u1ecbnh m\u1ee9c \u0111\u00fang theo lo\u1ea1i t\u1ea3i \u0111\u1ec3 \u0111\u1ea3m b\u1ea3o r\u1eb1ng s\u1ef1 k\u1ebft h\u1ee3p \u0111\u00fang \u0111\u1eafn gi\u1eefa b\u1ea3o v\u1ec7 v\u00e0 t\u1ea3i l\u00e0 n\u1ec1n t\u1ea3ng c\u1ee7a m\u1ed9t h\u1ec7 th\u1ed1ng \u0111i\u1ec7n an to\u00e0n, \u0111\u00e1ng tin c\u1eady v\u00e0 tu\u00e2n th\u1ee7 quy \u0111\u1ecbnh.<\/p>","protected":false},"excerpt":{"rendered":"

    There are many occasions that illustrate how different the load characteristics of a motor are compared with those of a heater or lighting circuit. One such example is a case that occurred a few years ago, when a maintenance electrician was called to a food processing facility due to an unexpected production line shutdown. The […]<\/p>\n","protected":false},"author":1,"featured_media":2728,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_gspb_post_css":"","footnotes":""},"categories":[1],"tags":[],"class_list":["post-2726","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\/2726","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=2726"}],"version-history":[{"count":1,"href":"https:\/\/huyuglobal.com\/vi\/wp-json\/wp\/v2\/posts\/2726\/revisions"}],"predecessor-version":[{"id":2733,"href":"https:\/\/huyuglobal.com\/vi\/wp-json\/wp\/v2\/posts\/2726\/revisions\/2733"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/huyuglobal.com\/vi\/wp-json\/wp\/v2\/media\/2728"}],"wp:attachment":[{"href":"https:\/\/huyuglobal.com\/vi\/wp-json\/wp\/v2\/media?parent=2726"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/huyuglobal.com\/vi\/wp-json\/wp\/v2\/categories?post=2726"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/huyuglobal.com\/vi\/wp-json\/wp\/v2\/tags?post=2726"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}