A fuse is an over current protection device used in electrical circuit. A fuse interrupts excessive current (blows) so that further damage by overheating or fire is prevented. A fuse consists of a metal strip of mounted between a pair of electrical terminals, and enclosed by a non-conducting and non-combustible housing. The fuse is arranged in series to carry all the current passing through the protected circuit. If high a current flows, the element rises to directly melt the fuse. The fuse element is made of zinc, copper, silver, aluminum, or alloys.
When the load capacity is very high the level of fault current will also increase. So faulty clearing device will be under heavy stress.HRC fuse is preferred for heavy duty and rapid operation. It consists of heat resisting ceramic cylindric body having low co-efficient of thermal expansion. The fuse element is made up of silver or silver alloy to improve fuse life. It is filled with incombustible powder which absorbs the arc produced at the time of blowing.The rating is much more accurate. It is widely used because of silent operation and non-deteriorating characteristics. It is maintenance free and easy to install.
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