A fuse is a safety device that is designed to protect an electrical circuit from overcurrent. It consists of a metal wire or strip that melts when too much current flows through it, breaking the circuit and preventing damage to the electrical system.
A circuit breaker is a switch that automatically interrupts the flow of electricity in a circuit when it detects an overload or short circuit. It is designed to protect the electrical system from damage and prevent the risk of fire or electrical shock. Circuit breakers can be reset after they trip, unlike fuses which must be replaced.