{"id":3597,"date":"2020-12-22T09:00:05","date_gmt":"2020-12-22T17:00:05","guid":{"rendered":"https:\/\/www.linquip.com\/blog\/?p=3597"},"modified":"2025-08-28T01:23:21","modified_gmt":"2025-08-28T09:23:21","slug":"difference-between-isolator-and-circuit-breaker","status":"publish","type":"post","link":"https:\/\/www.linquip.com\/blog\/difference-between-isolator-and-circuit-breaker\/","title":{"rendered":"Difference Between Isolator and Circuit Breaker: Ultimate Guide"},"content":{"rendered":"<div id=\"ez-toc-container\" class=\"ez-toc-v2_0_82_2 counter-hierarchy ez-toc-counter ez-toc-grey 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:\/\/www.linquip.com\/blog\/difference-between-isolator-and-circuit-breaker\/#What_is_an_Isolator\" >What is an Isolator?<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-2\" href=\"https:\/\/www.linquip.com\/blog\/difference-between-isolator-and-circuit-breaker\/#What_is_a_Circuit_Breaker\" >What is a Circuit Breaker?<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-3\" href=\"https:\/\/www.linquip.com\/blog\/difference-between-isolator-and-circuit-breaker\/#Isolator_vs_Circuit_breaker\" >Isolator vs. Circuit breaker<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-4\" href=\"https:\/\/www.linquip.com\/blog\/difference-between-isolator-and-circuit-breaker\/#Conclusion\" >Conclusion<\/a><\/li><\/ul><\/nav><\/div>\n<p><span style=\"font-weight: 400;\">A crucial component of a circuit is its switch. The switch acts as a gate that allows the movement of charges through the circuit. Isolators and circuit breakers are both switches commonly found in industrial installations to isolate a section of the power system. They are closely related to each other, having a similar principle like disconnection for separating the parts of the electrical circuit from the system. However, several differences can manage to draw a line between these two. We are going to discuss the <\/span><span style=\"font-weight: 400;\">difference between isolators and circuit breakers<\/span><span style=\"font-weight: 400;\"> in the upcoming paragraphs. Read this new Linquip blog to find out more about them.<\/span><\/p>\n<h2><span class=\"ez-toc-section\" id=\"What_is_an_Isolator\"><\/span><strong>What is an Isolator?<\/strong><span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p><span style=\"font-weight: 400;\">First, let us have a quick review of isolators and circuit breakers before we dive into the differences between these two.<\/span><\/p>\n<p><span style=\"font-weight: 400;\">An isolator is one type of switching device, and its fundamental function is to make sure that a circuit is totally not triggered in order to perform the preservation. It is also recognizable like isolation switches to isolate a fraction of the electrical circuit when it is required. It is generally used at the end of the breaker to repair or to replace. An isolator blocks the DC signals &amp; allows the AC signals to flow.<\/span><\/p>\n<p><img decoding=\"async\" class=\"size-full wp-image-3600 aligncenter\" src=\"https:\/\/www.linquip.com\/blog\/wp-content\/uploads\/2020\/12\/51iR5PxbiqL._SL1000_.jpg\" alt=\"difference between isolator and circuit breaker\" width=\"700\" height=\"700\" title=\"\" srcset=\"https:\/\/www.linquip.com\/blog\/wp-content\/uploads\/2020\/12\/51iR5PxbiqL._SL1000_.jpg 700w, https:\/\/www.linquip.com\/blog\/wp-content\/uploads\/2020\/12\/51iR5PxbiqL._SL1000_-300x300.jpg 300w, https:\/\/www.linquip.com\/blog\/wp-content\/uploads\/2020\/12\/51iR5PxbiqL._SL1000_-150x150.jpg 150w, https:\/\/www.linquip.com\/blog\/wp-content\/uploads\/2020\/12\/51iR5PxbiqL._SL1000_-696x696.jpg 696w, https:\/\/www.linquip.com\/blog\/wp-content\/uploads\/2020\/12\/51iR5PxbiqL._SL1000_-420x420.jpg 420w\" sizes=\"(max-width: 700px) 100vw, 700px\" \/><\/p>\n<p><span style=\"font-weight: 400;\">It is a separate part of the system that is created for safe maintenance. These switches are applicable to the industrial distribution of electrical power, etc. One thing is to make sure beforehand whenever we are using an isolator that the current flow through is zero or within limits of safety.<\/span><\/p>\n<h2><span class=\"ez-toc-section\" id=\"What_is_a_Circuit_Breaker\"><\/span><strong>What is a Circuit Breaker?<\/strong><span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p><span style=\"font-weight: 400;\">A circuit breaker is a protective apparatus that works like a switch. It is installed in a circuit in order to stop the flow of current whenever necessary. It can be operated for controlling and protecting the electrical system in which it is introduced. This device finds use to control the flow of current same as a fuse. It breaks the circuit in case of fault conditions like short circuits and overloads. A circuit breaker is suitable for handling heavy load currents and is attached to devices like transformers etc.<\/span><\/p>\n<h2><span class=\"ez-toc-section\" id=\"Isolator_vs_Circuit_breaker\"><\/span><strong>Isolator vs. Circuit breaker<\/strong><span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p><span style=\"font-weight: 400;\">There is a description of the <\/span><span style=\"font-weight: 400;\">difference between an isolator and a circuit breaker<\/span><span style=\"font-weight: 400;\"> by considering several factors. Various factors like those mentioned further are taken into account while selecting an isolator or a circuit breaker for a particular application.<\/span><\/p>\n<p><span style=\"font-weight: 400;\">The following factors show the main differences between isolators and circuit breakers.<\/span><\/p>\n<p>&nbsp;<\/p>\n<h3><strong>Construction<\/strong><\/h3>\n<ul>\n<li style=\"font-weight: 400;\"><span style=\"font-weight: 400;\">The isolator is a type of simple mechanical switch.<\/span><\/li>\n<li style=\"font-weight: 400;\"><span style=\"font-weight: 400;\">The circuit breaker consists of an electromechanical switch and a relay in a single box.<\/span><\/li>\n<\/ul>\n<h3><strong>Type of Device<\/strong><\/h3>\n<ul>\n<li style=\"font-weight: 400;\"><span style=\"font-weight: 400;\">The isolator is an off-loading device. It can only be operated when the power supply is off.<\/span><\/li>\n<li style=\"font-weight: 400;\"><span style=\"font-weight: 400;\">The circuit breaker is an on-load device. It operates when the power supply is on.<\/span><\/li>\n<\/ul>\n<h3><strong>Operation<\/strong><\/h3>\n<ul>\n<li style=\"font-weight: 400;\"><span style=\"font-weight: 400;\">The isolator is not designed for automatic switching and operates manually.\u00a0<\/span><\/li>\n<li style=\"font-weight: 400;\"><span style=\"font-weight: 400;\">The circuit breaker is operated both automatically and manually.<\/span><\/li>\n<\/ul>\n<h3><strong>Function<\/strong><\/h3>\n<ul>\n<li style=\"font-weight: 400;\"><span style=\"font-weight: 400;\">When a fault occurs in a substation, then the isolator cuts out a portion of a substation. The other apparatus works without any intrusion.<\/span><\/li>\n<li style=\"font-weight: 400;\"><span style=\"font-weight: 400;\">The circuit breaker is like an Automatic circuit breaker (ACB) or Miniature circuit breaker (MCB) that trips the entire system if there is an error occurs.<\/span><\/li>\n<\/ul>\n<h3><strong>Withstand Capacity<\/strong><\/h3>\n<ul>\n<li style=\"font-weight: 400;\"><span style=\"font-weight: 400;\">The isolator has a low withstand capacity when contrasted to the circuit breaker.<\/span><\/li>\n<li style=\"font-weight: 400;\"><span style=\"font-weight: 400;\">The circuit breaker has a high withstand capacity at the condition of on-load.<\/span><\/li>\n<\/ul>\n<p><img decoding=\"async\" class=\"size-full wp-image-3601 aligncenter\" src=\"https:\/\/www.linquip.com\/blog\/wp-content\/uploads\/2020\/12\/51g-rChiMdL._SL1001_.jpg\" alt=\"difference between isolator and circuit breaker\" width=\"700\" height=\"700\" title=\"\" srcset=\"https:\/\/www.linquip.com\/blog\/wp-content\/uploads\/2020\/12\/51g-rChiMdL._SL1001_.jpg 700w, https:\/\/www.linquip.com\/blog\/wp-content\/uploads\/2020\/12\/51g-rChiMdL._SL1001_-300x300.jpg 300w, https:\/\/www.linquip.com\/blog\/wp-content\/uploads\/2020\/12\/51g-rChiMdL._SL1001_-150x150.jpg 150w, https:\/\/www.linquip.com\/blog\/wp-content\/uploads\/2020\/12\/51g-rChiMdL._SL1001_-696x696.jpg 696w, https:\/\/www.linquip.com\/blog\/wp-content\/uploads\/2020\/12\/51g-rChiMdL._SL1001_-420x420.jpg 420w\" sizes=\"(max-width: 700px) 100vw, 700px\" \/><\/p>\n<h3><strong>Contacts<\/strong><\/h3>\n<ul>\n<li style=\"font-weight: 400;\"><span style=\"font-weight: 400;\">The isolator has main and moving arms\/blades.<\/span><\/li>\n<li style=\"font-weight: 400;\"><span style=\"font-weight: 400;\">The circuit breaker has main as well as arcing contacts.<\/span><\/li>\n<\/ul>\n<h3><strong>Trap Charges<\/strong><\/h3>\n<ul>\n<li style=\"font-weight: 400;\"><span style=\"font-weight: 400;\">The isolator can remove the trap charges.<\/span><\/li>\n<li style=\"font-weight: 400;\"><span style=\"font-weight: 400;\">The circuit breaker can\u2019t remove the trap charges.<\/span><\/li>\n<\/ul>\n<h3><strong>Insulation<\/strong><\/h3>\n<ul>\n<li style=\"font-weight: 400;\"><span style=\"font-weight: 400;\">Isolator does not require insulation or an insulation medium.<\/span><\/li>\n<li style=\"font-weight: 400;\"><span style=\"font-weight: 400;\">Circuit breaker, Air, Oil, Vacuum, or SF6 gas are used as an insulation medium.<\/span><\/li>\n<\/ul>\n<h3><strong>Interruption<\/strong><\/h3>\n<ul>\n<li style=\"font-weight: 400;\"><span style=\"font-weight: 400;\">The isolator does not interrupt any current. It only isolates the circuit for maintenance purposes.<\/span><\/li>\n<li style=\"font-weight: 400;\"><span style=\"font-weight: 400;\">The circuit breaker interrupts the normal as well as short circuit currents during faults.<\/span><\/li>\n<\/ul>\n<h3><strong>Current Flow Operation<\/strong><\/h3>\n<ul>\n<li style=\"font-weight: 400;\"><span style=\"font-weight: 400;\">The isolator should not be opened when the current is flowing through it. The current flow should be disconnected by turning off the circuit breaker before.<\/span><\/li>\n<li style=\"font-weight: 400;\"><span style=\"font-weight: 400;\">The circuit breaker can be opened during the flow of current through it. It can be operated in both cases where the power supply from the utility pole is on or off.<\/span><\/li>\n<\/ul>\n<h3><strong>Earth Switch<\/strong><\/h3>\n<ul>\n<li style=\"font-weight: 400;\"><span style=\"font-weight: 400;\">Single or double earth switches can be included in the isolator.<\/span><\/li>\n<li style=\"font-weight: 400;\"><span style=\"font-weight: 400;\">Earth switches are not included in the circuit breakers.<\/span><\/li>\n<\/ul>\n<h3><strong>Over-Voltage During Switching<\/strong><\/h3>\n<ul>\n<li style=\"font-weight: 400;\"><span style=\"font-weight: 400;\">In the isolator, there is no overvoltage rise during switching as it is an off-loading device.<\/span><\/li>\n<li style=\"font-weight: 400;\"><span style=\"font-weight: 400;\">In circuit breakers, there is a chance of a rise in overvoltage during switching operations.<\/span><\/li>\n<\/ul>\n<p><span style=\"font-weight: 400;\">Few other <\/span><span style=\"font-weight: 400;\">differences between isolators and circuit breakers<\/span><span style=\"font-weight: 400;\"> to keep in mind:<\/span><\/p>\n<ul>\n<li style=\"font-weight: 400;\"><span style=\"font-weight: 400;\">Isolators are used in industrial applications, while circuit breakers find their applications in industrial as well as domestic applications.<\/span><\/li>\n<li style=\"font-weight: 400;\"><span style=\"font-weight: 400;\">Isolators are never used to make or break load and fault currents, while the circuit breaker is designed to make or break load and fault currents.<\/span><\/li>\n<li style=\"font-weight: 400;\"><span style=\"font-weight: 400;\">The isolator is not built with arc quenching methods, while a circuit breaker is always provided with some arc quenching techniques.<\/span><\/li>\n<li style=\"font-weight: 400;\"><span style=\"font-weight: 400;\">Isolator operates after the circuit breaker all the time, but a circuit breaker should operate before the isolator.<\/span><\/li>\n<li style=\"font-weight: 400;\"><span style=\"font-weight: 400;\">The isolator is provided on both sides of the circuit breaker, while a <a href=\"https:\/\/en.wikipedia.org\/wiki\/Circuit_breaker\" target=\"_blank\" rel=\"noopener noreferrer\" data-schema-attribute=\"\">circuit breaker<\/a> is installed within the circuit.<\/span><\/li>\n<\/ul>\n<p><span style=\"font-weight: 400;\">With all of that said, it is quite clear that there are significant differences between isolator and circuit breaker, and many assume that one works better than the other. The truth is that they are both vital for any electrical setup.<\/span><\/p>\n<p>&nbsp;<\/p>\n<h2><span class=\"ez-toc-section\" id=\"Conclusion\"><\/span><strong>Conclusion<\/strong><span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p><span style=\"font-weight: 400;\">So, there you have a detailed description of the <\/span><span style=\"font-weight: 400;\">difference between an isolator and a circuit breaker<\/span><span style=\"font-weight: 400;\">. If you enjoyed this article in Linquip, let us know by leaving a reply in the comment section. Is there any question we can help you with? Feel free to <a href=\"https:\/\/www.linquip.com\/sign-up?client_redirect=\/\" target=\"_blank\" rel=\"noopener noreferrer\" data-schema-attribute=\"\">sign up<\/a> on our website to get the most professional advice from our experts.<\/span><\/p>\n<h3><b>Buy Equipment or Ask for a Service<\/b><\/h3>\n<p>By using Linquip RFQ Service, you can expect\u00a0to receive quotations from various suppliers across multiple industries and regions.<\/p>\n<p><strong><a href=\"http:\/\/linquip.com\/get-quote?utm_source=blog&amp;utm_medium=content&amp;utm_campaign=product_list&amp;utm_term=product_list&amp;utm_content=rfq\" target=\"_blank\" rel=\"noopener\">Click Here to Request a Quotation From Suppliers and Service Providers<\/a><\/strong><\/p>\n<p><em><strong>Read More on Linquip<\/strong><\/em><\/p>\n<ul>\n<li><span style=\"text-decoration: underline;\"><strong><span style=\"font-family: verdana, geneva, sans-serif; font-size: 10pt;\"><a href=\"https:\/\/www.linquip.com\/blog\/how-does-a-circuit-breaker-work\/\" target=\"_blank\" rel=\"noopener\">How does a Circuit Breaker Work?<\/a><\/span><\/strong><\/span><\/li>\n<li><span style=\"text-decoration: underline;\"><strong><span style=\"font-family: verdana, geneva, sans-serif; font-size: 10pt;\"><a href=\"https:\/\/www.linquip.com\/blog\/difference-between-relay-circuit-breaker\/\" target=\"_blank\" rel=\"noopener\">Difference Between Relay and Circuit Breaker: Everything You Need to Know<\/a><\/span><\/strong><\/span><\/li>\n<li><span style=\"text-decoration: underline;\"><strong><span style=\"font-family: verdana, geneva, sans-serif; font-size: 10pt;\"><a href=\"https:\/\/www.linquip.com\/blog\/series-vs-parallel-circuits\/\" target=\"_blank\" rel=\"noopener\">Difference between Series and Parallel Circuits | What are they Completely?<\/a><\/span><\/strong><\/span><\/li>\n<li><span style=\"text-decoration: underline;\"><strong><span style=\"font-family: verdana, geneva, sans-serif; font-size: 10pt;\" data-sheets-value=\"{&quot;1&quot;:2,&quot;2&quot;:&quot;The 8 Best Circuit Breaker Locators in 2022&quot;}\" data-sheets-userformat=\"{&quot;2&quot;:1073857,&quot;3&quot;:{&quot;1&quot;:0},&quot;9&quot;:1,&quot;10&quot;:1,&quot;12&quot;:0,&quot;16&quot;:11,&quot;17&quot;:1,&quot;23&quot;:1}\" data-sheets-hyperlink=\"https:\/\/www.linquip.com\/blog\/the-best-circuit-breaker-locators-in-2022\/\"><a class=\"in-cell-link\" href=\"https:\/\/www.linquip.com\/blog\/the-best-circuit-breaker-locators-in-2022\/\" target=\"_blank\" rel=\"noopener\">The 8 Best Circuit Breaker Locators in 2025<\/a><\/span><\/strong><\/span><\/li>\n<\/ul>\n","protected":false},"excerpt":{"rendered":"<p>A crucial component of a circuit is its switch. The switch acts as a gate that allows the movement of charges through the circuit. Isolators and circuit breakers are both switches commonly found in industrial installations to isolate a section of the power system. They are closely related to each other, having a similar principle &#8230;<\/p>\n","protected":false},"author":6,"featured_media":3599,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"site-sidebar-layout":"default","site-content-layout":"default","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":"","theme-transparent-header-meta":"default","adv-header-id-meta":"","stick-header-meta":"","header-above-stick-meta":"","header-main-stick-meta":"","header-below-stick-meta":"","footnotes":""},"categories":[21],"tags":[],"class_list":["post-3597","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-electrical-component"],"acf":[],"_links":{"self":[{"href":"https:\/\/www.linquip.com\/blog\/wp-json\/wp\/v2\/posts\/3597","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.linquip.com\/blog\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.linquip.com\/blog\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.linquip.com\/blog\/wp-json\/wp\/v2\/users\/6"}],"replies":[{"embeddable":true,"href":"https:\/\/www.linquip.com\/blog\/wp-json\/wp\/v2\/comments?post=3597"}],"version-history":[{"count":4,"href":"https:\/\/www.linquip.com\/blog\/wp-json\/wp\/v2\/posts\/3597\/revisions"}],"predecessor-version":[{"id":36555,"href":"https:\/\/www.linquip.com\/blog\/wp-json\/wp\/v2\/posts\/3597\/revisions\/36555"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/www.linquip.com\/blog\/wp-json\/wp\/v2\/media\/3599"}],"wp:attachment":[{"href":"https:\/\/www.linquip.com\/blog\/wp-json\/wp\/v2\/media?parent=3597"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.linquip.com\/blog\/wp-json\/wp\/v2\/categories?post=3597"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.linquip.com\/blog\/wp-json\/wp\/v2\/tags?post=3597"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}