It's a safety device put in almost all electrical appliances and in all electrical systems (such as your house, and car). Should there be a power-surge or a short-circuit somewhere in the appliance or system the fuse will "blow" breaking the circuit and stopping the flow of electricity. this is done by having the centre of the fuse contain a wire which can only allow a certain amount of current through, if this current is exceeded, the wire will burn away/melt.
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