For what purpose are time delayed or delayed action-type fuses used?
Official USCG Answer & Rule Citation
Correct Answer: Option A — permit momentary overloads without melting
Time-delay fuses incorporate thermal inertia to tolerate harmless temporary current surges, such as motor starting inrush, without prematurely opening. This complies with IEEE 45 and 46 CFR Subchapter J selective coordination requirements for shipboard machinery.
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