What is a main difference between a circuit breaker and a fuse?

A circuit breaker can be reset, while a fuse must be replaced, distinguishing these two protective devices. A circuit breaker is designed to interrupt the electrical flow when it detects an overload or short circuit, and once the issue is resolved, the breaker can be reset to restore power, making it convenient for repeated use.

In contrast, a fuse works by melting a wire when the current exceeds its rating, which interrupts the circuit permanently until the fuse is physically replaced. This fundamental difference in functionality highlights the convenience and reusability of circuit breakers compared to fuses.

The other statements suggest various misconceptions about the operation and maintenance of these devices. Notably, the idea that a fuse is resettable is incorrect, just as the claim that both devices function the same way does not account for their distinct operational mechanisms. Additionally, the assertion about circuit breakers completely preventing electrical flow while fuses do not overlooks how both serve the purpose of protecting circuits from excess current.