{"id":1208,"date":"2020-07-06T19:19:07","date_gmt":"2020-07-06T19:19:07","guid":{"rendered":"https:\/\/www.zillionsbuyer.com\/blog\/?p=1208"},"modified":"2020-07-06T19:19:15","modified_gmt":"2020-07-06T19:19:15","slug":"what-is-moulded-case-circuit-breaker-its-application","status":"publish","type":"post","link":"https:\/\/www.zillionsbuyer.com\/blog\/what-is-moulded-case-circuit-breaker-its-application\/","title":{"rendered":"What is Moulded case circuit breaker & its application."},"content":{"rendered":"\n

Moulded Case Circuit Breakers (MCCRs) :<\/strong><\/p>\n\n\n\n

The moulded case circuit breaker<\/a><\/strong> is a simple, compact, economical air break circuit breaker which can be conveniently mass produced because of its moulded construction (see IS: 13947-2), is cost lies somewhere between the cost of a switch fuse combination and conventional circuit breaker of an equally reputable.<\/p>\n\n\n\n

However, for more complete comparison, it\nis necessary to consider the wholesome cost in terms of the size, weight,\nmaintenance, assembly effort, speed of breaking, securing costs and other\nfactors, such as down times and accuracy of protection<\/p>\n\n\n\n

The moulded housing is made of heat\nresistant phenolasbestos or plastics which are easy to install. Only low\nvoltage types are available in ratings up to 660 volts ac and current rating up\nto 2500 A and breaking capacities up to 100 kA ms symmetrical at 0.20 power\nfactor<\/p>\n\n\n\n

Apart from their modest breaking capacity\nhaving the same advantages and disadvantages as large air break circuit\nbreakers, modern MCCBS afford reliable protection and are also available with a\ntrip-free mechanism.<\/p>\n\n\n\n

They are usually fitted with a built-in\ntripping system which can either be of a thermal-magnetic or fully magnetic type\nwith inverse time-current characteristics respectively, for overload protection\nand instantaneous protection against short circuits<\/p>\n\n\n\n

The typical inverse time-current\ncharacteristics for both the tripping \nreleases . These characteristics are specified for certain ambient\ntemperatures 20. 40\u00b0C and a suitable correction factor is specified for other\nambient temperature conditions.<\/p>\n\n\n\n

 The\ntripping mechanism characteristics can be designed for specific requirements of\nthe distribution circuit. Current transformers are not used with MCCB.<\/p>\n\n\n\n

\"\"<\/figure>\n\n\n\n

The thermal setting is usually adjustable\nbetween 50 and 130 percent of the rated current for overload protection as\ndefined by IS 382 and magnetic setting between 300 and 1200 per cent of the\nrated current for short circuit protection<\/p>\n\n\n\n

In case of ally magnetic tripping mechanism\nthem current characteristic overload setting is usually been the range of 75\nand 200 per cent and instantaneous setting bets and 1200 per cent Other\nprotection provisions, such as shunt or under voltage  release and one or two auxiliary switches are\navailable as options.<\/p>\n\n\n\n

The breaking capacity is a limitation only\nwhere the source impedance is very low and highly inductive. Since the minimum\nsource impedance can be readily calculated in the design of many installations\nfor a given location, the suitability of moulded case circuit breakers in such\na location can be readily assessed<\/p>\n\n\n\n

On the other hand, in improving the power\nsupply which has the effect of reducing the source impedance of a system\nalready fitted with moulded case circuit breakers, due notice should be taken\nof any limitations of the breaking capacity and provision made in the modified\ndesign.  Modern current limiting MCCB\nafford very low let-through energy and belter protection coordination.<\/p>\n\n\n\n

 Three\nimportant applications of MCCBs are main incoming circuit breaker for secondary\nside of transformers, distribution feeder protection and motor control. In\nrural areas where there is a problem of getting the right fuse to replace blown\nfuses, these breakers can be very useful of providing protection to the\ndistribution transformers.<\/p>\n","protected":false},"excerpt":{"rendered":"

Moulded Case Circuit Breakers (MCCRs) : The moulded case circuit breaker is a simple, compact, economical air break circuit breaker which can be conveniently mass produced because of its moulded construction (see IS: 13947-2), is cost lies somewhere between the cost of a switch fuse combination and conventional circuit breaker of an equally reputable. However, […]<\/p>\n","protected":false},"author":1,"featured_media":1209,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[44],"tags":[352],"class_list":["post-1208","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-electrical-engineering","tag-moulded-case-circuit-breaker"],"_links":{"self":[{"href":"https:\/\/www.zillionsbuyer.com\/blog\/wp-json\/wp\/v2\/posts\/1208","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.zillionsbuyer.com\/blog\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.zillionsbuyer.com\/blog\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.zillionsbuyer.com\/blog\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/www.zillionsbuyer.com\/blog\/wp-json\/wp\/v2\/comments?post=1208"}],"version-history":[{"count":1,"href":"https:\/\/www.zillionsbuyer.com\/blog\/wp-json\/wp\/v2\/posts\/1208\/revisions"}],"predecessor-version":[{"id":1210,"href":"https:\/\/www.zillionsbuyer.com\/blog\/wp-json\/wp\/v2\/posts\/1208\/revisions\/1210"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/www.zillionsbuyer.com\/blog\/wp-json\/wp\/v2\/media\/1209"}],"wp:attachment":[{"href":"https:\/\/www.zillionsbuyer.com\/blog\/wp-json\/wp\/v2\/media?parent=1208"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.zillionsbuyer.com\/blog\/wp-json\/wp\/v2\/categories?post=1208"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.zillionsbuyer.com\/blog\/wp-json\/wp\/v2\/tags?post=1208"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}