Molded Case Circuit Breakers

 
By 26 August 2014
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These are circuit breakers with tripping mechanisms and terminal contacts assembled together in a molded case.

This helps in getting high die-electric strength as well as mechanical strength to it. In addition, an arc chute is provided to increase the length of the arc and at the same time restricting hot gases that come in contact with the important parts of the breaker.

Molded case circuit breakers (MCCB) with ratings up to 3000 A are capable of interrupting currents up to 200 kA. These are used for the control of low-voltage networks.