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Asked by Nitin Last Modified
Answer 
A fuse consists of a metal strip or wire fuse element, of small cross-section compared to the circuit conductors, mounted between a pair of electrical terminals, and (usually) enclosed by a non-combustible housing.
Commonly used material are copper, zinc, aluminium. Fuse works on I^2 x R principle. The heat developed by excess current will melt the fuse wire. Eg. At full load your house/motor/ appliance draws a specific amount of current lets say 5Amps. So fuse wire is set to a bit higher value like 5.5/6/7 Amps. 5Amps is not selected because you need 5A for the appliance to work, at 5A the fuse will burn. So you select a value slightly higher than 5Amps. You want the fuse wire to melt above 5Amps so that your device is not damaged. In this way your appliance is protected.
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