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Examoogle • User • info@examoogle.com • EE-2024-8821
Chapter 1 of 12 • Page 1 of 248🔒 Protected PDF • Watermarked
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Full name of HRC
High rating current
High rated capacity
High rupturing capacity
None
High rupturing capacity
Quick Summary: HRC stands for High Rupturing Capacity. It is a type of fuse that is specifically designed to clear high short-circuit fault currents safely by quenching the arc generated during the blowing process using a filling material like quartz sand.
HRC stands for High Rupturing Capacity. It is a type of fuse that is specifically designed to clear high short-circuit fault currents safely by quenching the arc generated during the blowing process using a filling material like quartz sand.
Irc=Irms×2 — where Irc is the peak rupturing capacity current
I2t=K — represents the pre-arcing energy withstand capability
When a fault current exceeds the rated value, the fuse element melts. The chemical reaction between the molten silver element and the surrounding quartz sand filler forms a high-resistance fulgurite, which helps in arc extinction and limits the current magnitude to a safe level.
HRC fuses are capable of breaking very high fault currents.
They provide reliable protection against short circuits.
The filler material (typically quartz sand) prevents the arc from re-striking.
They are non-deteriorating and provide inverse time-current characteristics.
Extremely high breaking capacity
Consistent and reliable performance
No aging of the fuse element
Provides clear visual indication of operation
Fuse element must be replaced after operation
Cannot be used for switching purposes
Replacement cost is higher than rewirable fuses
Industrial power distribution boards
Motor starter circuits
Transformer primary protection
Low voltage power networks
HRC fuses are strictly defined under IS 2208/IS 9224 standards in India.
The 'High Rupturing' refers to the ability to break heavy currents without damage to the enclosure.
C is correct — HRC stands for High Rupturing Capacity, referring to the fuse's ability to safely interrupt high magnitude fault currents.
Always remember that HRC fuses are not intended for overload protection but specifically for short-circuit protection; their I-t characteristic is inverse time.