The main function of the fuse is to prevent excessive current. The main function of the fuse is to provide overcurrent protection, of either the load or source circuit. Its essential component is a metal wire or strip that melts when too much current flows through it, interrupting the circuit that it connects. Short circuits, overloading, and mismatched loads are the prime reasons for excessive current. Fuses can be used as alternatives to circuit breakers.
It's essential component is a metal wire or strip that melts when too much current flows through it, thereby stopping or interrupting the current.
It is a sacrificial device; once a fuse has operated it is an open circuit and must be replaced or rewired, depending on its type