Marine Electrical Systems USCG Question #1249 (Set 42)

How are fuses usually rated?

Official USCG Answer & Rule Citation

Correct Answer: Option D — volts, amps, and interrupting capacity

Fuses are rated by voltage, current, and interrupting capacity (IC). The voltage rating ensures the fuse can extinguish the arc upon blowing, the amperage defines the continuous load capacity, and the IC specifies the maximum fault current the fuse can safely clear without exploding or failing to interrupt the circuit.

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