Answer / dhedhipya

First Understand this,
Rated current of fuse: It means that the current a fuse can
withstand for an indefinite period without any undue heating
or melting.
Rupture rating is also a similar term it is the capacity
fuse to withstand the damage due to arcs created.
HRC fuse is also called High Voltage Explosion Fuses.
HRC fuse is used in Large Power Houses. The common fusing
element is silver, copper and tin. These fuses surround the
fusible link with gas evolving substances, such as boric
acid and silicon dioxide(sand). Some special type fuses
surround one or more parallel connected fusible links. When
fuse blows, heat from arc causes boric acid to evolve large
volumes of gases. The associated high pressures and cooling
gases rapidly extinguish the resulting arc. The hot gases
are then explosively expelled out of the end.

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