Home / Electrical Articles / What is MCB (miniature circuit breaker) What is MCB (miniature circuit breaker) Author: Technical Editor Category: Electrical Articles 4 May 18 MCB is a mechanical device operate automatic operation designed to connect and disconnect the electrical circuit in the ordinary and extraordinary situation suitable both for A.C and D.C voltage. The main function of the MCB to protect equipment or circuits from overhead and short circuit. The size of MCB is small and usually, use for a household appliance and domestic. The average fix ampere rating from 6amp up to 125amp. It can be reset back to the normal condition after the trip but cannot adjust ampere rating. Miniature circuit breaker working An electric current requires two wires to complete the circuit. From source via the in wire to the load and from there via out wire back to the electrical source. The current in these two wire current is so longer identical. In the MCB both currents are run through 2 small coils mounted in such a way that magnetic filed produced are annihilating each other. A small mechanical switch near these coil trips however when the fields are no longer identical and therefore result in the electromagnetic field and tripping of the circuits occur. Like3 Dislike Related Articles:Construction of MCBEight major equipment in the substationEarth leakage circuit breaker (ELCB)Analog between hydraulic and electric circuitsWhat is fuse and its types?Sources for electronic circuits Related Posts Difference between Shunt Capacitor and Series Inductor Filter by Ravi Barwad Types of motor enclosure by Technical Editor Leave a Reply Cancel reply Your email address will not be published. Required fields are marked *Name:* Email:* Website : Save my name, email, and website in this browser for the next time I comment.