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Horizontal center break disconnector GW55

Maximum reliability and minimal maintenance

The GW55 disconnectors are available upto 245 kV, 3150 A and 50 kA. These disconnectors have a low friction design and offer minimized contact resistance. They are equipped with interlocking for reliability in extreme conditions. Some other important features of these disconnectors are:

  • Contact plates with self-cleansing capability
  • Contact pressure kept unchanged by stainless springs
  • Superior design of mechanical interlock
  • Ice breaking capacity


The horizontal center break disconnector is used at substations due to its simplicity and flexibility in arrangement.

Why Hitachi Energy?

  • Worldwide experience
  • Maximum reliability and minimal maintenance
  • Energy efficient solution
  • Easy and quick erection
  • Reliable and smooth operation
  • Suitable for wide range of environmental conditions

Brief performance data

Rated voltage (kV) 72.5 123 145 245
Rated current (A) up to 3150
Short time withstand current (kA) up to 50
Power frequency withstand voltage (kV)        
· against earth 140 230 275 460
· across isolating distance 160 265 315 530
Lightning impulse withstand voltage (kV)        
· against earth 325 550 650 1050
· across isolating distance 375 630 750 1200

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