How Do Fuses and Fuse Boxes Work? - The Spruce A fuse box is a type of electrical service panel, which is a sort of control board for the entire electrical system of a housee any home built around 1960 or later has a service panel full of circuit breakers, panels in older houses used fuses to provide over-current protection for the household circuits. A fuse box has a series of threaded sockets into which the fuses are screwed in likeAuthor: Bob Formisano Fuse Boxes Explained | Electrical Safety First Fuses (may be found in place of circuit breakers) – rewirable fuses have a piece of special fuse wire running between two screws. When a fault or overload current flows through the fuse wire, it will become hot and melt. The melted fuse breaks the circuit, disconnecting the faulty circuit and keeping you safe.