Applying Interrupting Rating: Circuit Breakers

35 Generally, a Circuit breaker should not be applied where the available short- Circuit current at its line side terminals exceeds the Circuit breaker s Interrupting rating. This is a requirement per However, has anallowance for fuses or Circuit Breakers to protect downstream Circuit breakerswhere the available short- Circuit current exceeds the downstream circuitbreaker s Interrupting rating. The term given to this is a series rated combination, series rating, or series combination rating. The application ofseries ratings has many technical limitations and additional NEC requirements that must be met for proper application. Series rated combinations allowed per should be used sparingly. The most suitableand often the only proper application of series rated combinations is for branchcircuit, lighting panels. At the end of this section are tables of commerciallyavailable fuse/ Circuit breaker series rated combinations published by panelboard and switchboard manufacturers.

35 Generally, a circuit breaker should not be applied where the available short-circuit current at its line side terminals exceeds the circuit breaker’s

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  Breaker, Circuit, Circuit breakers

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