1.0Zhejiang CNTN Electric Co.,Ltdhttps://cntnmcb.com/ptrich600338<blockquote class="wp-embedded-content" data-secret="yZ8XFm0J5l"><a href="https://cntnmcb.com/pt/miniature-circuit-breaker-working-principle/">Princípio de funcionamento do disjuntor miniatura</a></blockquote><iframe sandbox="allow-scripts" security="restricted" src="https://cntnmcb.com/pt/miniature-circuit-breaker-working-principle/embed/#?secret=yZ8XFm0J5l" width="600" height="338" title="“Princípio de funcionamento do disjuntor miniatura” — Zhejiang CNTN Electric Co., Ltd." data-secret="yZ8XFm0J5l" frameborder="0" marginwidth="0" marginheight="0" scrolling="no" class="wp-embedded-content"></iframe><script> /*! This file is auto-generated */ !function(d,l){"use strict";l.querySelector&&d.addEventListener&&"undefined"!=typeof URL&&(d.wp=d.wp||{},d.wp.receiveEmbedMessage||(d.wp.receiveEmbedMessage=function(e){var t=e.data;if((t||t.secret||t.message||t.value)&&!/[^a-zA-Z0-9]/.test(t.secret)){for(var s,r,n,a=l.querySelectorAll('iframe[data-secret="'+t.secret+'"]'),o=l.querySelectorAll('blockquote[data-secret="'+t.secret+'"]'),c=new RegExp("^https?:$","i"),i=0;i<o.length;i++)o[i].style.display="none";for(i=0;i<a.length;i++)s=a[i],e.source===s.contentWindow&&(s.removeAttribute("style"),"height"===t.message?(1e3<(r=parseInt(t.value,10))?r=1e3:~~r<200&&(r=200),s.height=r):"link"===t.message&&(r=new URL(s.getAttribute("src")),n=new URL(t.value),c.test(n.protocol))&&n.host===r.host&&l.activeElement===s&&(d.top.location.href=t.value))}},d.addEventListener("message",d.wp.receiveEmbedMessage,!1),l.addEventListener("DOMContentLoaded",function(){for(var e,t,s=l.querySelectorAll("iframe.wp-embedded-content"),r=0;r<s.length;r++)(t=(e=s[r]).getAttribute("data-secret"))||(t=Math.random().toString(36).substring(2,12),e.src+="#?secret="+t,e.setAttribute("data-secret",t)),e.contentWindow.postMessage({message:"ready",secret:t},"*")},!1)))}(window,document); //# sourceURL=https://cntnmcb.com/wp-includes/js/wp-embed.min.js </script>https://cntnmcb.com/wp-content/uploads/2025/09/CNTN-1.png640640The miniature circuit breaker (MCB) is the core protection device among current protection devices in low-voltage power distribution systems.  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. […]