(Fault Interrupter (Solid) 2019-08-30T03:47:50+00:00

Fault Interrupter (Solid)


The Joongwon Fault Interrupter is designed to meet increasing requirement of the electric utility industry, providing a safe, maintenance free, long life, economical device to perform fault current interrupting on overhead distribution lines. The Joongwon Fault Interrupter is applicable to 24kV(max.27kV) power distribution systems and substation. It can be operated manually or electrically via controller should be mounted to the pole mounting frame.

  • Ability to perform as a recloser, sectionalizer or automated load break switch
  • Proven design rated for 10,000 full load operations
  • Hydrophobic Cycloaliphatic Epoxy (HCEP) insulation provides industry leading reliability
  • Stainless steel construction for durability in any environment
  • Air insulation for an environmentally friendly design
  • Minimal maintenance required for the high voltage unit


Rated system voltage(kV) 25.8(max. 27)
Rated continuous current(A)  400 800
Power frequency withstand voltage(kV)  
Dry (1min.)  60
Wet (10sec.) 50
Lighting impulse withstand voltage (1.2×50μs)(kV)  150
Rated power frequency(㎐)  60
Short-circuit breaking current(kA) 12.5
Short-circuit making current(kA) 32.5
Rated short-time withstand current(kA/1s, rms) 12.5
Rated interrupting time(sec) 0.050
Rated closing time(sec) 0.070
Insulating medium Epoxy
Ambient temperature(℃)  -30 to 50
Ambient humidity(%) ≤ 100
Altitude(m)  ≤ 1 000
Mechanical endurance(times) 5,000 times
Rated control voltage AC 220 V / DC 24V
Weight(body)(kg) 160
Weight(controller)(kg)  40
Operating method Auto Manual Auto
Applied standard IEC 62271-111 & KEPCO spec.