What Exactly Is an HRC Fuse?
HRC fuse (high rupturing capacity fuse) is one type of fuse in which the fuse wire transmits a short circuit current for a certain period of time. If a fault occurs in the circuit, it explodes. The HRC fuse is composed of glass unless another type of chemical compound is used.
The fuse’s cage can be firmly closed to keep air from the atmosphere out. The ceramic enclosure is formed with a metal cover fused with fusible silver wire on both sides of the fuse. Its enclosure comprises some space surrounded by wire that would otherwise be a fuse element.
HRC fuses are reliable and feature that if the fault current is strong, the break time is short. Similarly, if the fault current is low, the break time is prolonged.
Principle of Operation
Under normal circumstances, the current flowing through the fuse does not generate enough energy to soften the element. If a large current travels through the fuse, it melts the fuse element before the fault current reaches its climax.
When the fuse is in an overload condition, the fuse element will not blow off; nevertheless, if this condition persists for a lengthy period of time, a material such as Eutectic will dissolve and break the fuse element. When the fuse is shorted, the thin regions of the fuse element with the least area dissolve quickly and smash before the eutectic material. As a result, the restrictions inside the HRC Fuse element are provided.
HRC Fuse Construction
HRC fuse structure involves a material with a high heat resistant body, such as ceramic. This ceramic body has metal end caps soldered through a silver-current carrying element.
A filling powder material fills the internal space of the fuse body. Quartz, plaster of Paris, dust, marble, chalk, and other materials are used. As a result, the flow of current cannot overheat. The melted element is vaporised as a result of the generated heat. A chemical reaction will occur between the filling power and the silver vapour, resulting in a high resistance substance that will aid in the reduction of the arc within the fuse.
Because of its low specific resistance, copper or silver are commonly employed as fuse elements. This element usually has two or more components, and the fuse element is often composed of two or more parts joined together by tin joints. Tin has a melting point of 2400o C, which is lower than silver’s melting point of 980o C. As a result, the melting point of tin joints prevents the fuse from reaching high temperatures during a short circuit or overload.
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