{"id":4244,"date":"2026-09-25T00:00:00","date_gmt":"2026-09-25T00:00:00","guid":{"rendered":"https:\/\/chac-electric.com\/?p=4244"},"modified":"2026-09-18T08:06:06","modified_gmt":"2026-09-18T08:06:06","slug":"ung-dung-va-lua-chon-cac-loai-duong-cong-ngat-mach-kieu-b","status":"publish","type":"post","link":"https:\/\/chac-electric.com\/vi\/blog\/what-is-type-b-mcb-tripping-curve-applications-and-selection\/","title":{"rendered":"Lo\u1ea1i MCB lo\u1ea1i B l\u00e0 g\u00ec? \u0110\u01b0\u1eddng cong ng\u1eaft \u0111i\u1ec7n, c\u00e1c \u1ee9ng d\u1ee5ng v\u00e0 l\u1ef1a ch\u1ecdn"},"content":{"rendered":"

Khi m\u1ed9t vai tr\u00f2 trong d\u1ef1 \u00e1n g\u1eb7p v\u1ea5n \u0111\u1ec1 l\u1ef1a ch\u1ecdn, s\u1ef1 th\u1ea5t b\u1ea1i r\u00f5 r\u00e0ng th\u01b0\u1eddng xu\u1ea5t hi\u1ec7n tr\u01b0\u1edbc khi nguy\u00ean nh\u00e2n th\u1ef1c s\u1ef1 \u0111\u01b0\u1ee3c hi\u1ec3u r\u00f5. Nina, m\u1ed9t k\u1ef9 s\u01b0 d\u1ecbch v\u1ee5 x\u00e2y d\u1ef1ng t\u1ea1i Warsaw, \u0111\u00e3 thay \u0111\u1ed5i b\u1ea3ng \u0111\u00e8n t\u1eeb d\u1ea1ng \u0111\u01b0\u1eddng cong B sang thi\u1ebft b\u1ecb c\u00f3 ng\u01b0\u1ee1ng cao h\u01a1n \u0111\u1ec3 ng\u0103n ch\u1eb7n c\u00e1c s\u1ef1 c\u1ed1 \u0111\u00e8n nh\u1ea5p nh\u00e1y. C\u00e1c \u0111\u00e8n \u0111\u00e3 kh\u00f4ng c\u00f2n nh\u1ea5p nh\u00e1y n\u1eefa, nh\u01b0ng d\u00f2ng \u0111i\u1ec7n l\u1ed7i ti\u1ec1m \u1ea9n ch\u01b0a bao gi\u1edd \u0111\u01b0\u1ee3c ki\u1ec3m tra. Gi\u1ea3i ph\u00e1p t\u1ed1t h\u01a1n l\u00e0 hi\u1ec3u r\u00f5 \u0111\u01b0\u1eddng cong B, chi\u1ec1u d\u00e0i c\u00e1p v\u00e0 tr\u1edf kh\u00e1ng v\u00f2ng l\u1eb7p l\u1ed7i.<\/p>\n

T\u00f3m t\u1eaft:<\/strong> Thi\u1ebft b\u1ecb MCB lo\u1ea1i B c\u00f3 ph\u1ea1m vi ho\u1ea1t \u0111\u1ed9ng t\u1eeb t\u00ednh t\u1ee9c th\u1eddi d\u00e0nh cho c\u00e1c m\u1ea1ch c\u00f3 d\u00f2ng \u0111i\u1ec7n v\u00e0o t\u01b0\u01a1ng \u0111\u1ed1i th\u1ea5p, th\u01b0\u1eddng d\u00f9ng \u0111\u1ec3 cung c\u1ea5p \u0111i\u1ec7n cho \u0111\u00e8n v\u00e0 c\u00e1c thi\u1ebft b\u1ecb c\u00f4ng su\u1ea5t ti\u00eau d\u00f9ng chung. C\u00e1c ng\u01b0\u1ee1ng ch\u00ednh x\u00e1c ph\u1ee5 thu\u1ed9c v\u00e0o ti\u00eau chu\u1ea9n v\u00e0 nh\u00e0 s\u1ea3n xu\u1ea5t \u00e1p d\u1ee5ng; kh\u00f4ng n\u00ean coi \u201cB\u201d l\u00e0 d\u00f2ng \u0111i\u1ec7n kh\u1edfi \u0111\u1ed9ng chung. X\u00e1c nh\u1eadn t\u00ecnh tr\u1ea1ng v\u00f2ng r\u00f2 r\u1ec9, chi\u1ec1u d\u00e0i c\u00e1p v\u00e0 s\u1ef1 ph\u1ed1i h\u1ee3p. B\u00e0i vi\u1ebft n\u00e0y d\u1ef1a tr\u00ean b\u1eb1ng ch\u1ee9ng \u0111\u1ec3 \u0111\u01b0a ra quy\u1ebft \u0111\u1ecbnh v\u00e0 t\u00e1ch bi\u1ec7t kh\u1ea3 n\u0103ng c\u1ee7a s\u1ea3n ph\u1ea9m v\u1edbi tr\u00e1ch nhi\u1ec7m l\u1eafp \u0111\u1eb7t.<\/p>\n

\"\u1ee8ng<\/p>\n

\u00dd ngh\u0129a v\u00e0 gi\u1edbi h\u1ea1n c\u1ee7a \u0111\u01b0\u1eddng cong B<\/h2>\n

C\u00e2u tr\u1ea3 l\u1eddi \u0111\u00fang b\u1eaft \u0111\u1ea7u t\u1eeb ranh gi\u1edbi \u1ee9ng d\u1ee5ng. H\u00e3y x\u00e1c \u0111\u1ecbnh ngu\u1ed3n, t\u1ea3i, d\u00e2y d\u1eabn, m\u1ee9c \u0111\u1ed9 s\u1ef1 c\u1ed1 v\u00e0 m\u00f4i tr\u01b0\u1eddng v\u1eadn h\u00e0nh tr\u01b0\u1edbc khi so s\u00e1nh c\u00e1c catalogue. M\u1ed9t thi\u1ebft b\u1ecb tr\u00f4ng c\u00f3 v\u1ebb ph\u00f9 h\u1ee3p v\u1ec1 \u0111\u1ecbnh m\u1ee9c d\u00f2ng \u0111i\u1ec7n v\u1eabn c\u00f3 th\u1ec3 h\u1ecfng v\u1ec1 kh\u1ea3 n\u0103ng ch\u1ecbu h\u1ed3 quang, t\u00ednh ch\u1ecdn l\u1ecdc, nhi\u1ec7t \u0111\u1ed9 ho\u1eb7c ph\u01b0\u01a1ng ph\u00e1p l\u1eafp \u0111\u1eb7t. H\u00e3y s\u1eed d\u1ee5ng \u0111\u01b0\u1eddng cong th\u1eddi gian-d\u00f2ng \u0111i\u1ec7n c\u1ee7a nh\u00e0 s\u1ea3n xu\u1ea5t v\u00e0 ti\u00eau chu\u1ea9n \u0111i d\u00e2y \u0111\u01b0\u1ee3c \u00e1p d\u1ee5ng l\u00e0m ng\u00f4n ng\u1eef chung gi\u1eefa thi\u1ebft k\u1ebf, mua s\u1eafm v\u00e0 ch\u1ea1y th\u1eed.<\/p>\n

L\u1eadp t\u00e0i li\u1ec7u v\u1ec1 c\u00e1c gi\u1ea3 \u0111\u1ecbnh v\u00e0 ki\u1ec3m tra ch\u00fang t\u1ea1i t\u1ee7 \u0111i\u1ec7n. V\u00ed d\u1ee5, m\u1ed9t nghi\u00ean c\u1ee9u v\u1ec1 b\u1ea3o v\u1ec7 c\u1ea7n n\u00eau r\u00f5 d\u00f2ng \u0111i\u1ec7n ng\u1eafn m\u1ea1ch d\u1ef1 ki\u1ebfn, d\u00f2ng \u0111i\u1ec7n kh\u1edfi \u0111\u1ed9ng (inrush) d\u1ef1 ki\u1ebfn, kh\u1ea3 n\u0103ng mang d\u00f2ng c\u1ee7a d\u00e2y d\u1eabn v\u00e0 th\u1eddi gian c\u1eaft y\u00eau c\u1ea7u. C\u00e1c ph\u01b0\u01a1ng ph\u00e1p c\u00f3 t\u00ean g\u1ecdi c\u1ee5 th\u1ec3 nh\u01b0 th\u1eed nghi\u1ec7m ti\u00eam d\u00f2ng s\u01a1 c\u1ea5p, th\u1eed nghi\u1ec7m \u0111i\u1ec7n tr\u1edf c\u00e1ch \u0111i\u1ec7n ho\u1eb7c nghi\u00ean c\u1ee9u ph\u1ed1i h\u1ee3p s\u1ebd h\u1eefu \u00edch h\u01a1n so v\u1edbi m\u1ed9t tuy\u00ean b\u1ed1 chung chung r\u1eb1ng m\u1ed9t s\u1ea3n ph\u1ea9m \u0111\u1ea1t \u201cc\u1ea5p \u0111\u1ed9 c\u00f4ng nghi\u1ec7p.\u201d<\/p>\n

N\u1ebfu c\u00e2u tr\u1ea3 l\u1eddi thay \u0111\u1ed5i theo th\u1ecb tr\u01b0\u1eddng \u0111\u00edch, h\u1ec7 th\u1ed1ng \u0111i\u1ec7n \u00e1p ho\u1eb7c lo\u1ea1i \u1ee9ng d\u1ee5ng, h\u00e3y n\u00eau gi\u1ea3 \u0111\u1ecbnh \u0111\u00f3 trong th\u00f4ng s\u1ed1 k\u1ef9 thu\u1eadt v\u00e0 nh\u1eadn \u0111\u01b0\u1ee3c x\u00e1c nh\u1eadn b\u1eb1ng v\u0103n b\u1ea3n tr\u01b0\u1edbc khi ph\u00e1t h\u00e0nh.<\/p>\n

S\u1eed d\u1ee5ng trong chi\u1ebfu s\u00e1ng v\u00e0 t\u1ea3i tr\u1ecdng chung<\/h2>\n

C\u00e2u tr\u1ea3 l\u1eddi \u0111\u00fang b\u1eaft \u0111\u1ea7u t\u1eeb ranh gi\u1edbi \u1ee9ng d\u1ee5ng. H\u00e3y x\u00e1c \u0111\u1ecbnh ngu\u1ed3n, t\u1ea3i, d\u00e2y d\u1eabn, m\u1ee9c \u0111\u1ed9 s\u1ef1 c\u1ed1 v\u00e0 m\u00f4i tr\u01b0\u1eddng v\u1eadn h\u00e0nh tr\u01b0\u1edbc khi so s\u00e1nh c\u00e1c catalogue. M\u1ed9t thi\u1ebft b\u1ecb tr\u00f4ng c\u00f3 v\u1ebb ph\u00f9 h\u1ee3p v\u1ec1 \u0111\u1ecbnh m\u1ee9c d\u00f2ng \u0111i\u1ec7n v\u1eabn c\u00f3 th\u1ec3 h\u1ecfng v\u1ec1 kh\u1ea3 n\u0103ng ch\u1ecbu h\u1ed3 quang, t\u00ednh ch\u1ecdn l\u1ecdc, nhi\u1ec7t \u0111\u1ed9 ho\u1eb7c ph\u01b0\u01a1ng ph\u00e1p l\u1eafp \u0111\u1eb7t. H\u00e3y s\u1eed d\u1ee5ng \u0111\u01b0\u1eddng cong th\u1eddi gian-d\u00f2ng \u0111i\u1ec7n c\u1ee7a nh\u00e0 s\u1ea3n xu\u1ea5t v\u00e0 ti\u00eau chu\u1ea9n \u0111i d\u00e2y \u0111\u01b0\u1ee3c \u00e1p d\u1ee5ng l\u00e0m ng\u00f4n ng\u1eef chung gi\u1eefa thi\u1ebft k\u1ebf, mua s\u1eafm v\u00e0 ch\u1ea1y th\u1eed.<\/p>\n

L\u1eadp t\u00e0i li\u1ec7u v\u1ec1 c\u00e1c gi\u1ea3 \u0111\u1ecbnh v\u00e0 ki\u1ec3m tra ch\u00fang t\u1ea1i t\u1ee7 \u0111i\u1ec7n. V\u00ed d\u1ee5, m\u1ed9t nghi\u00ean c\u1ee9u v\u1ec1 b\u1ea3o v\u1ec7 c\u1ea7n n\u00eau r\u00f5 d\u00f2ng \u0111i\u1ec7n ng\u1eafn m\u1ea1ch d\u1ef1 ki\u1ebfn, d\u00f2ng \u0111i\u1ec7n kh\u1edfi \u0111\u1ed9ng (inrush) d\u1ef1 ki\u1ebfn, kh\u1ea3 n\u0103ng mang d\u00f2ng c\u1ee7a d\u00e2y d\u1eabn v\u00e0 th\u1eddi gian c\u1eaft y\u00eau c\u1ea7u. C\u00e1c ph\u01b0\u01a1ng ph\u00e1p c\u00f3 t\u00ean g\u1ecdi c\u1ee5 th\u1ec3 nh\u01b0 th\u1eed nghi\u1ec7m ti\u00eam d\u00f2ng s\u01a1 c\u1ea5p, th\u1eed nghi\u1ec7m \u0111i\u1ec7n tr\u1edf c\u00e1ch \u0111i\u1ec7n ho\u1eb7c nghi\u00ean c\u1ee9u ph\u1ed1i h\u1ee3p s\u1ebd h\u1eefu \u00edch h\u01a1n so v\u1edbi m\u1ed9t tuy\u00ean b\u1ed1 chung chung r\u1eb1ng m\u1ed9t s\u1ea3n ph\u1ea9m \u0111\u1ea1t \u201cc\u1ea5p \u0111\u1ed9 c\u00f4ng nghi\u1ec7p.\u201d<\/p>\n

N\u1ebfu c\u00e2u tr\u1ea3 l\u1eddi thay \u0111\u1ed5i theo th\u1ecb tr\u01b0\u1eddng \u0111\u00edch, h\u1ec7 th\u1ed1ng \u0111i\u1ec7n \u00e1p ho\u1eb7c lo\u1ea1i \u1ee9ng d\u1ee5ng, h\u00e3y n\u00eau gi\u1ea3 \u0111\u1ecbnh \u0111\u00f3 trong th\u00f4ng s\u1ed1 k\u1ef9 thu\u1eadt v\u00e0 nh\u1eadn \u0111\u01b0\u1ee3c x\u00e1c nh\u1eadn b\u1eb1ng v\u0103n b\u1ea3n tr\u01b0\u1edbc khi ph\u00e1t h\u00e0nh.<\/p>\n

Nh\u1eefng h\u1ea1n ch\u1ebf khi l\u1ef1a ch\u1ecdn v\u00e0 x\u00e1c minh<\/h2>\n

C\u00e2u tr\u1ea3 l\u1eddi \u0111\u00fang b\u1eaft \u0111\u1ea7u t\u1eeb ranh gi\u1edbi \u1ee9ng d\u1ee5ng. H\u00e3y x\u00e1c \u0111\u1ecbnh ngu\u1ed3n, t\u1ea3i, d\u00e2y d\u1eabn, m\u1ee9c \u0111\u1ed9 s\u1ef1 c\u1ed1 v\u00e0 m\u00f4i tr\u01b0\u1eddng v\u1eadn h\u00e0nh tr\u01b0\u1edbc khi so s\u00e1nh c\u00e1c catalogue. M\u1ed9t thi\u1ebft b\u1ecb tr\u00f4ng c\u00f3 v\u1ebb ph\u00f9 h\u1ee3p v\u1ec1 \u0111\u1ecbnh m\u1ee9c d\u00f2ng \u0111i\u1ec7n v\u1eabn c\u00f3 th\u1ec3 h\u1ecfng v\u1ec1 kh\u1ea3 n\u0103ng ch\u1ecbu h\u1ed3 quang, t\u00ednh ch\u1ecdn l\u1ecdc, nhi\u1ec7t \u0111\u1ed9 ho\u1eb7c ph\u01b0\u01a1ng ph\u00e1p l\u1eafp \u0111\u1eb7t. H\u00e3y s\u1eed d\u1ee5ng \u0111\u01b0\u1eddng cong th\u1eddi gian-d\u00f2ng \u0111i\u1ec7n c\u1ee7a nh\u00e0 s\u1ea3n xu\u1ea5t v\u00e0 ti\u00eau chu\u1ea9n \u0111i d\u00e2y \u0111\u01b0\u1ee3c \u00e1p d\u1ee5ng l\u00e0m ng\u00f4n ng\u1eef chung gi\u1eefa thi\u1ebft k\u1ebf, mua s\u1eafm v\u00e0 ch\u1ea1y th\u1eed.<\/p>\n

L\u1eadp t\u00e0i li\u1ec7u v\u1ec1 c\u00e1c gi\u1ea3 \u0111\u1ecbnh v\u00e0 ki\u1ec3m tra ch\u00fang t\u1ea1i t\u1ee7 \u0111i\u1ec7n. V\u00ed d\u1ee5, m\u1ed9t nghi\u00ean c\u1ee9u v\u1ec1 b\u1ea3o v\u1ec7 c\u1ea7n n\u00eau r\u00f5 d\u00f2ng \u0111i\u1ec7n ng\u1eafn m\u1ea1ch d\u1ef1 ki\u1ebfn, d\u00f2ng \u0111i\u1ec7n kh\u1edfi \u0111\u1ed9ng (inrush) d\u1ef1 ki\u1ebfn, kh\u1ea3 n\u0103ng mang d\u00f2ng c\u1ee7a d\u00e2y d\u1eabn v\u00e0 th\u1eddi gian c\u1eaft y\u00eau c\u1ea7u. C\u00e1c ph\u01b0\u01a1ng ph\u00e1p c\u00f3 t\u00ean g\u1ecdi c\u1ee5 th\u1ec3 nh\u01b0 th\u1eed nghi\u1ec7m ti\u00eam d\u00f2ng s\u01a1 c\u1ea5p, th\u1eed nghi\u1ec7m \u0111i\u1ec7n tr\u1edf c\u00e1ch \u0111i\u1ec7n ho\u1eb7c nghi\u00ean c\u1ee9u ph\u1ed1i h\u1ee3p s\u1ebd h\u1eefu \u00edch h\u01a1n so v\u1edbi m\u1ed9t tuy\u00ean b\u1ed1 chung chung r\u1eb1ng m\u1ed9t s\u1ea3n ph\u1ea9m \u0111\u1ea1t \u201cc\u1ea5p \u0111\u1ed9 c\u00f4ng nghi\u1ec7p.\u201d<\/p>\n

N\u1ebfu c\u00e2u tr\u1ea3 l\u1eddi thay \u0111\u1ed5i theo th\u1ecb tr\u01b0\u1eddng \u0111\u00edch, h\u1ec7 th\u1ed1ng \u0111i\u1ec7n \u00e1p ho\u1eb7c lo\u1ea1i \u1ee9ng d\u1ee5ng, h\u00e3y n\u00eau gi\u1ea3 \u0111\u1ecbnh \u0111\u00f3 trong th\u00f4ng s\u1ed1 k\u1ef9 thu\u1eadt v\u00e0 nh\u1eadn \u0111\u01b0\u1ee3c x\u00e1c nh\u1eadn b\u1eb1ng v\u0103n b\u1ea3n tr\u01b0\u1edbc khi ph\u00e1t h\u00e0nh.<\/p>\n

\"CHAC:<\/p>\n

So s\u00e1nh cho m\u1ed9t th\u00f4ng s\u1ed1 k\u1ef9 thu\u1eadt c\u00f3 t\u00ednh b\u1ea3o v\u1ec7<\/h2>\n\n\n\n\n\n\n\n
K\u00edch th\u01b0\u1edbc<\/th>\nL\u1ef1a ch\u1ecdn A<\/th>\nPh\u01b0\u01a1ng \u00e1n B<\/th>\n<\/tr>\n<\/thead>\n
\u0110\u1ea7u v\u00e0o<\/td>\nD\u1ea1ng nh\u1eb9 \u0111\u1ebfn trung b\u00ecnh<\/td>\nKi\u1ec3m tra c\u1ea5u h\u00ecnh kh\u1edfi \u0111\u1ed9ng thi\u1ebft b\u1ecb<\/td>\n<\/tr>\n
Kh\u1eafc ph\u1ee5c l\u1ed7i<\/td>\nPh\u1ee5 thu\u1ed9c v\u00e0o \u0111i\u1ec7n tr\u1edf v\u00f2ng l\u1eb7p<\/td>\nKi\u1ec3m tra d\u00f2ng \u0111i\u1ec7n l\u1ed7i \u0111\u01b0\u1ee3c \u0111o ho\u1eb7c t\u00ednh to\u00e1n<\/td>\n<\/tr>\n
C\u00e1c gi\u1ea3i ph\u00e1p thay th\u1ebf<\/td>\nC ho\u1eb7c D c\u00f3 th\u1ec3 ph\u00f9 h\u1ee3p v\u1edbi d\u00f2ng \u0111i\u1ec7n v\u00e0o cao h\u01a1n<\/td>\nGi\u1edbi h\u1ea1n cao h\u01a1n c\u00f3 th\u1ec3 l\u00e0m gi\u1ea3m bi\u00ean \u0111\u1ed9 l\u1ed7i<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n

C\u00e1c ho\u1ea1t \u0111\u1ed9ng l\u1ef1a ch\u1ecdn v\u00e0 mua s\u1eafm<\/h2>\n
    \n
  1. \u0110\u00f3ng b\u0103ng c\u00e1c gi\u1ea3 \u0111\u1ecbnh v\u1ec1 \u0111i\u1ec7n: \u0111i\u1ec7n \u00e1p h\u1ec7 th\u1ed1ng, s\u1ed1 c\u1ef1c, d\u00f2ng t\u1ea3i, ph\u01b0\u01a1ng ph\u00e1p d\u1eabn \u0111i\u1ec7n, d\u00f2ng s\u1ef1 c\u1ed1 v\u00e0 gi\u1edbi h\u1ea1n nhi\u1ec7t \u0111\u1ed9 m\u00f4i tr\u01b0\u1eddng.<\/li>\n
  2. Y\u00eau c\u1ea7u d\u1eef li\u1ec7u theo d\u00f2ng s\u1ea3n ph\u1ea9m: phi\u00ean b\u1ea3n ti\u00eau chu\u1ea9n, \u0111\u01b0\u1eddng \u0111\u1eb7c t\u00ednh d\u00f2ng c\u1eaft, kh\u1ea3 n\u0103ng ng\u1eaft, gi\u1edbi h\u1ea1n c\u1ef1c \u0111\u1ea5u d\u00e2y, k\u00edch th\u01b0\u1edbc v\u00e0 b\u1eb1ng ch\u1ee9ng th\u1eed nghi\u1ec7m.<\/li>\n
  3. Xem x\u00e9t vi\u1ec7c ph\u1ed1i h\u1ee3p v\u1edbi c\u00e1c thi\u1ebft b\u1ecb th\u01b0\u1ee3ng ngu\u1ed3n v\u00e0 h\u1ea1 ngu\u1ed3n; kh\u00f4ng suy lu\u1eadn t\u00ednh ch\u1ecdn l\u1ecdc t\u1eeb nh\u00e3n hi\u1ec7u ho\u1eb7c k\u00edch th\u01b0\u1edbc khung.<\/li>\n
  4. Ph\u00ea duy\u1ec7t m\u1eabu ho\u1eb7c b\u00e0i vi\u1ebft \u0111\u1ea7u ti\u00ean, ghi l\u1ea1i l\u1ef1c si\u1ebft v\u00e0 c\u00e1c \u0111i\u1ec3m ki\u1ec3m tra, \u0111\u1ed3ng th\u1eddi x\u00e1c \u0111\u1ecbnh ai l\u00e0 ng\u01b0\u1eddi th\u1ef1c hi\u1ec7n c\u00e1c b\u00e0i ki\u1ec3m tra ch\u1ea1y th\u1eed.<\/li>\n
  5. L\u1eadp k\u1ebf ho\u1ea1ch ph\u1ee5 t\u00f9ng v\u00e0 qu\u1ea3n l\u00fd thay \u0111\u1ed5i \u0111\u1ec3 vi\u1ec7c thay th\u1ebf sau n\u00e0y kh\u00f4ng l\u00e0m thay \u0111\u1ed5i \u00e2m th\u1ea7m hi\u1ec7u su\u1ea5t an to\u00e0n.<\/li>\n<\/ol>\n

    \u0110\u1ed1i v\u1edbi nh\u1eefng ng\u01b0\u1eddi mua \u0111ang so s\u00e1nh c\u00e1c d\u00f2ng s\u1ea3n ph\u1ea9m b\u1ea3o v\u1ec7 c\u00f3 th\u1ec3 c\u1ea5u h\u00ecnh, CHAC Electric cung c\u1ea5p th\u00f4ng tin c\u00f4ng khai v\u1ec1 C\u00e1c s\u1ea3n ph\u1ea9m MCB<\/strong><\/a> v\u00e0 thi\u1ebft b\u1ecb ph\u00e2n ph\u1ed1i \u0111i\u1ec7n<\/strong><\/a>. H\u00e3y coi c\u00e1c trang n\u00e0y l\u00e0 \u0111i\u1ec3m kh\u1edfi \u0111\u1ea7u v\u00e0 x\u00e1c nh\u1eadn d\u1eef li\u1ec7u m\u00f4 h\u00ecnh ch\u00ednh x\u00e1c cho d\u1ef1 \u00e1n c\u1ee7a b\u1ea1n.<\/p>\n

    <\/p>\n

    S\u1eed d\u1ee5ng d\u00f2ng \u0111i\u1ec7n r\u1ea7n \u0111\u1ec3 t\u00e1ch c\u00e1c l\u1ef1a ch\u1ecdn B, C v\u00e0 D<\/h2>\n

    A M\u00e1y bi\u1ebfn th\u1ebf MCB lo\u1ea1i B<\/strong><\/a> Kh\u00f4ng \u0111\u01b0\u1ee3c ch\u1ecdn v\u00ec t\u1ea3i ch\u1ec9 \u0111\u01a1n gi\u1ea3n l\u00e0 \u201cnh\u1ecf\u201d. So s\u00e1nh d\u00f2ng \u0111i\u1ec7n b\u00ecnh th\u01b0\u1eddng c\u1ee7a t\u1ea3i v\u1edbi d\u00f2ng \u0111i\u1ec7n r\u1ea7n khi kh\u1edfi \u0111\u1ed9ng c\u1ee7a nh\u00e0 s\u1ea3n xu\u1ea5t. \u0110\u01b0\u1eddng cong chuy\u1ebfn \u0111i c\u1ee7a MCB<\/strong><\/a> Sau \u0111\u00f3, h\u00e3y h\u1ecfi xem c\u1ea7n c\u00f3 \u0111\u01b0\u1eddng cong C ho\u1eb7c D \u0111\u1ec3 tr\u00e1nh tr\u01b0\u1eddng h\u1ee3p ng\u1eaft \u0111i\u1ec7n b\u1ea5t ng\u1edd hay kh\u00f4ng. d\u00f2ng \u0111i\u1ec7n r\u00f2 r\u1ec9<\/strong> C\u00e2u h\u1ecfi \u0111\u1eb7t ra l\u00e0 s\u1ef1 gia t\u0103ng n\u00e0y s\u1ebd k\u00e9o d\u00e0i bao l\u00e2u v\u00e0 li\u1ec7u m\u1ea1ch c\u00f3 th\u1ec3 ch\u1ecbu \u0111\u01b0\u1ee3c m\u1ed9t ph\u1ea3n \u1ee9ng t\u1eeb tr\u01b0\u1eddng ch\u1eadm h\u01a1n hay kh\u00f4ng.<\/p>\n

    C\u00e1c t\u00ecm ki\u1ebfm li\u00ean quan c\u1ee7a Google li\u00ean t\u1ee5c \u0111\u01b0a ra c\u00e1c so s\u00e1nh v\u1ec1 th\u1eddi gian b\u1eadt \u0111\u01b0\u1eddng cong B v\u00e0 so s\u00e1nh B so v\u1edbi C so v\u1edbi D, v\u00ec v\u1eady h\u00e3y bao g\u1ed3m k\u1ecbch b\u1ea3n kh\u1edfi \u0111\u1ed9ng t\u1ea3i th\u1ef1c t\u1ebf trong l\u1ecbch tr\u00ecnh thay v\u00ec g\u00e1n \u0111\u01b0\u1eddng cong theo th\u00f3i quen.<\/p>\n

    B\u00e0i vi\u1ebft li\u00ean quan: K\u00fd hi\u1ec7u c\u1ee7a MCB<\/a> Gi\u00fap k\u1ebft n\u1ed1i l\u1ef1a ch\u1ecdn \u0111\u01b0\u1eddng cong chuy\u1ebfn \u0111i v\u1edbi t\u1eadp b\u1ea3n v\u1ebd.<\/p>\n

    C\u00e1c c\u00e2u h\u1ecfi th\u01b0\u1eddng g\u1eb7p<\/h2>\n

    Kho\u1ea3ng ph\u1ea1m vi ho\u1ea1t \u0111\u1ed9ng c\u1ee7a m\u1ed9t b\u1ed9 c\u00f4ng t\u1eafc MCB lo\u1ea1i B l\u00e0 bao nhi\u00eau?<\/h3>\n

    Theo ti\u00eau chu\u1ea9n IEC 60898-1, v\u00f9ng ho\u1ea1t \u0111\u1ed9ng t\u1ee9c th\u1eddi th\u01b0\u1eddng \u0111\u01b0\u1ee3c x\u00e1c \u0111\u1ecbnh \u1edf kho\u1ea3ng 3\u20135 l\u1ea7n d\u00f2ng \u0111i\u1ec7n \u0111\u1ecbnh m\u1ee9c, nh\u01b0ng c\u00e1c gi\u1edbi h\u1ea1n ki\u1ec3m tra ch\u00ednh x\u00e1c v\u00e0 d\u1eef li\u1ec7u s\u1ea3n ph\u1ea9m lu\u00f4n \u0111\u01b0\u1ee3c quy \u0111\u1ecbnh ri\u00eang. Lu\u00f4n s\u1eed d\u1ee5ng \u0111\u01b0\u1eddng cong c\u1ee7a m\u1eabu \u0111\u01b0\u1ee3c cung c\u1ea5p.<\/p>\n

    B-curve MCBs \u0111\u01b0\u1ee3c s\u1eed d\u1ee5ng \u1edf \u0111\u00e2u?<\/h3>\n

    Ch\u00fang th\u01b0\u1eddng \u0111\u01b0\u1ee3c l\u1ef1a ch\u1ecdn cho c\u00e1c h\u1ec7 th\u1ed1ng chi\u1ebfu s\u00e1ng v\u00e0 \u1ed5 c\u1eafm chung c\u00f3 d\u00f2ng \u0111i\u1ec7n r\u00f2 r\u1ec9 h\u1ea1n ch\u1ebf. \u0110\u1ed9 d\u00e0i c\u1ee7a d\u00e2y c\u00e1p v\u00e0 tr\u1edf kh\u00e1ng v\u00f2ng r\u00f2 v\u1eabn ph\u1ea3i \u0111\u00e1p \u1ee9ng \u0111\u01b0\u1ee3c y\u00eau c\u1ea7u ng\u1eaft t\u1ef1 \u0111\u1ed9ng.<\/p>\n

    T\u00f4i c\u00f3 th\u1ec3 thay th\u1ebf \u0111\u01b0\u1eddng cong C b\u1eb1ng \u0111\u01b0\u1eddng cong B \u0111\u01b0\u1ee3c kh\u00f4ng?<\/h3>\n

    Ch\u1ec9 sau khi ki\u1ec3m tra l\u1ecbch s\u1eed s\u1ef1 c\u1ed1, t\u00ecnh tr\u1ea1ng d\u00f2ng \u0111i\u1ec7n r\u00f2 r\u1ec9 v\u00e0 d\u00f2ng \u0111i\u1ec7n qu\u00e1 t\u1ea3i. M\u1ee9c ng\u01b0\u1ee1ng t\u1eeb t\u00ednh th\u1ea5p h\u01a1n c\u00f3 th\u1ec3 c\u1ea3i thi\u1ec7n vi\u1ec7c gi\u1ea3i quy\u1ebft s\u1ef1 c\u1ed1, nh\u01b0ng c\u00f3 th\u1ec3 g\u00e2y ra s\u1ef1 c\u1ed1 khi kh\u1edfi \u0111\u1ed9ng.<\/p>\n

    Lo\u1ea1i B c\u00f3 t\u01b0\u01a1ng th\u00edch v\u1edbi DC kh\u00f4ng?<\/h3>\n

    Kh\u00f4ng. \u201cB\u201d l\u00e0 ch\u1ec9 \u0111\u1ecbnh v\u1ec1 \u0111\u01b0\u1eddng cong d\u00f2ng \u0111i\u1ec7n trong th\u1eddi gian c\u1ee7a m\u1ed9t d\u00f2ng r\u01a1le, kh\u00f4ng ph\u1ea3i l\u00e0 ch\u1ec9 s\u1ed1 \u0111\u1ecbnh m\u1ee9c DC. Vui l\u00f2ng ki\u1ec3m tra \u0111i\u1ec7n \u00e1p, c\u1ef1c v\u00e0 d\u1eef li\u1ec7u th\u1eed nghi\u1ec7m DC ri\u00eang bi\u1ec7t.<\/p>\n

    T\u00e0i li\u1ec7u tham kh\u1ea3o c\u00f3 th\u1ea9m quy\u1ec1n<\/h2>\n