ETYM For fusee, fusil a firelock.
1. Any device by which an explosive charge is ignited; SYN. fuze, fusee, fuzee, primer.
2. Can interrupt the flow of electrical current when it is overloaded; SYN. electrical fuse.
A circuit element that burns out or breaks when the current passing through it exceeds a certain level. A fuse protects a circuit from damage caused by excess current. It performs the same function as a circuit breaker, but it cannot be reset, so it must be replaced if it breaks. A fuse consists of a short length of wire of a specific composition and thickness; the thicker the wire, the more current it can pass before the wire melts and breaks the circuit.
In electricity, a wire or strip of metal designed to melt when excessive current passes through. It is a safety device to stop at that point in the circuit when surges of current would otherwise damage equipment and cause fires. In explosives, a fuse is a cord impregnated with chemicals so that it burns slowly at a predetermined rate. It is used to set off a main explosive charge, sufficient length of fuse being left to allow the person lighting it to get away to safety.

1. To become plastic or fluid or liquefied from heat.
2. To equip with a fuse; provide with a fuse.
3. To make liquid or plastic by heating.