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LTA Disconnecting Circuit Breaker (DCB)

The eco-efficient Disconnecting Circuit Breaker (DCB) makes use of a CO2-based gas mixture as the insulating and arc extinguishing medium as an alternative to SF6.

A DCB provides the functionality of a circuit breaker and a disconnector combined in a single unit. Without the need for separate disconnectors, up to 65% less space is required. Hitachi Energy's DCB is suitable for outdoor and indoor substation applications.

The DCB is also available as with eco-efficient alternative gas-mixture as the insulating and arc extinguishing medium. The LTA DCB enables a Global Warming Potential (GWP) reduction of almost 100%.

With the web tool you can evaluate space and cost savings by comparing a DCB solution with an array of traditional substations designs.


  • Line switching
  • Transformer switching

Why Hitachi Energy?

  • The LTA´s gas-mixture has a Global Warming Potential (GWP) < 1 vs 23,500 of SF6
  • Close to 100% GWP reduction compared to conventional breakers
  • Future-proof solution to comply with environmental regulation changes
  • Based on well-proven Hitachi Energy's high-voltage breakers technology

Brief performance data


 Rated voltage kV 72.5  145
 Rated current A 2750  3150
 Rated breaking current kA 31.5  40
 Ambient temperature C -50  / + 40  -50  / + 40
Ingénieur de centrale électrique
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