08-09-2016, 11:02 AM
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INTRODUCTION
It is a weakest part of an electrical circuit which breaks when more than predetermined current flows through it.
Part of the circuit which consists of conductor which melts easily and breaks the connection when current exceeds the normal value.
Fuse is a primary protection component of each electronic/electric equipment or system
GENERAL FEATURES OF FUSE
A switching device, which by the fusion of one or more of its specially designed and
proportioned components open the circuit, in which it is inserted and breaks the current,
when the same exceeds a given value for a sufficient time. The term fuse covers all the parts
forming the complete switching device.
Characteristic nature of fuse wire
High resistance and high melting point
High resistance and low melting point
Low resistance and high melting point
Low resistance and low melting point
PRINCIPLE OF OPERATION
The operation of fuse depends upon the heating effect of an electric current. When the
electric current is increased in a circuit due to short circuits or over loads, it increases the rate
of heat generation, which will increase the temperature of the fuse wire and thereby the rate
of heat dissipation increases from the exposed surface of the fuse wire. The final temperature
reaches to such stage that the heat generation will be equal to the rate dissipation. If this
temperature happens to be above the melting point of the material for fuse wire, fuse must have operated