What is meant by H.R.C fuse?


HRC fuse (high rupturing capacity fuse) is one kind of fuse, where the fuse wire carries a short circuit current in a set period. If the fault occurs in the circuit then it blows off. The HRC fuse is made with glass otherwise some other kind of chemical compound.

The enclosure of the fuse can be closed tightly to avoid the air from the atmosphere. At both sides of the fuse, the ceramic enclosure is made with a metal cap which is welded with fusible silver wire. Its enclosure includes some space that is surrounded by wire otherwise elements of the fuse.

HRC fuse is consistent & it has the feature that if it has a high fault current then break time is low. Similarly, if the fault current is not high, then the break time is long.

HRC fuses are used to protect high voltage switch gears from short circuits. Used for backup security. This type of fuse is also used in motor stators. Used for protection of electrical appliances such as motors, transformers, automobiles, etc.

Under normal operating conditions the current flowing through the Fuse element does not provide enough energy to melt the element. The heat produced is absorbed by the surrounding filling powder. 

If a large current flows the energy produced melts and vaporizes the fuse element before the fault current reaches the peak. The chemical reaction between the fuse element vapor and filling powder results in high resistance material which helps in extinguishing the arc.



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