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. How to wire a house fuse box The proper wiring of a house fuse box is in itself a safety feature to prevent power surges and potential fire risks throughout your home. Wiring a house fuse box can be done with confidence by following proper and established safety practices.