Molded case circuit breaker (MCCB) for short, has the functions of short circuit protection, overload protection, and switching circuit, generally, with leakage protection, we call it a molded case leakage circuit breaker.

It is mainly used for terminal power distribution and can carry load directly. The maximum rated current shall not exceed 1600A. Its function is relatively simple, with thermal-magnetic, electromagnetic tripping, Undervoltage tripping, fault tripping, alarm and other functions, with several groups of auxiliary contacts.