What is the role of fuse,


What is the role of fuse, used in series with any electrical appli-ances ? Why should a fuse with defined rating not be replaced by one with a larger rating ?


Electric fuse is a safety device. It protects the electrical appliance due to short circuiting and overloading in the electric circuit.

Fuse with defined rating means the maximum current that can flow’ through the fuse wire without melting it. As and when current exceeds this

maximum value, the fuse melts and the circuit is switched off. If fuse with defined rating is replaced by one with a larger rating, then large current

will flow through the circuit without melting the fuse. This large current may burn the electrical appliance connected in the circuit and the fuse will

not act as a safety device.

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