High voltage vacuum
circuit breaker

The OVX720 is a specially designed solid insulated vacuum circuit breaker modularized in 1-2-3 pole configurations. For railway feeder stations it comes with 1 & 2 poles construction, and with 3 poles for electrical transmission system. The product has extremely high mechanical endurance and outstanding electrical parameters with solid insulation and with high performance vacuum interrupters. This combination provides highly reliable maintenance free products with low life cycle costs. Gas free product, environmentally friendly.

Hughes Power System high voltage circuit breaker
  • High quality mechanical parts
  • Low life cycle cost
  • High level of insulation
  • Innovative design
  • Silicone insulators
  • Easily remotely controlled


  • Solid insulated;
  • 72.5 kV 3-phase;
  • 42 kV single or double pole;
  • 2500 A, 31.5 kA;
  • 365 kV BIL;
  • 140 kV PF@ 50 Hz;
  • Stored energy mechanical actuator;
  • Solutions for 1-phase, 2-phase, 3-phase systems;
  • Vacuum interrupter enclosed in a solid insulation with silicone surface;
  • Anti-vandalism poles fitted with polymeric insulators as standard;

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Hughes high voltage vacuum circuit breaker


Description ovx721 ovx722 ovx723
Type circuit breaker circuit breaker circuit breaker
Rated frequency 50/60 Hz 50/60 Hz 50/60 Hz
Operating voltage (phase to ground) 42 kV 42 kV  
Operation voltage (phase to phase)     72 kV
Rated power frequency withstand voltage (50 Hz/1 min) 140 kV 140 kV 140 kV
Lightning impulse withstand voltage (1.2/50 μs) 325 kV 325 kV 325 kV
Rated current 2500 A 2500 A 2500 A
Rated short-circuit breaking current 31.5 kA 31.5 kA 31.5 kA
Rated short-circuit making current 80 kA 80 kA 80 kA
Short circuit withstand current 31.5 kA/3 s 31.5 kA/3 s 31.5 kA/3 s
Operation mechanism stored energy stored energy stored energy
Number of poles 1 2 3
Opening time ≤ 17 ms ≤ 22 ms ≤ 22 ms
Closing time ≤ 60 ms ≤ 60 ms ≤ 65 ms
Insulators polymeric polymeric polymeric
Operating class (IEC 62271-100) E2 E2 E2
Height x Length x Width 1990 x 840 x 620 per module
Operation voltage 24 VDC, 110 VDC, 220 VAC
Drive voltage 24 VDC, 110 VDC, 220 VAC

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