“Breaking Capacity” of the circuit breaker

“Breaking Capacity” 

During fault condition, the current passing through the CB is extremely high. CB must be capable to handle such huge current (Breaking Capacity). Huge arc is produced within the CB, which needs to be extinguished within a minimum time.

To prevent damage to the CB, the Breaking Capacity of the CB should be higher than the power generated during the fault. 

Circuit Breaker : Details