Fuses are commonly found inside electrical plugs.

The purpose of the fuse is to protect the delicate, low voltage electronics found inside all electrical appliances. It prevents too much electricity flowing into the appliance if a fault occurs, such as a wire coming loose. If the flow of electricity becomes greater than a certain level, the fuse will "blow".

The fuse is really a thin wire inside a glass or ceramic cartridge.

When the fuse "blows" the thin wire melts and the electricity supply to the appliance is cut off. Some fuses, usually the low voltage ones, have a glass cartridge and you will be able to see if the wire inside is broken. The fuse inside most household appliance plugs, however, is usually a ceramic cartridge and you will not be able to see the wire inside. It is for this reason that a fuse tester is needed.

Fuses are quite delicate. If the fuse is old, or it has been dropped, it could "blow" even if there is no fault in the appliance.

The main switch allows you to turn off the electricity supply to

Circuit breakers and RCDs are protective devices that will interrupt the flow of electrical current if the circuit concerned develops a fault. Instead of a modern consumer unit with circuit breakers and RCDs, some older houses have fuse boxes with rewireable fuses.

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