{"id":810,"date":"2019-08-08T12:23:00","date_gmt":"2019-08-08T12:23:00","guid":{"rendered":"http:\/\/www.cselectric.co.in\/blog\/?p=810"},"modified":"2025-12-24T11:01:20","modified_gmt":"2025-12-24T11:01:20","slug":"difference-fuse-circuit-breaker","status":"publish","type":"post","link":"https:\/\/cselectric.co.in\/blog\/difference-fuse-circuit-breaker\/","title":{"rendered":"Difference Between Fuse &#038; Circuit Breaker"},"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\/difference-fuse-circuit-breaker\/#What_is_Fuse\" >What is Fuse?<\/a><ul class='ez-toc-list-level-3' ><li class='ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-2\" href=\"https:\/\/cselectric.co.in\/blog\/difference-fuse-circuit-breaker\/#As_per_IEC_60269_the_fuse_can_be_identified_as_mentioned_below\" >As per IEC 60269, the fuse can be identified as mentioned below:<\/a><\/li><\/ul><\/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\/difference-fuse-circuit-breaker\/#What_is_Circuit_Breaker\" >What is 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:\/\/cselectric.co.in\/blog\/difference-fuse-circuit-breaker\/#According_to_the_medium_of_arc_quenching_circuit_breaker_can_be_differentiated_as_below\" >According to the medium of arc quenching circuit breaker can be differentiated as below<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-5\" href=\"https:\/\/cselectric.co.in\/blog\/difference-fuse-circuit-breaker\/#As_per_the_method_of_tripping_the_circuit_breaker_can_be_below_types\" >As per the method of tripping, the circuit breaker can be below types<\/a><\/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\/difference-fuse-circuit-breaker\/#Key_differences_between_Fuse_Circuit_Breaker\" >Key differences between Fuse &amp; Circuit Breaker<\/a><\/li><\/ul><\/nav><\/div>\n<div class=\"wpb-content-wrapper\"><p>[vc_row][vc_column][vc_column_text css=&#8221;&#8221;]<span style=\"font-weight: 400;\">In an electrical system \u2018Fault\u2019 is the condition which arise due to the malfunctioning of some component or wrong electrical practice. The fault may lead to a very dangerous situations such as explosion &amp; fire if not cleared timely, not only this the amount of time for which fault persists in the system it continuously deteriorates the system health causing high energy losses resulting in increased thermal stress upon the system.<\/span> <span style=\"font-weight: 400;\">From the above paragraph, it is clear that the faults are hazardous to the system &amp; requires to be cleared at the soonest thus, there is a need of such device which not only is capable of clearing the fault but also have a lower opening time in order to save the let-through energy &amp; minimize the thermal stress.<\/span> <span style=\"font-weight: 400;\">Fuse &amp; Circuit Breaker are the devices that fulfill the above criteria of the protection device i.e. capability of clearing the fault &amp; also have a lower opening time hence saves the let through energy as well.<\/span><br \/>\n<span id=\"what-is-fuse\" style=\"margin-top: -60px; padding-bottom: 60px; display: block;\"><\/span><\/p>\n<h2><span class=\"ez-toc-section\" id=\"What_is_Fuse\"><\/span><strong>What is Fuse?<\/strong><span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p><span style=\"font-weight: 400;\">Complying with IEC 60269, fuse is a device that blows in case of a fault &amp; can offer protection up to 80KA even beyond that. Whenever there is a fault in the system the fuse blows off &amp; protects the system by cutting off the supply. A <a href=\"https:\/\/cselectric.co.in\/products-solutions\/low-voltage-switchgear\/fuses-fuse-base\/\">fuse<\/a> is generally made of a ceramic body, having an element, The body is filled with quartz sand as shown in the fig:<\/span> <a href=\"https:\/\/cselectric.co.in\/blog\/wp-content\/uploads\/2019\/08\/HIGH-RUPTURING-CAPACITY.png\" rel=\"mfp\"><img loading=\"lazy\" decoding=\"async\" class=\"aligncenter wp-image-815 size-full lazyload\" src=\"data:image\/gif;base64,R0lGODlhAQABAAAAACH5BAEKAAEALAAAAAABAAEAAAICTAEAOw==\" data-src=\"https:\/\/cselectric.co.in\/blog\/wp-content\/uploads\/2019\/08\/HIGH-RUPTURING-CAPACITY.png\" alt=\"\" width=\"450\" height=\"489\" \/><\/a><\/p>\n<p style=\"text-align: center;\"><span style=\"font-weight: 400;\"><strong>HIGH RUPTURING CAPACITY (HRC) FUSE<\/strong><\/span><\/p>\n<p><span style=\"font-weight: 400;\">Whenever there is an overload in the system, the solder as shown, gets into a chemical reaction resulting in cutting off the supply. In case of short circuit the element gets torn due to the application of high electrodynamic force on the same because of high current such as short circuit. The blown fuse can be easily identified by the pop up indicator which pops up whenever the fuse interrupts. The function of quartz sand is to successfully quench the arc &amp; absorb the pressure thus, not letting the fuse to explode.<\/span> <span style=\"font-weight: 400;\">The fuse is the staunchest combatant of the system as it is the quickest interrupting device available in the entire electrical system. The fuse blown within 2-5ms hence saving the maximum amount of let-through energy.<\/span><br \/>\n<span id=\"as-per-iec-60269-the-fuse-can-be-identified-as-mentioned-below\" style=\"margin-top: -60px; padding-bottom: 60px; display: block;\"><\/span><\/p>\n<h3><span class=\"ez-toc-section\" id=\"As_per_IEC_60269_the_fuse_can_be_identified_as_mentioned_below\"><\/span><strong>As per IEC 60269, the fuse can be identified as mentioned below:<\/strong><span class=\"ez-toc-section-end\"><\/span><\/h3>\n<ul>\n<li style=\"font-weight: 400;\"><span style=\"font-weight: 400;\">The first letter is\u00a0\u2018a\u2019\u00a0if the fuse is for short-circuit protection only; an\u00a0associated\u00a0device must provide overload protection.<\/span><\/li>\n<li style=\"font-weight: 400;\"><span style=\"font-weight: 400;\">The first letter is\u00a0\u2018g\u2019\u00a0if the fuse is intended to operate even with currents as low as those that cause it to blow in one hour, ex. Overload. These are considered\u00a0general-purpose\u00a0fuses for the protection of wires.<\/span><\/li>\n<li style=\"font-weight: 400;\"><span style=\"font-weight: 400;\">The second letter indicates the type of equipment or system to be protected:<\/span><\/li>\n<\/ul>\n<ul>\n<li style=\"font-weight: 400;\"><span style=\"font-weight: 400;\">G \u2013 General purpose protection of wires and cables<\/span><\/li>\n<li style=\"font-weight: 400;\"><span style=\"font-weight: 400;\">M \u2013 Motors<\/span><\/li>\n<li style=\"font-weight: 400;\"><span style=\"font-weight: 400;\">PV \u2013 Solar\u00a0<\/span><a href=\"https:\/\/en.wikipedia.org\/wiki\/Photovoltaic\"><span style=\"font-weight: 400;\">photovoltaic<\/span><\/a><span style=\"font-weight: 400;\">\u00a0arrays as per 60269-6<\/span><\/li>\n<li style=\"font-weight: 400;\"><span style=\"font-weight: 400;\">R, S \u2013 Rectifiers or semiconductors as per 60269-5<\/span><\/li>\n<li style=\"font-weight: 400;\"><span style=\"font-weight: 400;\">Tr \u2013 Transformers<\/span><\/li>\n<\/ul>\n<p><span style=\"font-weight: 400;\">Fuse although, is the most dependable &amp; trusted protection device but can be used only one time, in no case the fuse can be repaired, after it blows off it only needs to be replaced.<\/span><\/p>\n<p>&nbsp;<\/p>\n<h2><span class=\"ez-toc-section\" id=\"What_is_Circuit_Breaker\"><\/span><strong>What is Circuit Breaker?<\/strong><span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p><span style=\"font-weight: 400;\">A <a href=\"https:\/\/cselectric.co.in\/blog\/circuit-breakers-discrimination-and-its-techniques\/\">circuit breaker<\/a> is a switching device which also offer protection against short circuit. Unlike fuse the circuit breaker do not blows off, but trips whenever there is a fault.<\/span> <span style=\"font-weight: 400;\">The circuit breaker complies with IEC 60947-2 &amp; can offer protection up to 150KA even beyond that, also a circuit breaker can offer a no of protections such as against:<\/span><\/p>\n<ul>\n<li style=\"font-weight: 400;\"><span style=\"font-weight: 400;\">Overload<\/span><\/li>\n<li style=\"font-weight: 400;\"><span style=\"font-weight: 400;\">Short Circuit<\/span><\/li>\n<li style=\"font-weight: 400;\"><span style=\"font-weight: 400;\">Under Voltage<\/span><\/li>\n<li style=\"font-weight: 400;\"><span style=\"font-weight: 400;\">Neutral<\/span><\/li>\n<li style=\"font-weight: 400;\"><span style=\"font-weight: 400;\">Earth Fault<\/span><\/li>\n<\/ul>\n<p><strong>A typical labelled diagram for the circuit breaker is as shown below:<\/strong><\/p>\n<p style=\"text-align: center;\"><a href=\"https:\/\/cselectric.co.in\/blog\/wp-content\/uploads\/2019\/08\/MOULDED-CASE-CIRCUIT-BREAKER.png\" rel=\"mfp\"><img loading=\"lazy\" decoding=\"async\" class=\"aligncenter wp-image-816 size-full lazyload\" src=\"data:image\/gif;base64,R0lGODlhAQABAAAAACH5BAEKAAEALAAAAAABAAEAAAICTAEAOw==\" data-src=\"https:\/\/cselectric.co.in\/blog\/wp-content\/uploads\/2019\/08\/MOULDED-CASE-CIRCUIT-BREAKER.png\" alt=\"\" width=\"512\" height=\"271\" \/><\/a><\/p>\n<p style=\"text-align: center;\"><strong>MOULDED CASE CIRCUIT BREAKER<\/strong><\/p>\n<p><span style=\"font-weight: 400;\">A circuit breaker is not required to be replaced after tripping once, instead it must complete its total no of operations as declared by the manufacturer. The tripping time for the circuit breaker may vary w.r.t its type, for ex. the trip time for <a href=\"https:\/\/cselectric.co.in\/products-solutions\/low-voltage-switchgear\/circuit-breakers\/moulded-case-circuit-breakers\/\">MCCB<\/a> is less than 10ms &amp; the opening time for ACB shall be less than 30ms. Not only this, MCCB also has a dedicated position for tripping, whenever the <a href=\"https:\/\/cselectric.co.in\/blog\/why-does-your-mcb-trip\/\">MCCB trips<\/a>, its actuator lever comes in between i.e. neither in \u2018ON\u2019 nor in \u2018OFF\u2019 position.<\/span><\/p>\n<h2><span class=\"ez-toc-section\" id=\"According_to_the_medium_of_arc_quenching_circuit_breaker_can_be_differentiated_as_below\"><\/span><strong>According to the medium of arc quenching circuit breaker can be differentiated as below<\/strong><span class=\"ez-toc-section-end\"><\/span><\/h2>\n<table>\n<tbody>\n<tr>\n<td><strong>SNO<\/strong><\/td>\n<td><strong>MEDIUM OF ARC QUENCHING<\/strong><\/td>\n<td><strong>CIRCUIT BREAKER<\/strong><\/td>\n<\/tr>\n<tr>\n<td><strong>1<\/strong><\/td>\n<td><span style=\"font-weight: 400;\">AIR<\/span><\/td>\n<td><span style=\"font-weight: 400;\">ACB, MCCB<\/span><\/td>\n<\/tr>\n<tr>\n<td><strong>2<\/strong><\/td>\n<td><span style=\"font-weight: 400;\">VACUUM<\/span><\/td>\n<td><span style=\"font-weight: 400;\">Vacuum Circuit Breaker<\/span><\/td>\n<\/tr>\n<tr>\n<td><strong>3<\/strong><\/td>\n<td><span style=\"font-weight: 400;\">GAS<\/span><\/td>\n<td><span style=\"font-weight: 400;\">SF6 Circuit Breaker<\/span><\/td>\n<\/tr>\n<tr>\n<td><strong>4<\/strong><\/td>\n<td><span style=\"font-weight: 400;\">OIL<\/span><\/td>\n<td><span style=\"font-weight: 400;\">Oil Circuit Breaker<\/span><\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<p><span style=\"font-weight: 400;\">For tripping the circuit, a circuit breaker requires a release which senses the fault &amp; gives a tripping command to the circuit breaker.<\/span><\/p>\n<h2><span class=\"ez-toc-section\" id=\"As_per_the_method_of_tripping_the_circuit_breaker_can_be_below_types\"><\/span><strong>As per the method of tripping, the circuit breaker can be below types<\/strong><span class=\"ez-toc-section-end\"><\/span><\/h2>\n<table>\n<tbody>\n<tr>\n<td><strong>SNO<\/strong><\/td>\n<td><strong>METHOD OF TRIPPING<\/strong><\/td>\n<td><strong>CIRCUIT BREAKER<\/strong><\/td>\n<\/tr>\n<tr>\n<td><strong>1<\/strong><\/td>\n<td><span style=\"font-weight: 400;\">BIMETAL (for Overload) &amp; Armature (for Short Circuit)<\/span><\/td>\n<td><span style=\"font-weight: 400;\">Thermal Magnetic Type<\/span><\/td>\n<\/tr>\n<tr>\n<td><strong>2<\/strong><\/td>\n<td><span style=\"font-weight: 400;\">ELECTRONIC<\/span><\/td>\n<td><span style=\"font-weight: 400;\">Microprocessor Type<\/span><\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<p><span style=\"font-weight: 400;\">Today the <a href=\"https:\/\/cselectric.co.in\/blog\/everything-need-know-circuit-breakers-introduction-applications-types\/\">circuit breaker<\/a> not only offers protection, but also has other features such as Annunciation, Current, Voltage &amp; Power Metering, Communication capability, Energy Measurement etc. which differentiate it from the fuse, also the use of circuit breaker leads to lower maintenance time, lower inventory &amp; finally cost saving.<\/span> <span style=\"font-weight: 400;\">Despite the above advantages of the circuit breaker over fuse, the fuse still has a higher hand on the circuit breaker &amp; that is because of its tripping time which is minimum, which is why in few applications fuse is used even at the upstream of circuit breakers.<\/span><\/p>\n<p>&nbsp;<\/p>\n<h2><span class=\"ez-toc-section\" id=\"Key_differences_between_Fuse_Circuit_Breaker\"><\/span><strong>Key differences between Fuse &amp; Circuit Breaker<\/strong><span class=\"ez-toc-section-end\"><\/span><\/h2>\n<table>\n<tbody>\n<tr>\n<td><strong>SNO<\/strong><\/td>\n<td><strong>PARAMETERS<\/strong><\/td>\n<td><strong>FUSE<\/strong><\/td>\n<td><strong>CIRCUIT BREAKER<\/strong><\/td>\n<\/tr>\n<tr>\n<td><strong>1<\/strong><\/td>\n<td><strong>MAINTENANCE<\/strong><\/td>\n<td><span style=\"font-weight: 400;\">Fuse can only be used 1 time, it is a non- reusable device<\/span><\/td>\n<td><span style=\"font-weight: 400;\">Circuit Breaker can offer total no of operations as declared by manufacturer.<\/span><\/td>\n<\/tr>\n<tr>\n<td><strong>2<\/strong><\/td>\n<td><strong>TRIP TIME<\/strong><\/td>\n<td><span style=\"font-weight: 400;\">2-5ms, quickest operating device<\/span><\/td>\n<td><span style=\"font-weight: 400;\">Vary as per the device, ex: for ACB it can be 30ms &amp; for MCCB can be less than 10ms<\/span><\/td>\n<\/tr>\n<tr>\n<td><strong>3<\/strong><\/td>\n<td><strong>UTILIZATION CATEGORY<\/strong><\/td>\n<td><span style=\"font-weight: 400;\">If first letter is \u2018g\u2019 means both protection (O\/L + S\/C), If first letter is \u2018a\u2019 only S\/C will be there.<\/span><\/td>\n<td><span style=\"font-weight: 400;\">If category A it means no Icw shall be there, If category B, Icw shall be there<\/span><\/td>\n<\/tr>\n<tr>\n<td><strong>4<\/strong><\/td>\n<td><strong>METHOD OF TRIPPING<\/strong><\/td>\n<td><span style=\"font-weight: 400;\">\u2018SOLDER\u2019 for Overload, \u2018ELEMENT\u2019 for Short Circuit<\/span><\/td>\n<td><span style=\"font-weight: 400;\">Available as \u2018MICRPROCEESOR\u2019 type &amp; \u2018THERMAL MAGNETIC\u2019 type<\/span><\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<p><span style=\"font-weight: 400;\">Know more about the wide range of C&amp;S Electric <\/span><a href=\"https:\/\/cselectric.co.in\/products-solutions\/low-voltage-switchgear\/\"><span style=\"font-weight: 400;\">Low Voltage Switchgear<\/span><\/a><span style=\"font-weight: 400;\"> products here.<\/span>[\/vc_column_text][\/vc_column][\/vc_row][vc_row][vc_column][\/vc_column][\/vc_row]<\/p>\n<\/div>","protected":false},"excerpt":{"rendered":"<p>[vc_row][vc_column][vc_column_text css=&#8221;&#8221;]In an electrical system \u2018Fault\u2019 is the condition which arise due to the malfunctioning of some component or wrong electrical practice. The fault may lead to a very dangerous situations such as explosion &amp; fire if not cleared timely, not only this the amount of time for which fault persists in the system it&hellip;<\/p>\n","protected":false},"author":1,"featured_media":826,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[251],"tags":[],"class_list":["post-810","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>Circuit Breaker vs Fuse: Know the Difference - C&amp;S Blog<\/title>\n<meta name=\"description\" content=\"Here&#039;s a detailed guide on key differences between fuse and circuit breakers. 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