The answer to 'difference between circuit breaker and fuse' is that circuit breakers and fuses are both electrical safety devices used to protect electrical circuits from overloads and short circuits, but they work in different ways. Circuit breakers are reusable devices that can be reset after they trip, while fuses are one-time devices that need to be replaced after they blow.
Circuit breakers use an electromagnetic mechanism to detect when too much current is flowing through the circuit, and they automatically shut off the power to prevent damage. Fuses have a metal wire or strip that melts when too much current flows through it, breaking the circuit. Circuit breakers are generally more convenient because they can be reset, but fuses may be less expensive and can provide faster protection in some situations.