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Moulded Case Circuit Breaker (MCCB) Definition and Function

Moulded case circuit breaker, abbreviated MCCB, is a type of electrical protection device that can be used for a wide range of voltages, and frequencies of both 50 Hz and 60 Hz. The main distinctions between moulded case circuit breaker (MCCB) and miniature circuit breaker (MCB) are that the MCCB can carry current ratings up to 2,500 amperes, and its trip settings are normally adjustable. An additional difference is that MCCB tends to be much larger than MCB.

Related to most types of circuit breakers, MCCB has three main functions:

a) Protection against overload. Here overload means the currents above the rated value for the application.

b) Protection against electrical faults. During a fault such as a short circuit or line fault, there are extremely high currents that must be interrupted immediately.

c) Switching a circuit on and off. It can be used for the purpose if there isn’t an adequate manual switch.

The wide range of current ratings available from moulded case circuit breakers (MCCB) allows them to be used in a wide variety of applications. MCCB is available with current ratings that range from low values such as 15 amperes, to industrial ratings such as 2,500 amperes. This allows them to be used in both low-power and high-power applications.

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