High Voltage HRC Fuse

• High-Magnitude Faults: Trigger rapid melting (short tripping time) due to intense Joule heating.
• Low-Magnitude Faults: Result in slower melting (longer tripping time), enabling coordination with other protective devices.

Arc Extinguishing Mechanism

• The fuse element melts, creating an arc.
• The enclosure, filled with quartz sand or other inert powders, reacts with the vaporized metal to form a high-resistance plasma.
• This plasma rapidly dissipates the arc energy, preventing re-ignition and ensuring safe circuit interruption.

Cartridge Type HV HRC Fuse
Design Features:

• Ring-Shaped Element: Wound to eliminate corona discharge, a high-voltage phenomenon causing energy loss and interference.
• Dual-Element Configuration (selected models):
  • Normal Current Path: A low-resistance copper or silver element handles steady-state loads.
  • Fault Current Path: A parallel tungsten element, optimized for high resistance and melting point, ensures rapid response to short circuits.
• Corona Mitigation: The toroidal shape equalizes electric fields, minimizing ionization and enhancing performance in HV environments.

Liquid Type HV HRC Fuse
Applications:

• High-voltage circuits (>400A), particularly transformer protection and industrial systems.

Construction

• Glass Tube Enclosure: Filled with carbon tetrachloride, a non-conductive liquid with excellent arc-quenching properties.
• Element Placement: The fuse element is immersed in the liquid, with one end sealed and the other connected via a phosphorous bronze wire.
• Arc Suppression: Upon melting, the element decomposes the liquid into non-conductive gases, rapidly extinguishing the arc and dissipating heat. This design excels in high-energy fault scenarios, outperforming dry-type fuses.

Backup Protection for Circuit Breakers

• Precision Fault Response: Reliable interruption across a wide current range.
• Safety: Airtight enclosures prevent explosive hazards and external arcing.
• HV Compatibility: Specialized designs address high-voltage challenges like corona and arc stability.

Limitations

• Single-Use: Requires replacement after operation.
• Environmental Sensitivity: Liquid-type fuses may require temperature compensation, and cartridge fuses necessitate periodic inspection.