Final answer:
A circuit breaker serves the same protective function as a fuse but can be reset and reused instead of being replaced after a single use.
Step-by-step explanation:
A circuit breaker serves the same function as a fuse but can be used multiple times. Unlike fuses, which contain a piece of wire that melts and breaks the circuit when too much current flows through it, circuit breakers are designed to trip and interrupt the current flow when they detect an overload or short circuit. Once tripped, a circuit breaker can be reset by simply turning it off and then back on, making it a convenient and reusable safety device to protect electrical circuits.