{"id":4111,"date":"2026-09-09T10:13:06","date_gmt":"2026-09-09T10:13:06","guid":{"rendered":"https:\/\/huyuglobal.com\/?p=4111"},"modified":"2026-09-09T10:13:07","modified_gmt":"2026-09-09T10:13:07","slug":"what-is-n-o-normally-open","status":"publish","type":"post","link":"https:\/\/huyuglobal.com\/vi\/blog\/what-is-n-o-normally-open\/","title":{"rendered":"N\/O (Normally Open) l\u00e0 g\u00ec?"},"content":{"rendered":"<p>H\u01b0\u1edbng d\u1eabn n\u00e0y d\u00e0nh cho b\u1ea5t k\u1ef3 ai \u0111\u00e3 c\u00f3 kinh nghi\u1ec7m v\u1edbi s\u01a1 \u0111\u1ed3 m\u1ea1ch \u0111i\u1ec7n v\u00e0 \u0111\u00e3 g\u1eb7p ph\u1ea3i ch\u1eef vi\u1ebft t\u1eaft N\/O, ho\u1eb7c NO, khi \u0111\u1ecdc datasheet r\u01a1 le ho\u1eb7c ki\u1ec3m tra c\u00e1c \u0111\u1ea7u n\u1ed1i tr\u00ean contactor. N\/O l\u00e0 m\u1ed9t trong nh\u1eefng ch\u1eef vi\u1ebft t\u1eaft \u0111\u01b0\u1ee3c s\u1eed d\u1ee5ng r\u1ed9ng r\u00e3i nh\u1ea5t trong k\u1ef9 thu\u1eadt \u0111i\u1ec7n ng\u00e0y nay, c\u0169ng nh\u01b0 l\u00e0 m\u1ed9t ph\u1ea7n quan tr\u1ecdng trong vi\u1ec7c t\u1ea1o ra c\u00e1c h\u1ec7 th\u1ed1ng \u0111i\u1ec1u khi\u1ec3n, r\u01a1 le, contactor, c\u00f4ng t\u1eafc v\u00e0 h\u1ec7 th\u1ed1ng an to\u00e0n. B\u00e0i vi\u1ebft n\u00e0y nh\u1eb1m gi\u1ea3i th\u00edch \u00fd ngh\u0129a c\u1ee7a thu\u1eadt ng\u1eef normally open, c\u00e1ch ch\u1eef vi\u1ebft t\u1eaft N\/O \u0111\u01b0\u1ee3c th\u1ec3 hi\u1ec7n trong s\u01a1 \u0111\u1ed3 d\u00e2y \u0111i\u1ec7n, c\u00e1c s\u1ea3n ph\u1ea9m s\u1eed d\u1ee5ng ti\u1ebfp \u0111i\u1ec3m N\/O, s\u1ef1 kh\u00e1c bi\u1ec7t gi\u1eefa N\/O v\u00e0 N\/C (normally closed), v\u00e0 c\u00e1ch s\u1eed d\u1ee5ng c\u0169ng nh\u01b0 ki\u1ec3m tra ti\u1ebfp \u0111i\u1ec3m N\/O m\u1ed9t c\u00e1ch ch\u00ednh x\u00e1c.<\/p>\n<blockquote><p>Tr\u1ea3 l\u1eddi: N\/O l\u00e0 m\u1ed9t ch\u1eef vi\u1ebft t\u1eaft \u0111\u01b0\u1ee3c s\u1eed d\u1ee5ng r\u1ed9ng r\u00e3i trong thu\u1eadt ng\u1eef \u0111i\u1ec7n v\u00e0 \u0111\u1ea1i di\u1ec7n cho thu\u1eadt ng\u1eef normally open. Thu\u1eadt ng\u1eef n\u00e0y \u0111\u01b0\u1ee3c d\u00f9ng \u0111\u1ec3 ch\u1ec9 m\u1ed9t c\u00f4ng t\u1eafc, \u1edf tr\u1ea1ng th\u00e1i m\u1edf trong tr\u1ea1ng th\u00e1i ch\u01b0a ho\u1ea1t \u0111\u1ed9ng, do \u0111\u00f3 kh\u00f4ng c\u00f3 d\u00f2ng \u0111i\u1ec7n ch\u1ea1y qua. S\u01a1 \u0111\u1ed3 m\u1ea1ch t\u01b0\u01a1ng \u1ee9ng \u0111\u01b0\u1ee3c bi\u1ec3u di\u1ec5n b\u1eb1ng m\u1ed9t \u0111\u01b0\u1eddng c\u00f3 kho\u1ea3ng h\u1edf gi\u1ed1ng nh\u01b0 c\u1eeda \u0111ang h\u00e9 m\u1edf. Tr\u1ea1ng th\u00e1i c\u1ee7a c\u00f4ng t\u1eafc n\u00e0y thay \u0111\u1ed5i ngay khi r\u01a1 le ho\u1ea1t \u0111\u1ed9ng (v\u00ed d\u1ee5: k\u00edch ho\u1ea1t cu\u1ed9n d\u00e2y, nh\u1ea5n n\u00fat, n\u00e2ng phao). Tr\u00e1i ng\u01b0\u1ee3c v\u1edbi v\u1ecb tr\u00ed N\/O l\u00e0 v\u1ecb tr\u00ed N\/C (normally closed), c\u00f3 ngh\u0129a l\u00e0 c\u00f4ng t\u1eafc N\/C kh\u00f4ng \u0111\u01b0\u1ee3c k\u00edch ho\u1ea1t tr\u1eeb khi c\u1ea7n thi\u1ebft: n\u00f3 v\u1eabn \u0111\u00f3ng cho \u0111\u1ebfn khi c\u00f3 t\u00e1c \u0111\u1ed9ng. Lo\u1ea1i ti\u1ebfp \u0111i\u1ec3m N\/O \u0111\u01b0\u1ee3c s\u1eed d\u1ee5ng trong c\u00e1c tr\u01b0\u1eddng h\u1ee3p b\u1ea1n mu\u1ed1n \u0111i\u1ec1u khi\u1ec3n ho\u1eb7c th\u00f4ng b\u00e1o m\u1ed9t s\u1ef1 ki\u1ec7n. C\u00e1c lo\u1ea1i c\u00f4ng t\u1eafc N\/O th\u01b0\u1eddng \u0111\u01b0\u1ee3c k\u00edch ho\u1ea1t th\u00f4ng qua ti\u1ebfp \u0111i\u1ec3m N\/C v\u00ec l\u00fd do an to\u00e0n.<\/p><\/blockquote>\n<p style=\"text-align: center;\"><img loading=\"lazy\" decoding=\"async\" class=\"alignnone size-full wp-image-4113\" src=\"https:\/\/huyuglobal.com\/wp-content\/uploads\/2026\/09\/What-does-normally-open-actually-mean.webp\" alt=\"&quot;Normally open&quot; th\u1ef1c s\u1ef1 c\u00f3 ngh\u0129a l\u00e0 g\u00ec?\" width=\"1448\" height=\"1086\" \/><\/p>\n<h2>\u201cNormally open\u201d th\u1ef1c s\u1ef1 c\u00f3 ngh\u0129a l\u00e0 g\u00ec?<\/h2>\n<p>\u201cNormally open\u201d gi\u1ea3i th\u00edch tr\u1ea1ng th\u00e1i c\u1ee7a m\u1ed9t ti\u1ebfp \u0111i\u1ec3m \u0111i\u1ec7n ho\u1eb7c c\u00f4ng t\u1eafc c\u01a1 kh\u00ed khi n\u00f3 \u1edf tr\u1ea1ng th\u00e1i ngh\u1ec9. Thu\u1eadt ng\u1eef \u201cnormally\u201d \u0111\u1ec1 c\u1eadp \u0111\u1ebfn th\u1eddi \u0111i\u1ec3m tr\u01b0\u1edbc khi c\u00f4ng t\u1eafc \u0111\u01b0\u1ee3c k\u00edch ho\u1ea1t, c\u00f3 ngh\u0129a l\u00e0 ch\u01b0a ai nh\u1ea5n n\u00fat, cu\u1ed9n d\u00e2y c\u00f4ng t\u1eafc kh\u00f4ng \u0111\u01b0\u1ee3c c\u1ea5p \u0111i\u1ec7n v\u00e0 kh\u00f4ng c\u00f3 n\u01b0\u1edbc \u0111\u1ea1t \u0111\u1ebfn m\u1ee9c nh\u1ea5t \u0111\u1ecbnh. Thu\u1eadt ng\u1eef \u201copen\u201d c\u00f3 ngh\u0129a l\u00e0 c\u00f4ng t\u1eafc \u0111ang m\u1edf, t\u1ee9c l\u00e0 c\u00f3 m\u1ed9t kho\u1ea3ng kh\u00f4ng kh\u00ed gi\u1eefa c\u00e1c ti\u1ebfp \u0111i\u1ec3m, hay n\u00f3i c\u00e1ch kh\u00e1c m\u1ea1ch b\u1ecb ng\u1eaft v\u00e0 d\u00f2ng \u0111i\u1ec7n kh\u00f4ng ch\u1ea3y.<\/p>\n<p>M\u00f4 h\u00ecnh \u0111\u01a1n gi\u1ea3n nh\u1ea5t \u0111\u1ec3 hi\u1ec3u kh\u00e1i ni\u1ec7m n\u00e0y l\u00e0 ngh\u0129 v\u1ec1 m\u1ed9t c\u00f4ng t\u1eafc N\/O nh\u01b0 m\u1ed9t c\u00e1nh c\u1eeda m\u1eb7c \u0111\u1ecbnh \u0111ang m\u1edf v\u00e0 ch\u1ec9 cho ph\u00e9p ng\u01b0\u1eddi qua l\u1ea1i khi n\u00f3 \u0111\u01b0\u1ee3c gi\u1eef m\u1edf. Ngay khi n\u00fat \u0111\u01b0\u1ee3c th\u1ea3 ra, c\u1eeda \u0111\u00f3ng l\u1ea1i v\u00e0 m\u1ea1ch l\u1ea1i b\u1ecb ng\u1eaft. C\u1ee5m t\u1eeb \u201csprings back\u201d m\u00f4 t\u1ea3 h\u00e0nh vi n\u00e0y, \u0111i\u1ec1u n\u00e0y \u0111\u01b0\u1ee3c hi\u1ec3u b\u1ea5t k\u1ec3 lo\u1ea1i thi\u1ebft b\u1ecb \u0111\u01b0\u1ee3c s\u1eed d\u1ee5ng \u2013 d\u00f9 l\u00e0 r\u01a1 le, contactor hay n\u00fat b\u1ea5m trong m\u00e1y gi\u1eb7t c\u1ee7a b\u1ea1n.<\/p>\n<p>\u0110\u00e2y l\u00e0 m\u1ed9t ghi ch\u00fa ng\u1eafn g\u1ecdn d\u00e0nh cho ng\u01b0\u1eddi m\u1edbi b\u1eaft \u0111\u1ea7u. M\u1ecdi ng\u01b0\u1eddi th\u01b0\u1eddng n\u00f3i r\u1eb1ng m\u1ed9t c\u00f4ng t\u1eafc c\u00f3 th\u1ec3 \u201cb\u1eadt\u201d ho\u1eb7c \u201ct\u1eaft,\u201d nh\u01b0ng trong k\u1ef9 thu\u1eadt, c\u00e1c thu\u1eadt ng\u1eef \u201copen\u201d v\u00e0 \u201cclosed\u201d \u0111\u01b0\u1ee3c s\u1eed d\u1ee5ng \u0111\u1ec3 m\u00f4 t\u1ea3 t\u00ecnh hu\u1ed1ng khi kh\u00f4ng c\u00f3 \u0111\u01b0\u1eddng d\u1eabn v\u00e0 d\u00f2ng \u0111i\u1ec7n b\u1ecb ng\u1eaft, ho\u1eb7c \u0111\u01b0\u1eddng d\u1eabn ho\u00e0n ch\u1ec9nh t\u01b0\u01a1ng \u1ee9ng.<\/p>\n<h2>N\/O c\u00f3 ngh\u0129a l\u00e0 g\u00ec trong s\u01a1 \u0111\u1ed3 m\u1ea1ch?<\/h2>\n<p>Trong s\u01a1 \u0111\u1ed3 m\u1ea1ch, \u0111\u1eb7c bi\u1ec7t l\u00e0 s\u01a1 \u0111\u1ed3 thang \u0111\u01b0\u1ee3c \u00e1p d\u1ee5ng trong t\u1ef1 \u0111\u1ed9ng h\u00f3a c\u00f4ng nghi\u1ec7p, c\u00e1c ti\u1ebfp \u0111i\u1ec3m N\/O v\u00e0 N\/C c\u00f3 c\u00e1c k\u00fd hi\u1ec7u ti\u00eau chu\u1ea9n ri\u00eang cho ph\u00e9p \u0111\u1ecdc s\u01a1 \u0111\u1ed3 m\u00e0 kh\u00f4ng c\u1ea7n v\u0103n b\u1ea3n.<\/p>\n<table>\n<tbody>\n<tr>\n<th>K\u00fd hi\u1ec7u<\/th>\n<th>\u00dd ngh\u0129a<\/th>\n<th>Tr\u1ea1ng th\u00e1i ngh\u1ec9<\/th>\n<\/tr>\n<tr>\n<td>M\u1ed9t kho\u1ea3ng h\u1edf tr\u00ean \u0111\u01b0\u1eddng d\u00e2y: \u2014| |\u2014<\/td>\n<td>Ti\u1ebfp \u0111i\u1ec3m normally open (N\/O)<\/td>\n<td>M\u1edf \u2014 kh\u00f4ng c\u00f3 d\u00f2ng \u0111i\u1ec7n ch\u1ea3y cho \u0111\u1ebfn khi \u0111\u01b0\u1ee3c k\u00edch ho\u1ea1t<\/td>\n<\/tr>\n<tr>\n<td>M\u1ed9t d\u1ea5u g\u1ea1ch ch\u00e9o tr\u00ean \u0111\u01b0\u1eddng d\u00e2y: \u2014|\/|\u2014<\/td>\n<td>Ti\u1ebfp \u0111i\u1ec3m th\u01b0\u1eddng \u0111\u00f3ng (N\/C)<\/td>\n<td>\u0110\u00f3ng \u2014 d\u00f2ng \u0111i\u1ec7n ch\u1ea3y cho \u0111\u1ebfn khi \u0111\u01b0\u1ee3c k\u00edch ho\u1ea1t<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<p>K\u00fd hi\u1ec7u c\u1ee7a N\/O l\u00e0 m\u1ed9t \u0111\u01b0\u1eddng d\u00e2y c\u00f3 m\u1ed9t kho\u1ea3ng ng\u1eaft \u1edf gi\u1eefa, t\u01b0\u01a1ng t\u1ef1 nh\u01b0 m\u1ed9t c\u1ea7u n\u00e2ng m\u1edf. Khi s\u1ef1 ki\u1ec7n \u0111i\u1ec1u khi\u1ec3n x\u1ea3y ra (cu\u1ed9n d\u00e2y c\u1ee7a r\u01a1le tr\u00ean b\u1eadc thang \u0111\u01b0\u1ee3c c\u1ea5p \u0111i\u1ec7n) th\u00ec kho\u1ea3ng ng\u1eaft kh\u00f4ng c\u00f2n l\u00e0 kho\u1ea3ng ng\u1eaft n\u1eefa v\u00e0 d\u00f2ng \u0111i\u1ec7n b\u1eaft \u0111\u1ea7u ch\u1ea3y d\u1ecdc theo \u0111\u01b0\u1eddng d\u00e2y n\u00e0y \u0111\u1ebfn b\u1ea5t k\u1ef3 thi\u1ebft b\u1ecb n\u00e0o m\u00e0 \u0111\u01b0\u1eddng d\u00e2y n\u00e0y c\u1ea5p ngu\u1ed3n \u2013 m\u1ed9t contactor \u0111\u1ed9ng c\u01a1, \u0111\u00e8n t\u00edn hi\u1ec7u, v.v. Trong logic thang, m\u1ed7i ti\u1ebfp \u0111i\u1ec3m c\u00f3 m\u1ed9t t\u00ean ph\u1ea3n \u00e1nh ph\u1ea7n t\u1eed \u0111i\u1ec1u khi\u1ec3n \u0111\u01b0\u1ee3c g\u00e1n nh\u00e3n l\u00e0 \u201cCR1\u201d cho r\u01a1le \u0111i\u1ec1u khi\u1ec3n 1, nh\u01b0ng c\u00f9ng m\u1ed9t r\u01a1le \u0111i\u1ec1u khi\u1ec3n c\u00f3 th\u1ec3 c\u00f3 nhi\u1ec1u ti\u1ebfp \u0111i\u1ec3m \u0111\u01b0\u1ee3c m\u00f4 t\u1ea3 tr\u00ean s\u01a1 \u0111\u1ed3, m\u1ed9t s\u1ed1 l\u00e0 N\/O v\u00e0 s\u1ed1 kh\u00e1c l\u00e0 N\/C.<\/p>\n<p>Vi\u1ec7c \u0111\u1ecdc c\u00e1c b\u1ea3n v\u1ebd n\u00e0y l\u00e0 c\u00f4ng vi\u1ec7c h\u00e0ng ng\u00e0y c\u1ee7a c\u00e1c k\u1ef9 s\u01b0 thi\u1ebft k\u1ebf h\u1ec7 th\u1ed1ng \u0111i\u1ec1u khi\u1ec3n c\u00f4ng nghi\u1ec7p, v\u00e0 c\u00e1c kh\u00e1i ni\u1ec7m c\u01a1 b\u1ea3n \u2014 ti\u1ebfp \u0111i\u1ec3m l\u00e0m g\u00ec, c\u00e1ch cu\u1ed9n d\u00e2y v\u00e0 ti\u1ebfp \u0111i\u1ec3m li\u00ean k\u1ebft, c\u00e1ch m\u1ed9t s\u01a1 \u0111\u1ed3 \u0111i\u1ec7n tr\u1edf th\u00e0nh m\u1ed9t b\u1ea3ng \u0111i\u1ec1u khi\u1ec3n ho\u1ea1t \u0111\u1ed9ng \u2014 l\u00e0 nh\u1eefng \u00fd t\u01b0\u1edfng n\u1ec1n t\u1ea3ng cho c\u00e1c d\u1ecbch v\u1ee5 k\u1ef9 thu\u1eadt \u0111i\u1ec7n \u0111\u01b0\u1ee3c s\u1eed d\u1ee5ng trong c\u00e1c d\u1ef1 \u00e1n s\u1ea3n xu\u1ea5t v\u00e0 x\u00e2y d\u1ef1ng, m\u00e0 ch\u00fang t\u00f4i kh\u1ea3o s\u00e1t trong <a href=\"https:\/\/huyuglobal.com\/vi\/blog\/electrical-engineering-solutions-for-industrial-products\/\">h\u01b0\u1edbng d\u1eabn v\u1ec1 gi\u1ea3i ph\u00e1p k\u1ef9 thu\u1eadt \u0111i\u1ec7n cho s\u1ea3n ph\u1ea9m c\u00f4ng nghi\u1ec7p<\/a>.<\/p>\n<h2>N\/O c\u00f3 ngh\u0129a l\u00e0 g\u00ec trong k\u1ef9 thu\u1eadt \u0111i\u1ec7n?<\/h2>\n<p>Trong l\u0129nh v\u1ef1c k\u1ef9 thu\u1eadt \u0111i\u1ec7n, thu\u1eadt ng\u1eef N\/O \u0111\u1ec1 c\u1eadp \u0111\u1ebfn m\u1ed9t nh\u00f3m h\u00e0nh vi \u0111i\u1ec1u khi\u1ec3n. Khi c\u00e1c k\u1ef9 s\u01b0 n\u00f3i r\u1eb1ng c\u00f3 m\u1ed9t r\u01a1le v\u1edbi ti\u1ebfp \u0111i\u1ec3m N\/O, h\u1ecd \u0111\u1ec1 c\u1eadp \u0111\u1ebfn ti\u1ebfp \u0111i\u1ec3m \u0111\u1ea7u ra c\u1ee7a r\u01a1le \u1edf tr\u1ea1ng th\u00e1i \u2018m\u1edf\u2019 khi kh\u00f4ng c\u00f3 d\u00f2ng \u0111i\u1ec7n v\u00e0 \u0111\u00f3ng khi c\u00f3 d\u00f2ng \u0111i\u1ec7n. Thu\u1eadt ng\u1eef ti\u1ebfp \u0111i\u1ec3m \u0111\u1ec1 c\u1eadp \u0111\u1ebfn ph\u00eda \u2018\u0111\u1ea7u ra\u2019 c\u1ee7a r\u01a1le; thu\u1eadt ng\u1eef cu\u1ed9n d\u00e2y \u0111\u1ec1 c\u1eadp \u0111\u1ebfn ph\u00eda \u2018\u0111\u1ea7u v\u00e0o\u2019. Kh\u00e1i ni\u1ec7m \u2018\u0111\u1ea7u v\u00e0o \u0111i\u1ec1u khi\u1ec3n \u0111\u1ea7u ra\u2019, cung c\u1ea5p s\u1ef1 c\u00e1ch ly \u0111i\u1ec7n gi\u1eefa hai b\u1ed9 \u0111i\u1ec1u khi\u1ec3n, l\u00e0 b\u1ea3n ch\u1ea5t c\u1ee7a logic r\u01a1le v\u00e0 t\u1ef1 \u0111\u1ed9ng h\u00f3a.<\/p>\n<p>C\u00e1c \u1ee9ng d\u1ee5ng th\u1ef1c t\u1ebf c\u1ee7a \u00fd t\u01b0\u1edfng n\u00e0y c\u1ea7n \u0111\u01b0\u1ee3c \u0111\u1ec1 c\u1eadp v\u00ec ch\u00fang \u1ea3nh h\u01b0\u1edfng \u0111\u1ebfn c\u00e1c quy\u1ebft \u0111\u1ecbnh thi\u1ebft k\u1ebf \u0111\u01b0\u1ee3c \u0111\u01b0a ra:<\/p>\n<ul>\n<li>Ti\u1ebfp \u0111i\u1ec3m N\/O l\u00e0 l\u1ef1a ch\u1ecdn h\u00e0ng \u0111\u1ea7u cho \u201cth\u1ef1c hi\u1ec7n m\u1ed9t h\u00e0nh \u0111\u1ed9ng theo l\u1ec7nh.\u201d Kh\u1edfi \u0111\u1ed9ng \u0111\u1ed9ng c\u01a1, b\u1eadt solenoid, b\u00e1o hi\u1ec7u b\u00e1o \u0111\u1ed9ng, v\u00e0 kh\u00f3a m\u1ea1ch.<\/li>\n<li>Ti\u1ebfp \u0111i\u1ec3m N\/C l\u00e0 l\u1ef1a ch\u1ecdn \u0111\u1ea7u ti\u00ean \u0111\u1ec3 v\u1eadn h\u00e0nh m\u1ed9t quy tr\u00ecnh: L\u00e0m qu\u1ea1t ho\u1ea1t \u0111\u1ed9ng cho \u0111\u1ebfn khi c\u00f4ng t\u1eafc nhi\u1ec7t m\u1edf, cho ph\u00e9p ng\u01b0\u1eddi d\u00f9ng s\u1eed d\u1ee5ng m\u00e1y cho \u0111\u1ebfn khi b\u1ea3o v\u1ec7 \u0111\u01b0\u1ee3c th\u00e1o ra, v\u00e0 k\u00edch ho\u1ea1t b\u00e1o \u0111\u1ed9ng cho \u0111\u1ebfn khi h\u1ec7 th\u1ed1ng ho\u1ea1t \u0111\u1ed9ng b\u00ecnh th\u01b0\u1eddng.<\/li>\n<li>Trong tr\u01b0\u1eddng h\u1ee3p logic an to\u00e0n, ph\u1ea3i s\u1eed d\u1ee5ng m\u1ea1ch N\/C. N\u1ebfu m\u1ea1ch an to\u00e0n \u0111\u01b0\u1ee3c k\u1ebft n\u1ed1i qua N\/C, th\u00ec khi d\u00e2y b\u1ecb \u0111\u1ee9t, cu\u1ed9n d\u00e2y m\u1ea5t \u0111i\u1ec7n v\u00e0 m\u00e1y d\u1eebng ho\u1ea1t \u0111\u1ed9ng. H\u1ec7 th\u1ed1ng s\u1ebd an to\u00e0n. D\u00e2y N\/O s\u1ebd d\u1eabn \u0111\u1ebfn c\u00e1c t\u00ecnh hu\u1ed1ng r\u1ee7i ro khi \u0111\u1ee9t d\u00e2y tr\u00f4ng gi\u1ed1ng nh\u01b0 \u201ckh\u00f4ng nh\u1eadn \u0111\u01b0\u1ee3c l\u1ec7nh\u201d v\u00e0 d\u1eabn \u0111\u1ebfn m\u00e1y \u0111\u01b0\u1ee3c k\u00edch ho\u1ea1t.<\/li>\n<\/ul>\n<p>Khi l\u00e0m vi\u1ec7c v\u1edbi c\u00e1c m\u1ea1ch n\u00e0y, b\u1ed1i c\u1ea3nh \u0111i\u1ec7n \u00e1p r\u1ea5t quan tr\u1ecdng. M\u1ea1ch \u0111i\u1ec1u khi\u1ec3n trong c\u00e1c b\u1ea3ng th\u01b0\u01a1ng m\u1ea1i v\u00e0 c\u00f4ng nghi\u1ec7p B\u1eafc M\u1ef9 th\u01b0\u1eddng ch\u1ea1y \u1edf 120 V AC l\u1ea5y t\u1eeb m\u1ed9t b\u1ed9 ng\u1eaft m\u1ea1ch m\u1ed9t c\u1ef1c, trong khi c\u00e1c h\u1ec7 th\u1ed1ng \u0111i\u1ec1u khi\u1ec3n v\u00e0 ph\u00e2n ph\u1ed1i ba pha n\u1eb7ng h\u01a1n ho\u1ea1t \u0111\u1ed9ng \u1edf \u0111i\u1ec7n \u00e1p cao h\u01a1n \u2014 v\u00e0 s\u1ef1 ph\u00e2n bi\u1ec7t gi\u1eefa d\u00e2y \u0111i\u1ec1u khi\u1ec3n \u0111i\u1ec7n \u00e1p th\u1ea5p v\u00e0 d\u00e2y ngu\u1ed3n \u0111i\u1ec7n \u00e1p cao l\u00e0 \u0111i\u1ec1u m\u00e0 m\u1ecdi k\u1ef9 thu\u1eadt vi\u00ean ph\u1ea3i t\u00f4n tr\u1ecdng tr\u01b0\u1edbc khi ch\u1ea1m v\u00e0o b\u1ea3ng \u0111i\u1ec1u khi\u1ec3n, nh\u01b0 \u0111\u01b0\u1ee3c gi\u1ea3i th\u00edch trong h\u01b0\u1edbng d\u1eabn c\u1ee7a ch\u00fang t\u00f4i v\u1ec1 <a href=\"https:\/\/huyuglobal.com\/vi\/blog\/the-difference-between-high-voltage-and-low-voltage\/\">h\u01b0\u1edbng d\u1eabn \u0111i\u1ec7n \u00e1p cao v\u00e0 \u0111i\u1ec7n \u00e1p th\u1ea5p<\/a>.<\/p>\n<p style=\"text-align: center;\"><img loading=\"lazy\" decoding=\"async\" class=\"alignnone size-full wp-image-4114\" src=\"https:\/\/huyuglobal.com\/wp-content\/uploads\/2026\/09\/What-kinds-of-products-use-N-O-contacts.webp\" alt=\"Nh\u1eefng lo\u1ea1i s\u1ea3n ph\u1ea9m n\u00e0o s\u1eed d\u1ee5ng ti\u1ebfp \u0111i\u1ec3m N\/O?\" width=\"1448\" height=\"1086\" \/><\/p>\n<h2>Nh\u1eefng lo\u1ea1i s\u1ea3n ph\u1ea9m n\u00e0o s\u1eed d\u1ee5ng ti\u1ebfp \u0111i\u1ec3m N\/O?<\/h2>\n<p>Ti\u1ebfp \u0111i\u1ec3m th\u01b0\u1eddng m\u1edf c\u00f3 m\u1eb7t trong h\u1ea7u h\u1ebft c\u00e1c thi\u1ebft b\u1ecb \u0111i\u1ec1u khi\u1ec3n \u0111i\u1ec7n t\u1eed \u0111\u00e3 th\u1ea5y tr\u01b0\u1edbc \u0111\u00e2y. D\u01b0\u1edbi \u0111\u00e2y l\u00e0 ba lo\u1ea1i thi\u1ebft b\u1ecb ch\u00ednh bao g\u1ed3m c\u00e1c lo\u1ea1i b\u1ed9 truy\u1ec1n \u0111\u1ed9ng kh\u00e1c nhau.<\/p>\n<table>\n<tbody>\n<tr>\n<th>Thi\u1ebft b\u1ecb<\/th>\n<th>\u0110i\u1ec1u khi\u1ec3n ti\u1ebfp \u0111i\u1ec3m N\/O b\u1eb1ng c\u00e1ch n\u00e0o<\/th>\n<th>S\u1eed d\u1ee5ng \u0111i\u1ec3n h\u00ecnh c\u1ee7a N\/O<\/th>\n<\/tr>\n<tr>\n<td>R\u01a1 le<\/td>\n<td>Cu\u1ed9n d\u00e2y \u0111\u01b0\u1ee3c c\u1ea5p \u0111i\u1ec7n<\/td>\n<td>Chuy\u1ec3n \u0111\u1ed5i t\u00edn hi\u1ec7u \u0111i\u1ec1u khi\u1ec3n; m\u1ea1ch li\u00ean kh\u00f3a<\/td>\n<\/tr>\n<tr>\n<td>R\u01a1 le ti\u1ebfp x\u00fac<\/td>\n<td>Cu\u1ed9n d\u00e2y \u0111\u01b0\u1ee3c c\u1ea5p \u0111i\u1ec7n<\/td>\n<td>Chuy\u1ec3n \u0111\u1ed5i t\u1ea3i \u0111\u1ed9ng c\u01a1 v\u00e0 t\u1ea3i nhi\u1ec7t theo l\u1ec7nh<\/td>\n<\/tr>\n<tr>\n<td>N\u00fat nh\u1ea5n (b\u1eaft \u0111\u1ea7u)<\/td>\n<td>Nh\u1ea5n b\u1eb1ng ng\u00f3n tay<\/td>\n<td>N\u00fat kh\u1edfi \u0111\u1ed9ng tr\u00ean m\u00e1y m\u00f3c, c\u1eeda, chu\u00f4ng<\/td>\n<\/tr>\n<tr>\n<td>C\u00f4ng t\u1eafc gi\u1edbi h\u1ea1n<\/td>\n<td>\u0110\u00f2n b\u1ea9y c\u01a1 h\u1ecdc ho\u1eb7c con l\u0103n b\u1ecb t\u00e1c \u0111\u1ed9ng b\u1edfi b\u1ed9 ph\u1eadn chuy\u1ec3n \u0111\u1ed9ng<\/td>\n<td>Ph\u00e1t hi\u1ec7n \u0111i\u1ec3m cu\u1ed1i h\u00e0nh tr\u00ecnh, c\u1ea3m bi\u1ebfn s\u1ef1 hi\u1ec7n di\u1ec7n<\/td>\n<\/tr>\n<tr>\n<td>C\u00f4ng t\u1eafc phao<\/td>\n<td>M\u1ee9c ch\u1ea5t l\u1ecfng t\u0103ng ho\u1eb7c gi\u1ea3m<\/td>\n<td>B\u01a1m kh\u1edfi \u0111\u1ed9ng khi b\u1ec3 th\u1ea5p \/ c\u1ea3nh b\u00e1o m\u1ee9c cao<\/td>\n<\/tr>\n<tr>\n<td>B\u1ed9 \u0111i\u1ec1u nhi\u1ec7t \/ c\u00f4ng t\u1eafc nhi\u1ec7t \u0111\u1ed9<\/td>\n<td>Thay \u0111\u1ed5i nhi\u1ec7t \u0111\u1ed9<\/td>\n<td>\u0110i\u1ec1u khi\u1ec3n b\u1eadt\/t\u1eaft b\u1ed9 gia nhi\u1ec7t ho\u1eb7c qu\u1ea1t<\/td>\n<\/tr>\n<tr>\n<td>C\u00f4ng t\u1eafc \u00e1p su\u1ea5t<\/td>\n<td>\u00c1p su\u1ea5t t\u0103ng ho\u1eb7c gi\u1ea3m<\/td>\n<td>Kh\u1edfi \u0111\u1ed9ng\/d\u1eebng m\u00e1y n\u00e9n, c\u1ea3nh b\u00e1o \u00e1p su\u1ea5t th\u1ea5p<\/td>\n<\/tr>\n<tr>\n<td>\u0110\u1ea7u ra c\u1ea3m bi\u1ebfn kho\u1ea3ng c\u00e1ch<\/td>\n<td>Ph\u00e1t hi\u1ec7n v\u1eadt th\u1ec3 \u0111i v\u00e0o v\u00f9ng c\u1ea3m bi\u1ebfn<\/td>\n<td>\u0110\u1ebfm, ph\u00e1t hi\u1ec7n v\u1ecb tr\u00ed trong t\u1ef1 \u0111\u1ed9ng h\u00f3a<\/td>\n<\/tr>\n<tr>\n<td>Ti\u1ebfp \u0111i\u1ec3m ph\u1ee5 tr\u00ean b\u1ed9 ng\u1eaft m\u1ea1ch ho\u1eb7c contactor<\/td>\n<td>Thi\u1ebft b\u1ecb ch\u00ednh ho\u1ea1t \u0111\u1ed9ng<\/td>\n<td>Ph\u1ea3n h\u1ed3i tr\u1ea1ng th\u00e1i: \u201cb\u1ed9 ng\u1eaft m\u1ea1ch \u0111ang b\u1eadt,\u201d \u201ccontactor \u0111\u00e3 h\u00fat\u201d<\/td>\n<\/tr>\n<tr>\n<td>N\u00fat nh\u1ea5n chu\u00f4ng c\u1eeda<\/td>\n<td>Nh\u1ea5n b\u1eb1ng ng\u00f3n tay<\/td>\n<td>Thi\u1ebft b\u1ecb N\/O h\u00e0ng ng\u00e0y m\u00e0 ai c\u0169ng bi\u1ebft<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<p>C\u00f3 hai \u0111i\u1ec3m \u0111\u00e1ng ch\u00fa \u00fd v\u00ec ch\u00fang minh h\u1ecda c\u00e1ch kh\u00e1i ni\u1ec7m N\/O \u0111\u01b0\u1ee3c s\u1eed d\u1ee5ng. \u0110\u1ea7u ti\u00ean, ti\u1ebfp \u0111i\u1ec3m ph\u1ee5 c\u1ee7a b\u1ed9 ng\u1eaft m\u1ea1ch b\u00e1o cho h\u1ec7 th\u1ed1ng \u0111i\u1ec1u khi\u1ec3n bi\u1ebft tr\u1ea1ng th\u00e1i c\u1ee7a b\u1ed9 ng\u1eaft m\u1ea1ch. Ti\u1ebfp \u0111i\u1ec3m ph\u1ee5 s\u1ebd \u0111\u00f3ng ho\u1eb7c m\u1edf khi b\u1ed9 ng\u1eaft m\u1ea1ch nh\u1ea3y v\u00e0 g\u1eedi t\u00edn hi\u1ec7u \u0111\u1ebfn PLC ho\u1eb7c c\u1ea3nh b\u00e1o. \u0110\u00e2y l\u00e0 l\u00fd do t\u1ea1i sao vi\u1ec7c ch\u1ecdn \u0111\u00fang d\u00f2ng b\u1ea3o v\u1ec7 l\u1ea1i quan tr\u1ecdng trong c\u00e1c t\u1ee7 \u0111i\u1ec7n c\u00f4ng nghi\u1ec7p, v\u00e0 ch\u00fang t\u00f4i <a href=\"https:\/\/huyuglobal.com\/vi\/blog\/rccb-vs-rcbo\/\">H\u01b0\u1edbng d\u1eabn RCCB vs RCBO<\/a> gi\u1ea3i th\u00edch c\u00e1c thi\u1ebft b\u1ecb m\u00e0 tr\u1ea1ng th\u00e1i b\u00ean trong c\u1ee7a ch\u00fang \u0111\u01b0\u1ee3c c\u00e1c ti\u1ebfp \u0111i\u1ec3m \u0111\u00f3 b\u00e1o c\u00e1o.<\/p>\n<p>M\u1ed9t \u0111i\u1ec3m quan tr\u1ecdng kh\u00e1c l\u00e0 th\u1ecb tr\u01b0\u1eddng r\u01a1 le, contactor v\u00e0 b\u1ed9 ng\u1eaft m\u1ea1ch kh\u00e1 to\u00e0n c\u1ea7u. Khi m\u1ed9t d\u1ef1 \u00e1n y\u00eau c\u1ea7u s\u1eed d\u1ee5ng c\u00e1c thi\u1ebft b\u1ecb \u0111i\u1ec1u khi\u1ec3n \u0111\u01b0\u1ee3c ch\u1ee9ng nh\u1eadn, \u0111i\u1ec1u \u0111\u00f3 c\u00f3 ngh\u0129a l\u00e0 c\u00e1c ti\u00eau chu\u1ea9n ch\u1ee9ng nh\u1eadn cung c\u1ea5p s\u1ef1 \u0111\u1ea3m b\u1ea3o cho vi\u1ec7c l\u1eafp \u0111\u1eb7t. \u0110\u1ed1i v\u1edbi c\u00e1c b\u1ed9 ng\u1eaft m\u1ea1ch s\u1eed d\u1ee5ng trong c\u00f9ng t\u1ee7 \u0111i\u1ec7n v\u1edbi m\u1ea1ch \u0111i\u1ec1u khi\u1ec3n c\u1ee7a b\u1ea1n, ti\u00eau chu\u1ea9n UL 489 l\u00e0 chu\u1ea9n m\u1ef1c B\u1eafc M\u1ef9, v\u00e0 ch\u00fang t\u00f4i <a href=\"https:\/\/huyuglobal.com\/vi\/blog\/what-is-ul-489-breakers\/\">H\u01b0\u1edbng d\u1eabn c\u1ea7u dao UL 489<\/a> gi\u1ea3i th\u00edch nh\u1eefng g\u00ec ch\u1ee9ng nh\u1eadn th\u1ef1c s\u1ef1 \u0111\u1ea3m b\u1ea3o.<\/p>\n<p>Trong ng\u00f4n ng\u1eef h\u00e0ng ng\u00e0y, ch\u00fang ta s\u1eed d\u1ee5ng t\u1eeb \u201cb\u1eadt\/t\u1eaft\u201d, gi\u1ed1ng nh\u01b0 trong c\u00e1c m\u1ea1ch \u0111i\u1ec7n gia \u0111\u00ecnh, n\u01a1i c\u00f4ng t\u1eafc \u0111\u01b0\u1ee3c \u0111i\u1ec1u khi\u1ec3n c\u01a1 h\u1ecdc b\u1eadt\/t\u1eaft ho\u1eb7c b\u1eadt\/t\u1eaft b\u1eb1ng ng\u00f3n tay. N\u1ebfu b\u1ea1n mu\u1ed1n xem c\u00e1ch thu\u1eadt ng\u1eef n\u00e0y \u00e1p d\u1ee5ng v\u00e0o c\u00e1c thi\u1ebft b\u1ecb d\u00e2y \u0111i\u1ec7n th\u1ef1c t\u1ebf trong nh\u00e0, t\u00e0i li\u1ec7u h\u01b0\u1edbng d\u1eabn lo\u1ea1i c\u00f4ng t\u1eafc t\u1eeb nh\u00e0 s\u1ea3n xu\u1ea5t thi\u1ebft b\u1ecb d\u00e2y \u0111i\u1ec7n igotoele s\u1ebd gi\u1edbi thi\u1ec7u ph\u1ea7n c\u1ee9ng h\u00e0ng ng\u00e0y v\u1edbi c\u00f9ng logic N\/O v\u00e0 N\/C: <a href=\"https:\/\/igotoele.com\/blog\/different-kinds-of-switches-in-electrical\/\" target=\"_blank\" rel=\"noopener\">c\u00e1c lo\u1ea1i c\u00f4ng t\u1eafc \u0111i\u1ec7n kh\u00e1c nhau \u0111\u01b0\u1ee3c gi\u1ea3i th\u00edch<\/a>.<\/p>\n<p style=\"text-align: center;\"><img loading=\"lazy\" decoding=\"async\" class=\"alignnone size-full wp-image-4115\" src=\"https:\/\/huyuglobal.com\/wp-content\/uploads\/2026\/09\/NO-vs-NC-what-is-the-difference.webp\" alt=\"N\/O v\u00e0 N\/C: s\u1ef1 kh\u00e1c bi\u1ec7t l\u00e0 g\u00ec\" width=\"1448\" height=\"1086\" \/><\/p>\n<h2>N\/O v\u00e0 N\/C: s\u1ef1 kh\u00e1c bi\u1ec7t l\u00e0 g\u00ec?<\/h2>\n<p>S\u1ef1 ph\u00e2n bi\u1ec7t gi\u1eefa N\/O v\u00e0 N\/C \u0111\u01a1n gi\u1ea3n d\u1ef1a tr\u00ean tr\u1ea1ng th\u00e1i ngh\u1ec9 c\u1ee7a c\u00f4ng t\u1eafc khi kh\u00f4ng c\u00f3 g\u00ec x\u1ea3y ra:<\/p>\n<table>\n<tbody>\n<tr>\n<th>Thu\u1ed9c t\u00ednh<\/th>\n<th>N\/O (Th\u00f4ng th\u01b0\u1eddng m\u1edf)<\/th>\n<th>N\/C (Th\u00f4ng th\u01b0\u1eddng \u0111\u00f3ng)<\/th>\n<\/tr>\n<tr>\n<td>Tr\u1ea1ng th\u00e1i ngh\u1ec9<\/td>\n<td>M\u1edf \u2014 kh\u00f4ng c\u00f3 d\u00f2ng \u0111i\u1ec7n ch\u1ea1y qua<\/td>\n<td>\u0110\u00f3ng \u2014 d\u00f2ng \u0111i\u1ec7n ch\u1ea1y qua<\/td>\n<\/tr>\n<tr>\n<td>Khi \u0111\u01b0\u1ee3c k\u00edch ho\u1ea1t<\/td>\n<td>\u0110\u00f3ng \u2014 d\u00f2ng \u0111i\u1ec7n b\u1eaft \u0111\u1ea7u ch\u1ea1y<\/td>\n<td>M\u1edf \u2014 d\u00f2ng \u0111i\u1ec7n ng\u1eebng ch\u1ea1y<\/td>\n<\/tr>\n<tr>\n<td>K\u00fd hi\u1ec7u s\u01a1 \u0111\u1ed3<\/td>\n<td>Kho\u1ea3ng c\u00e1ch tr\u00ean \u0111\u01b0\u1eddng d\u00e2y<\/td>\n<td>\u0110\u01b0\u1eddng d\u00e2y c\u00f3 g\u1ea1ch ch\u00e9o<\/td>\n<\/tr>\n<tr>\n<td>M\u00f4 h\u00ecnh t\u01b0 duy<\/td>\n<td>C\u1eeda ch\u1ec9 \u0111\u01b0\u1ee3c gi\u1eef \u0111\u00f3ng khi nh\u1ea5n<\/td>\n<td>C\u1eeda ch\u1ec9 \u0111\u01b0\u1ee3c gi\u1eef m\u1edf khi nh\u1ea5n<\/td>\n<\/tr>\n<tr>\n<td>\u1ee8ng d\u1ee5ng \u0111i\u1ec3n h\u00ecnh<\/td>\n<td>T\u00edn hi\u1ec7u kh\u1edfi \u0111\u1ed9ng, l\u1ec7nh, ch\u1ee9c n\u0103ng \u201cb\u1eadt\u201d<\/td>\n<td>M\u1ea1ch d\u1eebng, b\u1ea3o v\u1ec7, c\u1ea3nh b\u00e1o, kh\u00f3a li\u00ean \u0111\u1ed9ng<\/td>\n<\/tr>\n<tr>\n<td>H\u00e0nh vi khi h\u1ecfng n\u1ebfu d\u00e2y b\u1ecb \u0111\u1ee9t<\/td>\n<td>M\u1ea1ch v\u1eabn t\u1eaft \u2014 c\u00f3 th\u1ec3 kh\u00f4ng kh\u1edfi \u0111\u1ed9ng \u0111\u01b0\u1ee3c<\/td>\n<td>M\u1ea1ch m\u1edf \u2014 d\u1eebng an to\u00e0n<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<p>Nhi\u1ec1u thi\u1ebft b\u1ecb c\u00f3 c\u1ea3 ti\u1ebfp \u0111i\u1ec3m N\/O v\u00e0 N\/C. V\u00ed d\u1ee5, m\u1ed9t r\u01a1 le c\u00f3 th\u1ec3 c\u00f3 ti\u1ebfp \u0111i\u1ec3m chuy\u1ec3n \u0111\u1ed5i trong \u0111\u00f3 trong tr\u1ea1ng th\u00e1i ngh\u1ec9, l\u01b0\u1ee1i ti\u1ebfp \u0111i\u1ec3m di \u0111\u1ed9ng ti\u1ebfp x\u00fac v\u1edbi m\u1ed9t c\u1ef1c c\u1ed1 \u0111\u1ecbnh \u1edf ph\u00eda N\/C v\u00e0 khi \u0111\u01b0\u1ee3c c\u1ea5p \u0111i\u1ec7n th\u00ec ti\u1ebfp x\u00fac \u1edf ph\u00eda N\/O. Do c\u1ea5u tr\u00fac m\u1ed9t c\u1ef1c hai n\u00e9m, \u1ed5 c\u1eafm r\u01a1 le \u0111\u01b0\u1ee3c thi\u1ebft k\u1ebf v\u1edbi c\u00e1c c\u1ef1c C, N\/O v\u00e0 N\/C. Khi t\u1ea1o m\u1ea1ch \u0111i\u1ec1u khi\u1ec3n, k\u1ef9 s\u01b0 ch\u1ecdn ph\u00eda th\u00edch h\u1ee3p \u0111\u1ec3 s\u1eed d\u1ee5ng d\u1ef1a tr\u00ean y\u00eau c\u1ea7u logic c\u1ee7a h\u1ecd, v\u00e0 h\u1ecd th\u01b0\u1eddng s\u1eed d\u1ee5ng c\u1ea3 hai ph\u00eda c\u1ee7a c\u00f9ng m\u1ed9t thi\u1ebft b\u1ecb trong c\u00e1c b\u1eadc kh\u00e1c nhau.<\/p>\n<p>C\u1ea7n l\u01b0u \u00fd r\u1eb1ng \u0111\u1ed1i v\u1edbi b\u1ea5t k\u1ef3 thi\u1ebft b\u1ecb n\u00e0o m\u00e0 tr\u1ea1ng th\u00e1i t\u1eaft ph\u1ea3i l\u00e0 \u0111i\u1ec1u ki\u1ec7n m\u1eb7c \u0111\u1ecbnh, d\u00f9 \u0111\u00f3 l\u00e0 d\u1eebng kh\u1ea9n c\u1ea5p, kh\u00f3a b\u1ea3o v\u1ec7, ng\u1eaft qu\u00e1 nhi\u1ec7t, hay ng\u1eaft m\u1ee9c th\u1ea5p, c\u00e1c k\u1ef9 s\u01b0 s\u1eed d\u1ee5ng ph\u01b0\u01a1ng ph\u00e1p ti\u1ebfp \u0111i\u1ec3m N\/C \u0111\u1ec3 m\u00e1y d\u1eebng ho\u1ea1t \u0111\u1ed9ng trong tr\u01b0\u1eddng h\u1ee3p \u0111\u1ee9t d\u00e2y ho\u1eb7c khi h\u1ec7 th\u1ed1ng m\u1ea5t ngu\u1ed3n. N\u1ebfu b\u1ea1n \u0111ang thi\u1ebft k\u1ebf m\u1ea1ch v\u00e0 ngh\u0129 \u0111\u1ebfn vi\u1ec7c s\u1eed d\u1ee5ng ti\u1ebfp \u0111i\u1ec3m N\/O trong c\u00e1c \u1ee9ng d\u1ee5ng an to\u00e0n, t\u1ed1t h\u01a1n h\u1ebft h\u00e3y d\u1eebng l\u1ea1i v\u00e0 suy ngh\u0129 v\u1ec1 \u0111i\u1ec1u g\u00ec s\u1ebd x\u1ea3y ra n\u1ebfu d\u00e2y d\u1eabn \u0111\u1ebfn \u0111\u00f3 b\u1ecb c\u1eaft.<\/p>\n<h2>L\u00e0m th\u1ebf n\u00e0o \u0111\u1ec3 ki\u1ec3m tra ti\u1ebfp \u0111i\u1ec3m N\/O?<\/h2>\n<p>Vi\u1ec7c ki\u1ec3m tra tr\u1ea1ng th\u00e1i c\u1ee7a ti\u1ebfp \u0111i\u1ec3m N\/O kh\u00e1 \u0111\u01a1n gi\u1ea3n v\u1edbi s\u1ef1 tr\u1ee3 gi\u00fap c\u1ee7a \u0111\u1ed3ng h\u1ed3 v\u1ea1n n\u0103ng, \u0111\u1eb7t \u1edf ch\u1ebf \u0111\u1ed9 \u0111o th\u00f4ng m\u1ea1ch (ho\u1eb7c \u0111i\u1ec7n tr\u1edf), v\u00ec \u0111i\u1ec1u n\u00e0y gi\u00fap x\u00e1c \u0111\u1ecbnh c\u1ea3 tr\u1ea1ng th\u00e1i c\u1ee7a ti\u1ebfp \u0111i\u1ec3m khi kh\u00f4ng k\u00edch ho\u1ea1t v\u00e0 hi\u1ec7u su\u1ea5t c\u1ee7a n\u00f3 t\u1ea1i th\u1eddi \u0111i\u1ec3m \u0111\u00f3:<\/p>\n<ul>\n<li>Ng\u1eaft ngu\u1ed3n \u0111i\u1ec7n kh\u1ecfi m\u1ea1ng l\u01b0\u1edbi v\u00e0 \u0111\u1ea3m b\u1ea3o r\u1eb1ng ti\u1ebfp \u0111i\u1ec3m kh\u00f4ng \u0111\u01b0\u1ee3c k\u1ebft n\u1ed1i v\u1edbi m\u1ea1ch \u0111ang c\u00f3 \u0111i\u1ec7n.<\/li>\n<li>\u0110\u1eb7t m\u1ed9t que \u0111o l\u00ean m\u1ed7i \u0111\u1ea7u c\u1ef1c c\u1ee7a ti\u1ebfp \u0111i\u1ec3m. Ti\u1ebfp \u0111i\u1ec3m N\/O \u0111\u01b0\u1ee3c cho l\u00e0 kh\u00f4ng cho th\u00f4ng m\u1ea1ch (\u0111i\u1ec7n tr\u1edf v\u00f4 c\u1ef1c) \u1edf v\u1ecb tr\u00ed ngh\u1ec9, ngh\u0129a l\u00e0 c\u00e1c \u0111\u1ea7u c\u1ef1c ti\u1ebfp \u0111i\u1ec3m \u0111\u01b0\u1ee3c t\u00e1ch r\u1eddi.<\/li>\n<li>K\u00edch ho\u1ea1t thi\u1ebft b\u1ecb. Nh\u1ea5n n\u00fat c\u1ea7n thi\u1ebft, ho\u1eb7c c\u1ea5p \u0111i\u1ec7n \u00e1p \u0111\u1ecbnh m\u1ee9c cho cu\u1ed9n d\u00e2y r\u01a1 le, k\u00edch ho\u1ea1t phao, ho\u1eb7c t\u00e1c \u0111\u1ed9ng c\u1ea7n gi\u1edbi h\u1ea1n. \u0110\u1ed3ng h\u1ed3 v\u1ea1n n\u0103ng s\u1ebd k\u00eau b\u00edp m\u1ed9t l\u1ea7n n\u1eefa (hi\u1ec3n th\u1ecb \u0111i\u1ec7n tr\u1edf r\u1ea5t th\u1ea5p), x\u00e1c nh\u1eadn r\u1eb1ng ti\u1ebfp \u0111i\u1ec3m \u0111\u00e3 \u0111\u00f3ng.<\/li>\n<li>Th\u1ea3 t\u00e1c \u0111\u1ed9ng, v\u00e0 \u0111\u1ed3ng h\u1ed3 v\u1ea1n n\u0103ng s\u1ebd kh\u00f4ng hi\u1ec3n th\u1ecb th\u00f4ng m\u1ea1ch ti\u1ebfp \u0111i\u1ec3m n\u1eefa.<\/li>\n<\/ul>\n<p>N\u1ebfu ti\u1ebfp \u0111i\u1ec3m N\/O hi\u1ec3n th\u1ecb th\u00f4ng m\u1ea1ch khi kh\u00f4ng k\u00edch ho\u1ea1t, ho\u1eb7c kh\u00f4ng hi\u1ec3n th\u1ecb th\u00f4ng m\u1ea1ch khi \u0111\u01b0\u1ee3c k\u00edch ho\u1ea1t, th\u00ec n\u00f3 \u0111ang \u1edf v\u1ecb tr\u00ed h\u00e0n d\u00ednh, ch\u00e1y ho\u1eb7c k\u1eb9t, v\u00e0 c\u1ea7n \u0111\u01b0\u1ee3c thay th\u1ebf thay v\u00ec s\u1eeda ch\u1eefa. Ki\u1ec3m tra t\u01b0\u01a1ng t\u1ef1 tr\u00ean ti\u1ebfp \u0111i\u1ec3m N\/C s\u1ebd cho k\u1ebft qu\u1ea3 ng\u01b0\u1ee3c l\u1ea1i: th\u00f4ng m\u1ea1ch khi kh\u00f4ng k\u00edch ho\u1ea1t v\u00e0 m\u1ea1ch h\u1edf khi \u0111\u01b0\u1ee3c k\u00edch ho\u1ea1t.<\/p>\n<h2>N\/O c\u00f2n \u0111\u01b0\u1ee3c g\u1ecdi b\u1eb1ng nh\u1eefng thu\u1eadt ng\u1eef n\u00e0o kh\u00e1c?<\/h2>\n<p>Kh\u00e1i ni\u1ec7m N\/O ph\u1ed5 bi\u1ebfn trong nhi\u1ec1u ng\u00e0nh c\u00f4ng nghi\u1ec7p; do \u0111\u00f3, b\u1ea1n s\u1ebd g\u1eb7p c\u00f9ng m\u1ed9t kh\u00e1i ni\u1ec7m d\u01b0\u1edbi c\u00e1c h\u00ecnh th\u1ee9c kh\u00e1c nhau:<\/p>\n<ul>\n<li>Ti\u1ebfp \u0111i\u1ec3m d\u1ea1ng A \u2014 \u0110\u00e2y l\u00e0 thu\u1eadt ng\u1eef trong ph\u1ea7n r\u01a1 le ch\u1ec9 ti\u1ebfp \u0111i\u1ec3m N\/O c\u1ee7a r\u01a1 le.<\/li>\n<li>Ti\u1ebfp \u0111i\u1ec3m d\u1ea1ng B \u2014 \u0110\u00e2y l\u00e0 thu\u1eadt ng\u1eef d\u00f9ng cho ti\u1ebfp \u0111i\u1ec3m N\/C.<\/li>\n<li>Ti\u1ebfp \u0111i\u1ec3m d\u1ea1ng C \u2014 \u0110\u00e2y l\u00e0 ti\u1ebfp \u0111i\u1ec3m chuy\u1ec3n \u0111\u1ed5i (SPDT).<\/li>\n<li>C\u00f4ng t\u1eafc SPST-NO \u2014 N\u00f3 ch\u1ec9 v\u1ec1 r\u01a1 le m\u1ed9t c\u1ef1c m\u1ed9t n\u00e9m v\u1edbi m\u1ea1ch th\u01b0\u1eddng m\u1edf.<\/li>\n<li>Ti\u1ebfp \u0111i\u1ec3m \u0111\u00f3ng \u2014 Thu\u1eadt ng\u1eef c\u0169 trong h\u1ec7 th\u1ed1ng \u0111i\u1ec1u khi\u1ec3n d\u00f9ng \u0111\u1ec3 ch\u1ec9 ti\u1ebfp \u0111i\u1ec3m N\/O nh\u01b0 \u201cm\u1ea1ch \u0111\u00f3ng.\u201d<\/li>\n<li>NO \/ NC \u0111\u01b0\u1ee3c in tr\u00ean thi\u1ebft b\u1ecb \u2014 Ch\u00fang ta th\u01b0\u1eddng th\u1ea5y \u2018NO\/ NC\u2019 \u0111\u01b0\u1ee3c \u0111\u00f3ng d\u1ea5u \u0111\u1ec3 ch\u1ec9 r\u1eb1ng thi\u1ebft b\u1ecb \u0111i\u1ec7n ch\u1ee9a ti\u1ebfp \u0111i\u1ec3m N\/O ho\u1eb7c N\/C.<\/li>\n<\/ul>\n<p>\u0110i\u1ec1u b\u1ea1n c\u1ea7n l\u01b0u \u00fd l\u00e0 N\/O \u0111\u1ea1i di\u1ec7n cho m\u1ed9t ti\u1ebfp \u0111i\u1ec3m ch\u1ee9 kh\u00f4ng ph\u1ea3i m\u1ed9t thi\u1ebft b\u1ecb. Chu\u00f4ng c\u1eeda kh\u00f4ng \u0111\u01a1n gi\u1ea3n \u0111\u01b0\u1ee3c g\u1ecdi l\u00e0 \u201cthi\u1ebft b\u1ecb N\/O\u201d, v\u00ec n\u00f3 \u0111\u01b0\u1ee3c \u0111\u1ecbnh ngh\u0129a c\u1ee5 th\u1ec3 h\u01a1n l\u00e0 m\u1ed9t thi\u1ebft b\u1ecb bao g\u1ed3m m\u1ed9t ti\u1ebfp \u0111i\u1ec3m N\/O. Tuy nhi\u00ean, b\u1ea1n c\u00f3 th\u1ec3 m\u00f4 t\u1ea3 \u201cti\u1ebfp \u0111i\u1ec3m kh\u00f4\u201d nh\u01b0 m\u1ed9t ngo\u1ea1i l\u1ec7 cho \u0111i\u1ec1u n\u00e0y.<\/p>\n<h2>C\u00e2u h\u1ecfi th\u01b0\u1eddng g\u1eb7p<\/h2>\n<h3>\u201cNormally open\u201d c\u00f3 ngh\u0129a l\u00e0 g\u00ec?<\/h3>\n<p>Trong s\u1eed d\u1ee5ng k\u1ef9 thu\u1eadt, normally open, hay N\/O, m\u00f4 t\u1ea3 m\u1ed9t c\u00f4ng t\u1eafc ho\u1eb7c ti\u1ebfp \u0111i\u1ec3m lu\u00f4n \u1edf tr\u1ea1ng th\u00e1i m\u1edf tr\u1eeb khi \u0111\u01b0\u1ee3c k\u00edch ho\u1ea1t \u0111\u1ec3 \u0111\u00f3ng. N\u00f3 \u0111\u01b0\u1ee3c s\u1eed d\u1ee5ng \u0111\u1ec3 ch\u1ec9 c\u00e1c thi\u1ebft b\u1ecb \u0111i\u1ec7n, cho ph\u00e9p d\u00f2ng \u0111i\u1ec7n c\u1ee7a ch\u00fang ch\u1ea3y qua m\u1ea1ch ch\u1ec9 khi c\u00f4ng t\u1eafc \u0111\u01b0\u1ee3c k\u00edch ho\u1ea1t, v\u1edbi c\u00f4ng t\u1eafc tr\u1edf l\u1ea1i v\u1ecb tr\u00ed m\u1edf khi \u0111\u01b0\u1ee3c th\u1ea3 ra kh\u1ecfi v\u1ecb tr\u00ed ho\u1ea1t \u0111\u1ed9ng. Ti\u1ebfp \u0111i\u1ec3m normally open c\u00f3 th\u1ec3 \u0111\u01b0\u1ee3c t\u00ecm th\u1ea5y c\u00f9ng v\u1edbi ti\u1ebfp \u0111i\u1ec3m normally closed, v\u1ed1n lu\u00f4n ho\u1ea1t \u0111\u1ed9ng tr\u1eeb khi b\u1ecb t\u1eaft ho\u1eb7c th\u1ea3 ra b\u1edfi c\u01a1 ch\u1ebf c\u00f4ng t\u1eafc.<\/p>\n<h3>NO trong thu\u1eadt ng\u1eef \u0111i\u1ec7n l\u00e0 g\u00ec?<\/h3>\n<p>NO l\u00e0 vi\u1ebft t\u1eaft c\u1ee7a normally open. N\u00f3i m\u1ed9t c\u00e1ch \u0111\u01a1n gi\u1ea3n, n\u00f3 \u0111\u1ecbnh ngh\u0129a m\u1ed9t ti\u1ebfp \u0111i\u1ec3m normally open lu\u00f4n t\u1ed3n t\u1ea1i \u1edf v\u1ecb tr\u00ed kh\u00f4ng k\u00edch ho\u1ea1t, c\u00f3 ngh\u0129a l\u00e0 m\u1ea1ch ch\u1ec9 c\u00f3 th\u1ec3 ho\u00e0n th\u00e0nh khi \u0111\u01b0\u1ee3c k\u00edch ho\u1ea1t. Do \u0111\u00f3, n\u1ebfu m\u1ed9t th\u1ee3 \u0111i\u1ec7n g\u1eb7p m\u1ed9t \u0111\u1ea7u n\u1ed1i \u0111\u01b0\u1ee3c ghi nh\u00e3n NO, anh ta nh\u1eadn ra r\u1eb1ng \u0111\u1ea7u n\u1ed1i \u0111\u00f3 k\u1ebft n\u1ed1i v\u1edbi m\u1ed9t c\u00f4ng t\u1eafc \u0111\u00f3ng khi h\u1ec7 th\u1ed1ng \u0111ang ho\u1ea1t \u0111\u1ed9ng.<\/p>\n<h3>Terminal chung l\u00e0 g\u00ec?<\/h3>\n<p>M\u00f4 t\u1ea3 \u0111\u01a1n gi\u1ea3n nh\u1ea5t, terminal chung, vi\u1ebft t\u1eaft l\u00e0 COM ho\u1eb7c C, ch\u1ec9 m\u1ed9t \u0111\u1ea7u n\u1ed1i k\u1ebft n\u1ed1i v\u1edbi ti\u1ebfp \u0111i\u1ec3m normally open v\u00e0 normally closed c\u1ee7a m\u1ed9t c\u00f4ng t\u1eafc chuy\u1ec3n \u0111\u1ed5i. B\u1eb1ng c\u00e1ch thay \u0111\u1ed5i tr\u1ea1ng th\u00e1i k\u00edch ho\u1ea1t c\u1ee7a cu\u1ed9n d\u00e2y \u0111i\u1ec1u khi\u1ec3n ti\u1ebfp \u0111i\u1ec3m b\u00ecnh th\u01b0\u1eddng, terminal chung s\u1ebd k\u1ebft n\u1ed1i m\u1ea1ch v\u1edbi ti\u1ebfp \u0111i\u1ec3m normally open khi c\u00f3 \u0111i\u1ec7n ho\u1eb7c ti\u1ebfp \u0111i\u1ec3m normally closed khi kh\u00f4ng c\u00f3 \u0111i\u1ec7n.<\/p>\n<h3>Lo\u1ea1i ti\u1ebfp \u0111i\u1ec3m normally closed c\u00f3 ngh\u0129a l\u00e0 g\u00ec?<\/h3>\n<p>Normally closed, vi\u1ebft t\u1eaft l\u00e0 N\/C, c\u00f3 ngh\u0129a l\u00e0 m\u1ea1ch \u0111i\u1ec7n ho\u00e0n ch\u1ec9nh v\u00e0 d\u00f2ng \u0111i\u1ec7n \u0111ang ch\u1ea3y qua c\u00e1c \u0111\u01b0\u1eddng d\u00e2y tr\u1eeb khi b\u1ecb gi\u00e1n \u0111o\u1ea1n. Ti\u1ebfp \u0111i\u1ec3m N\/C \u0111\u01b0\u1ee3c s\u1eed d\u1ee5ng trong c\u00e1c thi\u1ebft b\u1ecb nh\u01b0 n\u00fat d\u1eebng, kh\u00f3a li\u00ean \u0111\u1ed9ng v\u00e0 b\u00e1o \u0111\u1ed9ng v\u00ec h\u1ec7 th\u1ed1ng ho\u1ea1t \u0111\u1ed9ng mi\u1ec5n l\u00e0 c\u00f3 \u0111i\u1ec7n ch\u1ea1y qua d\u00e2y.<\/p>\n<h2>T\u00e0i li\u1ec7u tham kh\u1ea3o<\/h2>\n<ul>\n<li><a href=\"https:\/\/www.eaton.com\/\" rel=\"nofollow noopener\" target=\"_blank\">Eaton \u2014 Nguy\u00ean l\u00fd \u0111i\u1ec1u khi\u1ec3n c\u00f4ng nghi\u1ec7p v\u00e0 r\u01a1 le<\/a><\/li>\n<li><a href=\"https:\/\/www.rockwellautomation.com\/\" rel=\"nofollow noopener\" target=\"_blank\">Rockwell Automation \u2014 Logic thang v\u00e0 c\u01a1 b\u1ea3n v\u1ec1 ti\u1ebfp \u0111i\u1ec3m<\/a><\/li>\n<li><a href=\"https:\/\/www.ia.omron.com\/\" rel=\"nofollow noopener\" target=\"_blank\">Omron \u2014 H\u01b0\u1edbng d\u1eabn k\u1ef9 thu\u1eadt: Ti\u1ebfp \u0111i\u1ec3m r\u01a1 le v\u00e0 c\u00f4ng t\u1eafc<\/a><\/li>\n<\/ul>\n<h2>K\u1ebft lu\u1eadn<\/h2>\n<p>N\/O l\u00e0 m\u1ed9t trong nh\u1eefng ch\u1eef vi\u1ebft t\u1eaft nh\u1ecf gi\u1ea3i th\u00edch r\u1ea5t nhi\u1ec1u v\u1ec1 c\u00e1ch ho\u1ea1t \u0111\u1ed9ng c\u1ee7a \u0111i\u1ec1u khi\u1ec3n \u0111i\u1ec7n. N\u00f3 \u0111\u1ec1 c\u1eadp \u0111\u1ebfn m\u1ed9t ti\u1ebfp \u0111i\u1ec3m th\u01b0\u1eddng m\u1edf nh\u01b0ng \u0111\u00f3ng khi c\u1ea7n thi\u1ebft. \u0110i\u1ec1u n\u00e0y c\u00f3 th\u1ec3 \u0111\u1ec1 c\u1eadp \u0111\u1ebfn n\u00fat kh\u1edfi \u0111\u1ed9ng b\u1ea1n nh\u1ea5n, ti\u1ebfp \u0111i\u1ec3m r\u01a1 le, c\u00f4ng t\u1eafc phao k\u00edch ho\u1ea1t b\u01a1m khi b\u1ec3 ch\u1ee9a r\u1ed7ng, v\u00e0 ti\u1ebfp \u0111i\u1ec3m ph\u1ee5 b\u00e1o hi\u1ec7u r\u1eb1ng b\u1ed9 ng\u1eaft m\u1ea1ch \u0111\u00e3 nh\u1ea3y. N\u00f3 \u0111\u01b0\u1ee3c minh h\u1ecda trong s\u01a1 \u0111\u1ed3 nh\u01b0 m\u1ed9t khe h\u1edf nh\u1ecf tr\u00ean \u0111\u01b0\u1eddng d\u00e2y, v\u00e0 trong thu\u1eadt ng\u1eef logic, n\u00f3 \u0111\u1ec1 c\u1eadp \u0111\u1ebfn \u201ck\u00edch ho\u1ea1t m\u1ed9t s\u1ef1 ki\u1ec7n x\u1ea3y ra,\u201d \u0111i\u1ec1u n\u00e0y tr\u00e1i ng\u01b0\u1ee3c v\u1edbi ch\u1eef vi\u1ebft t\u1eaft N\/C, th\u01b0\u1eddng \u0111\u00f3ng v\u00e0 m\u1edf khi c\u1ea7n thi\u1ebft. Ti\u1ebfp \u0111i\u1ec3m N\/O c\u00f3 th\u1ec3 \u0111\u01b0\u1ee3c ki\u1ec3m tra \u0111\u1ed9 li\u00ean t\u1ee5c, trong khi t\u1ed1t h\u01a1n l\u00e0 nh\u1edb c\u00e1c t\u00ean k\u1ef9 thu\u1eadt kh\u00e1c nhau c\u1ee7a ch\u00fang (Form A, SPST-NO). L\u1eddi khuy\u00ean ch\u00ednh l\u00e0 kh\u00f4ng qu\u00ean quy t\u1eafc r\u1eb1ng khi c\u00f3 b\u1ea5t k\u1ef3 nguy c\u01a1 g\u00e2y th\u01b0\u01a1ng t\u00edch ho\u1eb7c h\u01b0 h\u1ea1i n\u00e0o, m\u1ea1ch n\u00ean \u0111\u01b0\u1ee3c t\u1ea1o qua c\u00e1c ti\u1ebfp \u0111i\u1ec3m N\/C, thay v\u00ec s\u1eed d\u1ee5ng c\u00e1c ti\u1ebfp \u0111i\u1ec3m N\/O. C\u1ea7n l\u01b0u \u00fd r\u1eb1ng ngu\u1ed3n \u0111i\u1ec1u khi\u1ec3n v\u00e0 ngu\u1ed3n \u0111i\u1ec7n c\u1ea7n cho qu\u00e1 tr\u00ecnh v\u1eadn h\u00e0nh y\u00eau c\u1ea7u c\u00e1c lo\u1ea1i b\u1ea3o v\u1ec7 kh\u00e1c nhau. Th\u00f4ng tin v\u1ec1 vi\u1ec7c s\u1eed d\u1ee5ng b\u1ed9 ng\u1eaft m\u1ea1ch m\u1ed9t c\u1ef1c so v\u1edbi b\u1ed9 ng\u1eaft m\u1ea1ch hai c\u1ef1c c\u00f3 th\u1ec3 \u0111\u01b0\u1ee3c t\u00ecm th\u1ea5y trong ph\u1ea7n li\u00ean quan c\u1ee7a trang web n\u00e0y.<\/p>","protected":false},"excerpt":{"rendered":"<p>This guide is meant for anyone who have had experience with electrical schematics and has encountered the abbreviation N\/O, or NO, when reading relay datasheets or examining terminals on contactors. N\/O is one of the most widely used abbreviations in electrical engineering today, as well as an important part of making control systems, relays, contactors, [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":4116,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_gspb_post_css":"","footnotes":""},"categories":[1],"tags":[],"class_list":["post-4111","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\/4111","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=4111"}],"version-history":[{"count":3,"href":"https:\/\/huyuglobal.com\/vi\/wp-json\/wp\/v2\/posts\/4111\/revisions"}],"predecessor-version":[{"id":4123,"href":"https:\/\/huyuglobal.com\/vi\/wp-json\/wp\/v2\/posts\/4111\/revisions\/4123"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/huyuglobal.com\/vi\/wp-json\/wp\/v2\/media\/4116"}],"wp:attachment":[{"href":"https:\/\/huyuglobal.com\/vi\/wp-json\/wp\/v2\/media?parent=4111"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/huyuglobal.com\/vi\/wp-json\/wp\/v2\/categories?post=4111"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/huyuglobal.com\/vi\/wp-json\/wp\/v2\/tags?post=4111"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}