Electrical Engineering ⇒ Topic : Fuses
A fuse is a wire of short length or thin strip of material having low melting point and is inserted in an electric circuit as protective device to the flow of an excessive current through the circuit. The time for blowing- out of fuse depends upon the magnitude of the excessive current,.
The materials used for fuse wires must have the following characteristics :
1. Low melting point
2. Low ohmic loses
3. High conductivity
4. Free from deterioration.
For a round wire the approximate value of fusing current is given by
I= Kd3/2 called the ordinary "Fuse Law"
where K = constant,(depending on the metal of wire), and
d = diameter of the wire.
The ratio of minimum fusing current and current rating of fuse element is known as fusing factor. The fusing factor is always greater than unity
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