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Current Limiting Fuse For Cut-out Switch Fuse

The world’s first current-limiting fuse for COS (Cut-Out Switch) is an innovative solution that overcomes the limitations of Expulsion Fuses. Installed on medium-voltage distribution lines and on the primary side of pole-mounted transformers, it safely interrupts fault currents without generating arcs or noise, providing effective protection for transformers.

Application: Primary Side of Pole-Mounted Transformers

Key Features

  • No arc or noise during interruption, ensuring excellent fire prevention.
  • High-speed interruption (within 0.5 cycle) prevents momentary outages caused by recloser operation.
  • Adoption of a ceramic tube enhances resistance to heat, moisture, and salt.

Why Is a Current-Limiting Fuse for COS Essential?

“Expulsion fuses generate arcs during operation, posing a significant fire risk.”

Typical Fire Cases

Case1

Fire and Damage to Nearby Equipment

Typical Fire Cases

Case2

Massive wildfire in California caused by arc from aging transmission lines (Camp Fire, 2018)

The total damage is estimated at over USD 16 billion (approximately KRW 18 trillion).

Dimensions

Current Limiting Fuse For Cut-out Switch Fuse

1Type name system
2Ratings/Specificatoins

Expulsion Fuse vs. Current-Limiting Fuse: Comparison during Interruption

Tested under identical conditions at KEPCO’s Gochang Test Center.

  • Expulsion Fuse

    Expulsion Fuses generate arcs and loud explosions during interruption, creating fire hazards and causing both explosive noise and momentary power outages.

  • Current-Limiting Fuse

    Current-limiting fuses do not generate arcs or noise during interruption, preventing fires and ensuring operator safety.

Technical Achievements

  • Developed and applied the world’s first current-limiting fuse for COS (Cut-Out Switch)
  • Successfully completed KEPCO on-site technology development project (rated Excellent)
  • Adopted as the KEPCO standard for current-limiting DDO fuse (GS-5920-0030)
  • Verified by accredited testing institute (KERI)

Applicable Standards

  • GS-59250030:2018-11

Applied Patents

  • 1Apparatus of Gear-type coil fuse element and coil fuse element manufactured thereof (Korean Patent NO.10-1217784)
  • 2Cut-out Switch (Korean Patent NO.10-1670422)
  • 3Cut-out Switch provided with electric conductive member having elast (Korean Patent NO.10-2743029)