NEIEP Electrical Fundamentals (360) Practice Test

What is the primary functional difference between a fuse and a circuit breaker?

Fuse conducts until it melts; breaker trips and can be reset. Breaker trips and can be reset; fuse melts and must be replaced. Both devices operate identically and are interchangeable. Breaker melts its element and needs replacement.

Correct Answer:

Fuse conducts until it melts; breaker trips and can be reset.

Explanation:

The main idea is how each device stops current after an overload and whether it is reusable. A fuse carries current normally until a fault causes its thin metal element to heat up and melt, opening the circuit; once it has blown, it must be replaced. A circuit breaker detects the fault and trips to open the circuit, but it can be reset afterward by flipping the switch once the fault is cleared. So the fuse is sacrificial and single-use, while the breaker is resettable and reusable. That’s why the correct description is that a fuse conducts until it melts and must be replaced, whereas a breaker trips and can be reset.

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