{"id":8721,"date":"2025-09-27T05:53:57","date_gmt":"2025-09-27T05:53:57","guid":{"rendered":"https:\/\/cntnmcb.com\/?p=8721"},"modified":"2025-09-29T07:00:32","modified_gmt":"2025-09-29T07:00:32","slug":"miniature-circuit-breaker-working-principle","status":"publish","type":"post","link":"https:\/\/cntnmcb.com\/pt\/miniature-circuit-breaker-working-principle\/","title":{"rendered":"Princ\u00edpio de funcionamento do disjuntor miniatura"},"content":{"rendered":"<div data-elementor-type=\"wp-post\" data-elementor-id=\"8721\" class=\"elementor elementor-8721\" data-elementor-post-type=\"post\">\n\t\t\t\t<div class=\"elementor-element elementor-element-54dd356 e-flex e-con-boxed e-con e-parent\" data-id=\"54dd356\" data-element_type=\"container\" data-e-type=\"container\">\n\t\t\t\t\t<div class=\"e-con-inner\">\n\t\t\t\t<div class=\"elementor-element elementor-element-bd6ed86 elementor-widget elementor-widget-text-editor\" data-id=\"bd6ed86\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t<p><span style=\"font-weight: 400;\">O <\/span><a href=\"https:\/\/cntnmcb.com\/pt\/miniature-circuit-breaker\/\"><span style=\"font-weight: 400;\">disjuntor em miniatura (MCB)<\/span><\/a><span style=\"font-weight: 400;\"> \u00e9 o principal dispositivo de prote\u00e7\u00e3o entre os dispositivos de prote\u00e7\u00e3o de corrente em sistemas de distribui\u00e7\u00e3o de energia de baixa tens\u00e3o.\u00a0<\/span><\/p><p><span style=\"font-weight: 400;\">Quando ocorrer um curto-circuito ou uma sobrecarga no circuito, ele cortar\u00e1 automaticamente a fonte de alimenta\u00e7\u00e3o para garantir a seguran\u00e7a do equipamento el\u00e9trico e evitar perdas de propriedade e les\u00f5es pessoais causadas por inc\u00eandios el\u00e9tricos.<\/span><\/p><p><span style=\"font-weight: 400;\">Em seguida, ser\u00e1 apresentada uma vis\u00e3o geral detalhada do princ\u00edpio de funcionamento do disjuntor em miniatura (MCB).<\/span><\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-48795ae elementor-widget elementor-widget-image\" data-id=\"48795ae\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"image.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t<img fetchpriority=\"high\" decoding=\"async\" width=\"1024\" height=\"512\" src=\"https:\/\/cntnmcb.com\/wp-content\/uploads\/2025\/09\/DZ47-NEITU.webp\" class=\"attachment-large size-large wp-image-8609\" alt=\"Diagrama esquem\u00e1tico da estrutura do disjuntor miniatura\" srcset=\"https:\/\/cntnmcb.com\/wp-content\/uploads\/2025\/09\/DZ47-NEITU.webp 1024w, https:\/\/cntnmcb.com\/wp-content\/uploads\/2025\/09\/DZ47-NEITU-600x300.webp 600w, https:\/\/cntnmcb.com\/wp-content\/uploads\/2025\/09\/DZ47-NEITU-64x32.webp 64w\" sizes=\"(max-width: 1024px) 100vw, 1024px\" \/>\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-578cd3f elementor-widget elementor-widget-heading\" data-id=\"578cd3f\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"heading.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t<h2 class=\"elementor-heading-title elementor-size-default\">Componentes principais e fun\u00e7\u00f5es dos disjuntores miniatura (MCBs)<\/h2>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-3e6d7a5 elementor-widget elementor-widget-text-editor\" data-id=\"3e6d7a5\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t<ul><li><span style=\"font-weight: 400;\">A fun\u00e7\u00e3o de um rel\u00e9 \u00e9 identificar falhas e acionar a desconex\u00e3o: Quando o circuito est\u00e1 operando normalmente, o rel\u00e9 fica em um estado inativo e n\u00e3o interfere no status de ligado\/desligado do circuito.<\/span><\/li><\/ul><p>\u00a0<\/p><p><span style=\"font-weight: 400;\">Quando detecta corrente\/tens\u00e3o anormal no circuito (como corrente excessiva durante sobrecarga, surto repentino de corrente durante curto-circuito ou corrente desequilibrada entre o fio energizado e o fio neutro durante fuga), ele pressiona o mecanismo de travamento do disjuntor em miniatura (MCB) para liberar, fazendo com que os contatos m\u00f3veis e est\u00e1ticos do disjuntor se separem e, por fim, cortem a fonte de alimenta\u00e7\u00e3o.<\/span><\/p><p>\u00a0<\/p><ul><li><span style=\"font-weight: 400;\">Mecanismo operacional (centro de execu\u00e7\u00e3o da a\u00e7\u00e3o): Consiste em componentes-chave, como bielas e molas, que formam um sistema de liga\u00e7\u00e3o. Serve para conectar o \"sinal de disparo do tripper\" e a \"a\u00e7\u00e3o de contato liga-desliga\", permitindo opera\u00e7\u00f5es bidirecionais, incluindo \"fechamento\/abertura manual\" e \"disparo autom\u00e1tico em caso de falhas\".<\/span><\/li><\/ul><p>\u00a0<\/p><ul><li><span style=\"font-weight: 400;\">O sistema de contato \u00e9 o componente executivo condutor e liga-desliga de um disjuntor em miniatura (MCB). Durante a opera\u00e7\u00e3o normal do circuito, o sistema de contato funciona como o canal principal para a corrente. Quando ocorre uma sobrecarga ou um curto-circuito no circuito, depois que o mecanismo de disparo \u00e9 acionado, o sistema de contato executa imediatamente uma \"a\u00e7\u00e3o de desconex\u00e3o\": ele separa rapidamente os contatos para cortar a corrente e, ao mesmo tempo, pode extinguir o arco gerado quando a corrente de corte \u00e9 grande, evitando assim que o circuito seja interrompido.<\/span><span style=\"font-weight: 400;\">de danos por arco el\u00e9trico.<\/span><\/li><\/ul><p>\u00a0<\/p><ul><li><span style=\"font-weight: 400;\">C\u00e2mara de extin\u00e7\u00e3o de arco (garantia de interrup\u00e7\u00e3o segura): \u00c9 feita inteiramente de materiais retardadores de chamas. Pode extinguir rapidamente o arco el\u00e9trico gerado quando os contatos se separam, evitando a quebra do arco e a queima de componentes e garantindo a interrup\u00e7\u00e3o segura do circuito.<\/span><\/li><\/ul><p>\u00a0<\/p><ul><li><span style=\"font-weight: 400;\">Gabinete (estrutura b\u00e1sica de prote\u00e7\u00e3o): Isola fisicamente os componentes internos do ambiente externo, evitando choques el\u00e9tricos, poeira e umidade, de modo a garantir a opera\u00e7\u00e3o est\u00e1vel do pr\u00f3prio dispositivo.<\/span><\/li><\/ul><p>\u00a0<\/p><p><span style=\"font-weight: 400;\">Em seguida, uma vis\u00e3o geral detalhada do princ\u00edpio de funcionamento do <\/span><a href=\"https:\/\/cntnmcb.com\/pt\/produto\/20a-mini-breaker-dz47-63\/\"><span style=\"font-weight: 400;\">disjuntor em miniatura (MCB)<\/span><\/a><span style=\"font-weight: 400;\"> ser\u00e1 fornecido.<\/span><\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-65cad1d elementor-widget elementor-widget-heading\" data-id=\"65cad1d\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"heading.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t<h2 class=\"elementor-heading-title elementor-size-default\">Processo de funcionamento dos disjuntores miniatura (MCBs)<\/h2>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-32e7a9d elementor-widget elementor-widget-video\" data-id=\"32e7a9d\" data-element_type=\"widget\" data-e-type=\"widget\" data-settings=\"{&quot;youtube_url&quot;:&quot;https:\\\/\\\/www.youtube.com\\\/watch?v=SNBfppriDjc&quot;,&quot;video_type&quot;:&quot;youtube&quot;,&quot;controls&quot;:&quot;yes&quot;}\" data-widget_type=\"video.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t<div class=\"elementor-wrapper elementor-open-inline\">\n\t\t\t<div class=\"elementor-video\"><\/div>\t\t<\/div>\n\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-f78431f elementor-widget elementor-widget-heading\" data-id=\"f78431f\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"heading.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t<h3 class=\"elementor-heading-title elementor-size-default\">1. Estado de opera\u00e7\u00e3o normal<\/h3>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-f2e7fe7 elementor-widget elementor-widget-text-editor\" data-id=\"f2e7fe7\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t<p><span style=\"font-weight: 400;\">Quando o disjuntor est\u00e1 em opera\u00e7\u00e3o normal, a corrente flui pelo caminho regular de condu\u00e7\u00e3o: terminal de entrada \u2192 contato fixo \u2192 contato m\u00f3vel \u2192 terminal de sa\u00edda.\u00a0<\/span><\/p><p><span style=\"font-weight: 400;\">Durante esse per\u00edodo, o tripper permanece inativo, o mecanismo de opera\u00e7\u00e3o permanece na posi\u00e7\u00e3o fechada e os contatos mant\u00eam um estado est\u00e1vel de contato apertado.<\/span><\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-9950d4f elementor-widget elementor-widget-heading\" data-id=\"9950d4f\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"heading.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t<h3 class=\"elementor-heading-title elementor-size-default\">2. Princ\u00edpio de prote\u00e7\u00e3o contra sobrecarga<\/h3>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-b7b9948 elementor-widget elementor-widget-text-editor\" data-id=\"b7b9948\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t<p><span style=\"font-weight: 400;\">Quando o disparador t\u00e9rmico gera calor excessivo devido \u00e0 \"corrente de sobrecarga\", a tira bimet\u00e1lica se dobra com o calor. A tira bimet\u00e1lica dobrada empurra a haste de conex\u00e3o do mecanismo de opera\u00e7\u00e3o, quebrando o equil\u00edbrio do mecanismo.\u00a0<\/span><\/p><p><span style=\"font-weight: 400;\">O mecanismo de opera\u00e7\u00e3o faz com que o contato m\u00f3vel e o contato fixo se separem rapidamente, interrompendo assim o circuito sobrecarregado.<\/span><\/p><p><span style=\"font-weight: 400;\">\u00a0Depois que a tira bimet\u00e1lica esfriar e se restabelecer, o circuito pode ser restaurado para a condu\u00e7\u00e3o operando-se manualmente a alavanca para fechar o disjuntor.<\/span><\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-87042c1 elementor-widget elementor-widget-heading\" data-id=\"87042c1\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"heading.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t<h3 class=\"elementor-heading-title elementor-size-default\">3. Princ\u00edpio de prote\u00e7\u00e3o contra curto-circuito<\/h3>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-b818ff8 elementor-widget elementor-widget-text-editor\" data-id=\"b818ff8\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t<p><span style=\"font-weight: 400;\">Quando ocorre um curto-circuito no circuito, o aumento repentino da corrente faz com que a bobina do tripper eletromagn\u00e9tico gere um forte campo magn\u00e9tico, que atrai a armadura para agir rapidamente.\u00a0<\/span><\/p><p><span style=\"font-weight: 400;\">A armadura atinge o mecanismo de opera\u00e7\u00e3o, rompendo instantaneamente o equil\u00edbrio fechado.<\/span><\/p><p><span style=\"font-weight: 400;\">Os contatos se separam rapidamente, e a c\u00e2mara de extin\u00e7\u00e3o de arco extingue o arco el\u00e9trico simultaneamente, evitando que a corrente de curto-circuito danifique continuamente o equipamento.\u00a0<\/span><\/p><p><span style=\"font-weight: 400;\">Depois que a falha de curto-circuito for eliminada, o mecanismo operacional dever\u00e1 ser reiniciado manualmente para garantir que a falha seja completamente resolvida antes que a fonte de alimenta\u00e7\u00e3o seja restaurada.<\/span><\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-2a66dec elementor-widget elementor-widget-heading\" data-id=\"2a66dec\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"heading.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t<h2 class=\"elementor-heading-title elementor-size-default\">4. Processo de reinicializa\u00e7\u00e3o ap\u00f3s a elimina\u00e7\u00e3o da falha<\/h2>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-769922c elementor-widget elementor-widget-text-editor\" data-id=\"769922c\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t<ul><li><span style=\"font-weight: 400;\">Ele aumenta a seguran\u00e7a do uso dom\u00e9stico de eletricidade, evitando inc\u00eandios causados por curtos-circuitos na linha devido \u00e0 sobrecarga de eletrodom\u00e9sticos e protegendo a seguran\u00e7a de pessoas e propriedades.<\/span><\/li><\/ul><ul><li><span style=\"font-weight: 400;\">Ele estabiliza a distribui\u00e7\u00e3o de energia industrial, garantindo que os equipamentos de produ\u00e7\u00e3o n\u00e3o sejam afetados por correntes anormais e reduzindo as perdas decorrentes de interrup\u00e7\u00f5es de trabalho e paradas de produ\u00e7\u00e3o.<\/span><\/li><\/ul><ul><li><span style=\"font-weight: 400;\">Ele oferece prote\u00e7\u00e3o mais abrangente para redes de energia de baixa tens\u00e3o, implementando prote\u00e7\u00e3o hier\u00e1rquica para o terminal da rede e evitando a expans\u00e3o de falhas.<\/span><\/li><\/ul><ul><li><span style=\"font-weight: 400;\">Sua fun\u00e7\u00e3o de prote\u00e7\u00e3o precisa e seu design de baixo consumo de energia permitem que suas necessidades de eletricidade operem de forma mais ecol\u00f3gica e eficiente.<\/span><\/li><\/ul>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-04cba47 elementor-widget elementor-widget-heading\" data-id=\"04cba47\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"heading.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t<h2 class=\"elementor-heading-title elementor-size-default\">Conclus\u00e3o<\/h2>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-f489933 elementor-widget elementor-widget-video\" data-id=\"f489933\" data-element_type=\"widget\" data-e-type=\"widget\" data-settings=\"{&quot;youtube_url&quot;:&quot;https:\\\/\\\/youtu.be\\\/xzEdsvabZfo&quot;,&quot;video_type&quot;:&quot;youtube&quot;,&quot;controls&quot;:&quot;yes&quot;}\" data-widget_type=\"video.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t<div class=\"elementor-wrapper elementor-open-inline\">\n\t\t\t<div class=\"elementor-video\"><\/div>\t\t<\/div>\n\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-30b64c6 elementor-widget elementor-widget-text-editor\" data-id=\"30b64c6\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t<p><span style=\"font-weight: 400;\">Em resumo, o princ\u00edpio de funcionamento de um disjuntor em miniatura (MCB) gira em torno de tr\u00eas elos principais: \"monitoramento em tempo real da corrente do circuito, resposta precisa aos sinais de falha e interrup\u00e7\u00e3o segura dos circuitos defeituosos\".\u00a0<\/span><\/p><p><span style=\"font-weight: 400;\">Por meio da coopera\u00e7\u00e3o coordenada de componentes principais, como disparadores t\u00e9rmicos, disparadores eletromagn\u00e9ticos e mecanismos operacionais, ele obt\u00e9m prote\u00e7\u00e3o precisa contra duas falhas comuns de circuito - sobrecarga e curto-circuito.\u00a0<\/span><\/p><p><span style=\"font-weight: 400;\">Em \u00faltima an\u00e1lise, isso garante a opera\u00e7\u00e3o segura dos equipamentos el\u00e9tricos e evita inc\u00eandios el\u00e9tricos na fonte.<\/span><\/p><p><a href=\"https:\/\/cntnmcb.com\/pt\/\"><b>CNTN<\/b><\/a><span style=\"font-weight: 400;\"> tem o compromisso de fabricar disjuntores em miniatura. <\/span><\/p><p><span style=\"font-weight: 400;\">Todos os disjuntores em miniatura fabricados pela CNTN s\u00f3 podem sair da f\u00e1brica depois de passarem por testes rigorosos. <\/span><a href=\"https:\/\/cntnmcb.com\/pt\/contact-us\/\"><span style=\"font-weight: 400;\">Entre em contato conosco<\/span><\/a><span style=\"font-weight: 400;\"> se voc\u00ea tiver algum requisito.<\/span><\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<\/div>","protected":false},"excerpt":{"rendered":"<p>The miniature circuit breaker (MCB) is the core protection device among current protection devices in low-voltage power distribution systems.\u00a0 When a short circuit or overload occurs in the circuit, it will automatically cut off the power supply to ensure the safety of electrical equipment and prevent property losses and personal injuries caused by electrical fires. [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":8673,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"site-sidebar-layout":"default","site-content-layout":"","ast-site-content-layout":"default","site-content-style":"default","site-sidebar-style":"default","ast-global-header-display":"","ast-banner-title-visibility":"","ast-main-header-display":"","ast-hfb-above-header-display":"","ast-hfb-below-header-display":"","ast-hfb-mobile-header-display":"","site-post-title":"","ast-breadcrumbs-content":"","ast-featured-img":"","footer-sml-layout":"","ast-disable-related-posts":"","theme-transparent-header-meta":"","adv-header-id-meta":"","stick-header-meta":"","header-above-stick-meta":"","header-main-stick-meta":"","header-below-stick-meta":"","astra-migrate-meta-layouts":"set","ast-page-background-enabled":"default","ast-page-background-meta":{"desktop":{"background-color":"","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"tablet":{"background-color":"","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"mobile":{"background-color":"","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""}},"ast-content-background-meta":{"desktop":{"background-color":"var(--ast-global-color-5)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"tablet":{"background-color":"var(--ast-global-color-5)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"mobile":{"background-color":"var(--ast-global-color-5)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""}},"footnotes":""},"categories":[1],"tags":[],"class_list":["post-8721","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-uncategorized"],"yoast_head":"<!-- This site is optimized with the Yoast SEO Premium plugin v25.0 (Yoast SEO v27.5) - https:\/\/yoast.com\/product\/yoast-seo-premium-wordpress\/ -->\n<title>Miniature Circuit Breaker Working Principle - Zhejiang CNTN Electric Co.,Ltd<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/cntnmcb.com\/pt\/miniature-circuit-breaker-working-principle\/\" \/>\n<meta property=\"og:locale\" content=\"pt_BR\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Miniature Circuit Breaker Working Principle\" \/>\n<meta property=\"og:description\" content=\"The miniature circuit breaker (MCB) is the core protection device among current protection devices in low-voltage power distribution systems.\u00a0 When a short circuit or overload occurs in the circuit, it will automatically cut off the power supply to ensure the safety of electrical equipment and prevent property losses and personal injuries caused by electrical fires. 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