Circuit Breaker Types in Low Voltage Systems

We have three different types of circuit breakers as follows:

1- Miniature Circuit Breaker or MCB:
Usually, we find it in the final electrical distribution boards; it can be one pole, two poles, three poles, or four poles.

Also, we can use it as a protection circuit breaker in the control panels.


2- Molded Case Circuit Breakers or MCB:
Usually, it will be as the main breaker in the sub-main panels or the breaker of the branch circuits in the main panels.
It has a higher short circuit capacity than MCB.


3- Air Circuit Breaker or ACB:
Usually, it will be the main breaker in the main panels or MDB.
It has higher short-circuit capacity than MCB & MCCB


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Shunt Trip Coil

A shunt trip coil is an optional accessory in a circuit breaker that mechanically trips the breaker when power is applied to the shunt trip terminals.

The power for the shunt trip does not come from within the breaker, so it must be supplied from an external source.

Its most common application is when we need to control switching off the power of a panel by a feedback signal from the BMS system.


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