circuit breaker

The OVX720 is a part of the OVX product range and is a specially designed solid insulated vacuum circuit breaker intended for railway power supply in 1-2-3 pole configuration. It is designed as a heavy-duty outdoor circuit breaker for railway feeder stations. The product has extremely high mechanical endurance and outstanding electrical performances with solid insulation and with high performance vacuum interrupters. This combination provides highly reliable maintenance free products with low life cycle costs.

Hughes Power System Modularized 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;
Hughes modularized 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) 70 kV 70 kV 70 kV
Lightning impulse withstand voltage (1.2/50 μs) 170 kV 250 kV 250 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 ≤ 60 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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