Posts Tagged ‘miniature circuit’

Selection of Miniature Circuit Breaker

April 15th, 2014 | 12 Comments | Posted in Electrical distribution
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Thanks to Manish, another member of the electrical engineering community, for sending us this article about MCBs. Remember you can also send us articles about the topic you want by a mail

MCB stands for Miniature Circuit Breaker. It is a vital circuit breaking component found in today’s modern electrical distribution system. It replaces earlier method of circuit breaking done via melting fuse wire.

A melting fuse wire system is replaceable type of circuit breaking in which the fuse wire melts and permanently breaks the circuit upon an overload current event. Due to this hence it is quite cumbersome to each time replace and fix a new fuse wire.

A miniature circuit breaker on other hand is reusable type of circuit breaking device that is nowadays widely used in homes and offices.

Working Principle

While the main purpose of this article is about selection of MCBs, it is worth summarizing the working principle of MCBs in brief.

MCB is a compact cased device that has an electro-mechanical mechanism inside that provides overload protection.

There are essentially three different mechanisms inside that provide overload protection:


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