Electrical System Protection
Fuses Vs. Breakers
If a circuit breaker is not properly maintained, it will derate and require re-calibration. The NEMA Low-Voltage Standard states “after a performance at or near its interrupting rating (IR), it is not to be inferred that the circuit breaker can again meet its IR without being inspected and if necessary, repaired.” If the breaker is put back into operation without being repaired, a serious safety hazard could exist. These maintenance issues do not exist with fuses because once they operate they are always replaced with a brand new fuse.
Electrical System Protection
