What is the difference between MCB and MCCB? - ProProfs Discuss
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What is the difference between MCB and MCCB?

Asked by B. Wright, Last updated: Sep 15, 2020

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1 Answer

Howard Reyes

Howard Reyes

Howard Reyes
Howard Reyes, Science Teacher, California

Answered Jul 17, 2019

MCB and MCCB are the short forms of Miniature Circuit Breaker and Molded Case Circuit Breaker. As contained in their names, they are both circuit breaker, meaning, they are electrical switches capable of opening and closing an electrical circuit in all operating conditions, including fault situations.

MCB and MCCB are the short forms of Miniature Circuit Breaker and Molded Case Circuit Breaker. As
The first difference between the two circuit breakers is their capacity. MCB (Miniature Circuit Breaker) comes with the capacity of 100amps, while MCCB comes with the capacity of 2500amps. Due to the lower capacity of MCB, it is used for connection with low-energy. It is used for home wiring and other smaller electronic works. MCCB, on the other hand, is used for the electrical connection of high power equipment. The interrupting rating of MCB is quite different from the interrupting rating of MCCB. MCB comes with the interrupting rating of 18,000, while MCCB comes with the interrupting rating of 200,000. Finally, the position of both MCB and MCCB must be known for safety reasons.

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