How does a fuse work?

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When current that is higher than the fuse rating flows through the circuit, the wire in the fuse melts and breaks the circuit.

This will prevent the high current from flowing through the wirings and the electrical appliance, preventing overheating of the wires, and damage to the appliance.

A glass fuse. The fuse wire can be seen.
The standard fuse ratings are: 1A, 2A, 3A, 5A, 7A, 10A and 13A. Most electrical appliances in Singapore use the 13A fuse.