Question

fuse help in protecting and electrical appliance

Answer 1

The fuse breaks the circuit id a fault in an appliance causes too much current to flow.This protects the wiring of the appliance.

Answer 2

Hey Friend,

Fuse is a safety device in an electric circuit.

Fuse is the weakest point in an electric circuit and it melts and breaks the electric circuit. 
The fuse melts in the following two cases -
(i) when circuit gets overloaded due to large withdrawal of current
(ii) due to short circuiting in the electric circuit
(iii) due to fluctuation of current in the power supply system

So, Fuse acts as a safety device by preventing the above situations and saving the appliance along with the user from fatal shock etc...

Hope it helps!!!