{"id":4428,"date":"2025-03-05T12:09:08","date_gmt":"2025-03-05T06:39:08","guid":{"rendered":"https:\/\/study.madeeasy.in\/?p=4428"},"modified":"2025-09-08T15:41:27","modified_gmt":"2025-09-08T10:11:27","slug":"components-of-switchgear","status":"publish","type":"post","link":"https:\/\/www.madeeasy.in\/study\/ee\/power-generation-concepts\/components-of-switchgear","title":{"rendered":"COMPONENTS OF SWITCHGEAR"},"content":{"rendered":"<h2 style=\"text-align: justify;\">Switchgear has got mainly four components which are as follows:<\/h2>\n<ul style=\"text-align: justify;\">\n<li>Fuse<\/li>\n<li>Lightning arresters<\/li>\n<li>Circuit breakers<\/li>\n<li>Relays<\/li>\n<\/ul>\n<p style=\"text-align: justify;\">The various components along with some other equipments used have been described as follows :<\/p>\n<div id=\"ez-toc-container\" class=\"ez-toc-v2_0_79_1 ez-toc-wrap-left counter-hierarchy ez-toc-counter ez-toc-light-blue 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-3'><a class=\"ez-toc-link ez-toc-heading-1\" href=\"https:\/\/www.madeeasy.in\/study\/ee\/power-generation-concepts\/components-of-switchgear\/#Fuse\" >Fuse<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-2\" href=\"https:\/\/www.madeeasy.in\/study\/ee\/power-generation-concepts\/components-of-switchgear\/#Isolators\" >Isolators<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-3\" href=\"https:\/\/www.madeeasy.in\/study\/ee\/power-generation-concepts\/components-of-switchgear\/#Lightning-Arrester-or-Surge-Diverter\" >Lightning Arrester or Surge Diverter<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-4\" href=\"https:\/\/www.madeeasy.in\/study\/ee\/power-generation-concepts\/components-of-switchgear\/#Surge-Absorber\" >Surge Absorber<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-5\" href=\"https:\/\/www.madeeasy.in\/study\/ee\/power-generation-concepts\/components-of-switchgear\/#Circuit-Breaker-CB\" >Circuit Breaker (CB)<\/a><\/li><\/ul><\/nav><\/div>\n<h3 style=\"text-align: justify;\"><span class=\"ez-toc-section\" id=\"Fuse\"><\/span>Fuse<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p style=\"text-align: justify;\">Fuse is a piece of metal which interrupts the short circuit current. It is the cheapest and simplest current interrupting device for protection of the equipment upto 600 V against overloads and\/or short circuits. The fuse is expected to allow the flow of normal working current safely without overheating and during short circuit\/overloads it gets heated upto the melting point rapidly. The materials used normally are tin, silver, zinc, lead, copper, <a href=\"https:\/\/study.madeeasy.in\/me\/engineering-materials\/effect-of-alloying-elements-on-steel\/\" target=\"_blank\" rel=\"noopener\">aluminium<\/a> etc. The breaking capacity of the fuse is the maximum current that can safely be interrupted by the fuse. This should be higher than the prospective short-circuit current.<\/p>\n<h3 style=\"text-align: justify;\"><span class=\"ez-toc-section\" id=\"Isolators\"><\/span>Isolators<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p style=\"text-align: justify;\">Isolators are known as disconnecting switches, which operates under no-load conditions. They are not manufactured for any making or breaking current capacity. They do not have an arc quenching system within it. Isolators main functions is to disconnect a particular part after the current interruption from that particular part. These switches are generally used for the repair or replacement of a circuit breaker. It acts as a switch that disconnects the required part from the circuit where the repair has to be done.<\/p>\n<h3 style=\"text-align: justify;\"><span class=\"ez-toc-section\" id=\"Lightning-Arrester-or-Surge-Diverter\"><\/span>Lightning Arrester or Surge Diverter<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p style=\"text-align: justify;\">The device\/equipment used for the protection of the power system against voltage surge is called \u201csurge diverter\u201d or \u201clightning arrester\u201d. It is connected between the line and earth to divert the incoming high voltage wave to earth. A lightning arrester consists of non-linear resistor blocks connected in series with the series gap as shown below in figure. When a high voltage wave reaches the surge diverter, it sparks-over and provides a conducting path of relatively low impedance between the line and earth so that the resulting current flows to the earth. As soon as the voltage again comes to normal value, it stops the flow of current.<\/p>\n<p style=\"text-align: justify;\"><img loading=\"lazy\" decoding=\"async\" class=\"aligncenter wp-image-4429 size-full\" src=\"https:\/\/study.madeeasy.in\/wp-content\/uploads\/2025\/03\/lightning-arrester.jpg\" alt=\"Lightning Arrester\" width=\"492\" height=\"277\" srcset=\"https:\/\/www.madeeasy.in\/study\/wp-content\/uploads\/2025\/03\/lightning-arrester.jpg 492w, https:\/\/www.madeeasy.in\/study\/wp-content\/uploads\/2025\/03\/lightning-arrester-300x169.jpg 300w\" sizes=\"auto, (max-width: 492px) 100vw, 492px\" \/><\/p>\n<p style=\"text-align: justify;\">\u201cThyrite arresters\u201d are the most common and is mostly used for the protection against high and dangerous voltages.<\/p>\n<h3 style=\"text-align: justify;\"><span class=\"ez-toc-section\" id=\"Surge-Absorber\"><\/span>Surge Absorber<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p style=\"text-align: justify;\">The device which reduces the steepness of the wave front of a particular surge and thus minimises the danger due to over <a href=\"https:\/\/study.madeeasy.in\/ec\/analog-circuits\/voltage-follower\/\" target=\"_blank\" rel=\"noopener\">voltage<\/a> is known as \u201csurge modifier\u201d or \u201csurge absorber\u201d<\/p>\n<h3 style=\"text-align: justify;\"><span class=\"ez-toc-section\" id=\"Circuit-Breaker-CB\"><\/span>Circuit Breaker (CB)<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p style=\"text-align: justify;\">Circuit breakers are mechanical (or automatic now a days) devices designed to close or open contact members, thus closing or opening an electrical circuit under normal or abnormal conditions. Automatic circuit breakers for the protection of electrical circuits are equipped with a trip coil connected to a relay or other means which are used to open the breaker automatically under abnormal conditions (i.e. over current etc.).<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Switchgear has got mainly four components which are as follows: Fuse Lightning arresters Circuit breakers Relays The various components along<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[1221,5],"tags":[1274,1276,1275],"class_list":["post-4428","post","type-post","status-publish","format-standard","hentry","category-power-generation-concepts","category-ee","tag-lightning-arrester","tag-surge-absorber","tag-thyrite-arresters"],"_links":{"self":[{"href":"https:\/\/www.madeeasy.in\/study\/wp-json\/wp\/v2\/posts\/4428","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.madeeasy.in\/study\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.madeeasy.in\/study\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.madeeasy.in\/study\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/www.madeeasy.in\/study\/wp-json\/wp\/v2\/comments?post=4428"}],"version-history":[{"count":0,"href":"https:\/\/www.madeeasy.in\/study\/wp-json\/wp\/v2\/posts\/4428\/revisions"}],"wp:attachment":[{"href":"https:\/\/www.madeeasy.in\/study\/wp-json\/wp\/v2\/media?parent=4428"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.madeeasy.in\/study\/wp-json\/wp\/v2\/categories?post=4428"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.madeeasy.in\/study\/wp-json\/wp\/v2\/tags?post=4428"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}