Fuse is a piece
of wire of a material with a very low melting point. When a high current
flows through the circuit due to
the wires gets heated and melts. As a result, the circuit is broken and
current stops flowing.
It must be remembered that fuse wire is always
connected to the LIVE wire.
Properties Of Reliable Fuse :-
Fuse must be of correct value. For example, In a 15A
circuit, the fuse wire used is thick and of 15A rating.