HRC (high rupturing capacity) fuse
In HRC fuse (high rupturing capacity fuse) the fuse wire or element can carry short circuit heavy current for a known time period. If the fault is removed during this time, then it does not blow off otherwise it blows off or melts.
The enclosure of an HRC fuse is made either of glass or some other chemical compound. This enclosure is fully air tight to avoid the effect of atmosphere on the fuse materials. The ceramic enclosure having metal end cap at both heads, to which fusible silver wire is welded. The space within the enclosure, surrounding the fuse wire or fuse element is completely packed up with a filling powder. This type of fuse is reliable and has inverse time characteristics, that means if the fault current is high then the rupture time is less and if fault current is not so high then the rupture time is long.
Operation of HRC Fuse
When the fault current flows through the fuse element of high rupturing capacity fuse the element is melted and vaporized. The filling powder is of such a quantity that the chemical reaction between the silver vapor and the filling powder forms a high electrical resistance substance which helps in quenching the arc.
The enclosure of an HRC fuse is made either of glass or some other chemical compound. This enclosure is fully air tight to avoid the effect of atmosphere on the fuse materials. The ceramic enclosure having metal end cap at both heads, to which fusible silver wire is welded. The space within the enclosure, surrounding the fuse wire or fuse element is completely packed up with a filling powder. This type of fuse is reliable and has inverse time characteristics, that means if the fault current is high then the rupture time is less and if fault current is not so high then the rupture time is long.
Operation of HRC Fuse
When the fault current flows through the fuse element of high rupturing capacity fuse the element is melted and vaporized. The filling powder is of such a quantity that the chemical reaction between the silver vapor and the filling powder forms a high electrical resistance substance which helps in quenching the arc.
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