Fuses are essentially ﬁre breaks, points of deliberate weakness that, if power surges through a house’s electrical system, will collapse to prevent damage or ﬁre. This is achieved by the fuse’s central component, a strip or strand of metal which has a lower breaking capacity. The metal’s breaking capacity is the maximum current that can be passed through it safely, while anything above that will cause it to melt and break the circuit. Zinc, copper, silver and aluminium are all commonly used as fuse wire.
The fuse wire is then placed between two terminals, wrapped in a non-conductive material and then put in place. Then, if a power surge happens, the fuse will break, severing the connection, closing the circuit and minimising further damage.