The difference between a fuse and a circuit breaker is __________.

The correct answer highlights a key characteristic that distinguishes circuit breakers from fuses. Circuit breakers are devices that interrupt the current flow in the event of an overload or short circuit but can be reset manually or automatically after the fault is cleared. This means once a circuit breaker trips, it can be reused without the need for replacement, which adds convenience and reduces downtime.

In contrast, fuses are designed to melt and break the circuit when the current exceeds a certain level. Once a fuse has operated, it must be replaced to restore the circuit functionality. This fundamental difference in functionality — the ability to reset and reuse circuit breakers versus the single-use nature of fuses — is crucial for understanding their applications in electrical systems.

By focusing on this aspect, the response emphasizes the importance of circuit breakers in offering a more sustainable and user-friendly solution for circuit protection, particularly in environments where frequent overloads may occur.