It works similarly to a miniature circuit breaker (MCB), through the induction of the circuit by the internal bimetal and the thermal magnetic coil, thereby triggering the tripping rod to trip the product, thereby protecting the circuit and the load equipment.
Parameter and application of molded case circuit breaker
It is different from the current range of the miniature circuit breaker (MCB). The maximum current of the general rail-type miniature circuit breaker can only be 125A, and the maximum current of the molded case circuit breaker (MCCB) is 1600A. High from 20kA to 65kA, commonly used in industrial power distribution, commercial power distribution, some large power sites and three-phase power equipment (commonly used number of poles are 2P, 3P, 4P), as the main power of the secondary distribution box switch is used.
Due to the popularity of solar power systems, from ordinary AC MCCB, we extend DC MCCB from DC 250V to 1500V.
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.