{"id":894,"date":"2020-07-03T07:58:55","date_gmt":"2020-07-03T07:58:55","guid":{"rendered":"http:\/\/www.cselectric.co.in\/blog\/?p=894"},"modified":"2025-12-26T06:44:10","modified_gmt":"2025-12-26T06:44:10","slug":"why-does-your-mcb-trip","status":"publish","type":"post","link":"https:\/\/cselectric.co.in\/blog\/why-does-your-mcb-trip\/","title":{"rendered":"Why Does Your MCB Trip?"},"content":{"rendered":"<div id=\"ez-toc-container\" class=\"ez-toc-v2_0_80 counter-hierarchy ez-toc-counter ez-toc-custom ez-toc-container-direction\">\n<div class=\"ez-toc-title-container\">\n<p class=\"ez-toc-title\" style=\"cursor:inherit\">Table of Contents<\/p>\n<span class=\"ez-toc-title-toggle\"><a href=\"#\" class=\"ez-toc-pull-right ez-toc-btn ez-toc-btn-xs ez-toc-btn-default ez-toc-toggle\" aria-label=\"Toggle Table of Content\"><span class=\"ez-toc-js-icon-con\"><span class=\"\"><span class=\"eztoc-hide\" style=\"display:none;\">Toggle<\/span><span class=\"ez-toc-icon-toggle-span\"><svg style=\"fill: #999;color:#999\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\" class=\"list-377408\" width=\"20px\" height=\"20px\" viewBox=\"0 0 24 24\" fill=\"none\"><path d=\"M6 6H4v2h2V6zm14 0H8v2h12V6zM4 11h2v2H4v-2zm16 0H8v2h12v-2zM4 16h2v2H4v-2zm16 0H8v2h12v-2z\" fill=\"currentColor\"><\/path><\/svg><svg style=\"fill: #999;color:#999\" class=\"arrow-unsorted-368013\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"10px\" height=\"10px\" viewBox=\"0 0 24 24\" version=\"1.2\" baseProfile=\"tiny\"><path d=\"M18.2 9.3l-6.2-6.3-6.2 6.3c-.2.2-.3.4-.3.7s.1.5.3.7c.2.2.4.3.7.3h11c.3 0 .5-.1.7-.3.2-.2.3-.5.3-.7s-.1-.5-.3-.7zM5.8 14.7l6.2 6.3 6.2-6.3c.2-.2.3-.5.3-.7s-.1-.5-.3-.7c-.2-.2-.4-.3-.7-.3h-11c-.3 0-.5.1-.7.3-.2.2-.3.5-.3.7s.1.5.3.7z\"\/><\/svg><\/span><\/span><\/span><\/a><\/span><\/div>\n<nav><ul class='ez-toc-list ez-toc-list-level-1 ' ><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-1\" href=\"https:\/\/cselectric.co.in\/blog\/why-does-your-mcb-trip\/#What_is_an_MCB\" >What is an MCB?<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-2\" href=\"https:\/\/cselectric.co.in\/blog\/why-does-your-mcb-trip\/#Reasons_why_MCBs_trip\" >Reasons why MCBs trip<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-3\" href=\"https:\/\/cselectric.co.in\/blog\/why-does-your-mcb-trip\/#Miniature_Circuit_Breaker_MCB\" >Miniature Circuit Breaker (MCB)<\/a><ul class='ez-toc-list-level-3' ><li class='ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-4\" href=\"https:\/\/cselectric.co.in\/blog\/why-does-your-mcb-trip\/#MCBs_arrangement_inside_a_DB\" >MCBs arrangement inside a DB<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-5\" href=\"https:\/\/cselectric.co.in\/blog\/why-does-your-mcb-trip\/#According_to_the_type_of_curveapplications_the_MCB_is_of_3_types\" >According to the type of curve\/applications the MCB is of 3 types:<\/a><\/li><\/ul><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-6\" href=\"https:\/\/cselectric.co.in\/blog\/why-does-your-mcb-trip\/#How_to_avoid_MCBs_tripping\" >How to avoid MCBs tripping<\/a><\/li><\/ul><\/nav><\/div>\n<h2><span class=\"ez-toc-section\" id=\"What_is_an_MCB\"><\/span><strong>What is an MCB?<\/strong><span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p><span style=\"font-weight: 400;\">MCBs or Miniature Circuit Breakers are <a href=\"https:\/\/cselectric.co.in\/blog\/difference-mcb-mccb-rccb-elcb\/\">protective electromagnetic devices<\/a> that act as a switch in a circuit. They automatically open the circuit whenever they sense the current passing over the circuit has crossed a certain limit or value. The device can also be used as a normal on and off switch manually.\u00a0<\/span><\/p>\n<p><span style=\"font-weight: 400;\">MCBs are also known as time delay tripping devices which trip and shut down the system whenever there is an overcurrent flowing for a longer period of time and there is a danger to the entire circuit. However, in the case of short-circuits, these devices can trip and stop the power supply within 2.5 milliseconds.<\/span><\/p>\n<p><span style=\"font-weight: 400;\">In an electrical system \u2018Fault\u2019 is the condition which arises due to the malfunctioning of some component or wrong electrical practice. A fault may lead to a very dangerous situation such as explosion &amp; fire if not cleared timely, not only this, the amount of time for which fault remains in the system, it continuously deteriorates the system health causing high energy losses resulting in increased thermal stress upon the system. Faults are hazardous to the system &amp; require to be cleared at the earliest thus, there is a need for such a device which not only is capable of clearing the fault but also has a lower opening time in order to save the let-through energy &amp; minimize the thermal stress.<\/span><\/p>\n<p>&nbsp;<\/p>\n<h2><span class=\"ez-toc-section\" id=\"Reasons_why_MCBs_trip\"><\/span><strong>Reasons why MCBs trip<\/strong><span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p><b>Generally, 2 kinds of fault which disturb the system often are:<\/b><\/p>\n<ul>\n<li><b>Overload: <span style=\"font-weight: 400;\">An overload is a fault condition which arises in a system when a circuit draws a higher current than its rating. For example from a 6A socket if we draw 10A current the condition is said to be overload.<\/span><\/b><\/li>\n<li><b>Short Circuit:<span style=\"font-weight: 400;\"> This is a condition in which an extremely low resistance path is created due to an accidental or intentional connection between 2 or more conductors which leads to the sudden increase of current to its peak value and voltage getting minimized to an extremely lower magnitude.<\/span><\/b><\/li>\n<\/ul>\n<p>&nbsp;<\/p>\n<h2><span class=\"ez-toc-section\" id=\"Miniature_Circuit_Breaker_MCB\"><\/span><b>Miniature Circuit Breaker (MCB)<\/b><span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p><span style=\"font-weight: 400;\">MCB or<a href=\"https:\/\/cselectric.co.in\/products-solutions\/final-distribution-products\/miniature-circuit-breakers\/\"> Miniature Circuit Breaker<\/a> is a protection device which offers protection against overload &amp; short circuit. It includes a bimetal &amp; a solenoid coil which trips the MCB in case of Overload &amp; Short Circuit respectively. Complying with IEC 60898-1, MCB is used for the lower ratings from 0.5~125A.<\/span><\/p>\n<p>&nbsp;<\/p>\n<h3><span class=\"ez-toc-section\" id=\"MCBs_arrangement_inside_a_DB\"><\/span><b>MCBs arrangement inside a DB<\/b><span class=\"ez-toc-section-end\"><\/span><\/h3>\n<h3><b><a href=\"https:\/\/cselectric.co.in\/blog\/wp-content\/uploads\/2020\/07\/mcb-inside.jpg\" rel=\"mfp\"><img loading=\"lazy\" decoding=\"async\" class=\"size-full wp-image-897 aligncenter lazyload\" src=\"data:image\/gif;base64,R0lGODlhAQABAAAAACH5BAEKAAEALAAAAAABAAEAAAICTAEAOw==\" data-src=\"https:\/\/cselectric.co.in\/blog\/wp-content\/uploads\/2020\/07\/mcb-inside.jpg\" alt=\"\" width=\"523\" height=\"387\" \/><\/a>According to the type of curve\/applications the MCB is of 3 types:<\/b><\/h3>\n<ul>\n<li><b>B Curve: <span style=\"font-weight: 400;\">This type of MCB has a lower short circuit trip zone and can be used for Resistive\/ Lighting loads, for example, lights, heaters, etc.<\/span><\/b><\/li>\n<li><b>C Curve: <span style=\"font-weight: 400;\">These MCBs have a higher short circuit tripping zone and can be useful for the inductive type\/motor loads, for ex: AC, Refrigerator etc.<\/span><\/b><\/li>\n<li><b>D Curve: <span style=\"font-weight: 400;\">These MCBs have a very high short circuit tripping zone and are generally used for the loads which draw a very high starting current such as Sodium Lamps.\u00a0<\/span><\/b><\/li>\n<\/ul>\n<p>&nbsp;<\/p>\n<h2><span class=\"ez-toc-section\" id=\"How_to_avoid_MCBs_tripping\"><\/span><strong>How to avoid MCBs tripping<\/strong><span class=\"ez-toc-section-end\"><\/span><\/h2>\n<ul>\n<li style=\"font-weight: 400;\"><span style=\"font-weight: 400;\">Avoid using multi-plugs and extension cords.<\/span><\/li>\n<li style=\"font-weight: 400;\"><span style=\"font-weight: 400;\">Replace all broken &amp; damaged wires of electrical devices and appliances.\u00a0<\/span><\/li>\n<li style=\"font-weight: 400;\"><span style=\"font-weight: 400;\">Unplug all the electrical devices &amp; appliances when not in use.<\/span><\/li>\n<li style=\"font-weight: 400;\"><span style=\"font-weight: 400;\">Must keep a count of the number of devices that are in use in Hot and Cold Weather.<\/span><\/li>\n<\/ul>\n<p><span style=\"font-weight: 400;\">Thus, they are security devices that not only save electrical appliances or gadgets of your house but also the wiring and the entire house. So, whenever an MCB trips there is a serious reason behind it and should be dealt cautiously.<\/span><\/p>\n<p><span style=\"font-weight: 400;\">You can check our entire range of MCBs with their features <a href=\"https:\/\/cselectric.co.in\/products-solutions\/final-distribution-products\/miniature-circuit-breakers\/\">here<\/a><\/span><\/p>\n<p>&nbsp;<\/p>\n<p>&nbsp;<\/p>\n","protected":false},"excerpt":{"rendered":"<p>What is an MCB? MCBs or Miniature Circuit Breakers are protective electromagnetic devices that act as a switch in a circuit. They automatically open the circuit whenever they sense the current passing over the circuit has crossed a certain limit or value. The device can also be used as a normal on and off switch&hellip;<\/p>\n","protected":false},"author":1,"featured_media":905,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[251],"tags":[],"class_list":["post-894","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-knowledge"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v26.7 - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>Why Does Your MCB Trip? Common Causes &amp; Solutions | C&amp;S Electric<\/title>\n<meta name=\"description\" content=\"Understand why your MCB trips and how to fix it. Explore common causes like overloads, short circuits, and grounding issues. 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