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Disconnecting Circuit Breaker (DCB) 72.5 – 550 kV

The smart choice for maximum availability at a low total cost

A Disconnecting Circuit Breaker (DCB) provides the functionality of a circuit breaker and a disconnector combined in a single unit.

Without the need for separate disconnectors, up to 75 percent less space is required. Unplanned outages are reduced by up to 70 percent according Cigré report on high-voltage circuit breakers reliability, (group A3.06  October 2012), which means a low life-cycle cost.

Hitachi Energy's DCB is ideal for all substation applications – indoor, outdoor, greenfield or refurbishment. It offers the highest level of safety with the easily operated robust mechanical and electrical interlocking that supports the five golden safety steps for high voltage operations (interrupt, isolate, lock, voltage check, earth). The DCB is compliant with IEC standard 62271-108 for disconnecting circuit breakers.


  • Line, transformer, reactor and capacitor switching
  • Switching of harmonic filters
  • Switching in HVDC-applications
  • Switching in SVC-applications

Why Hitachi Energy?

  • Longest experience and largest installed base with DCB,1600 in service
  • The most complete product portfolio up to 550 kV, 63 kA
  • Low environmental impact – low global warming impact with less equipment, lower losses etc
  • Local and global Hitachi Energy industry and application support
  • Global service organization, local everywhere 

Brief performance data

170 - 245
362 - 550
Rated voltage kV  72.5 145  170-245 362-550 
Rated current 3150 3150 4000 4000
Rated breaking current kA 40  40 50 63
Ambient temperature °C -50  to +50 -50 to +50 -50 to +50 -50 to +50
power plant engineer for substation

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