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Flexible design platform for a wide range of applications

The 550 kV Dead Tank Breakers can be equipped with pre-insertion resistors and are tested for high transient recovery voltage (TRV) performance, high mechanical endurance and switching capabilities.  Installation time is greatly reduced due to control wire bundling.

For shunt reactor protection, Hitachi Energy now offers Dead Tank Breakers with applied Metal Oxide Varistors (MOVs).  This solution increases the reliability of the breaker by limiting damaging overvoltages.


  • Line, transformer, reactor and capacitor switching
  • Point-on-wave switching
  • High seismic applications
  • High altitude applications

Why Hitachi Energy?

  • Flexible design platform provides options for pre-insertion resistors and various height-to-live part configurations
  • Short installation time due to factory pre-assembly 
  • High TRV withstand
  • High rated current options
  • 10 year warranty on the HMB operating mechanism
  • Widely installed base in all environments and applications
  • Global service organization, local everywhere

Brief performance data

DTB 550 kV   550PM
Rated voltage kV 550
Short-circuit breaking current* kA 40-63
Rated current A up to 5000
Interrupting time cycles 2
Closing and latching current kA 104-164
Lightning impulse withstand level - LIWL kV 1800
Operation type   Single-pole operated
Operating mechanism   HMB-8
MOV   Internal or External MOV
Service conditions    
- Ambient temperature* °C -30 to +40
- Design altitude* m 1000

* Other options available, contact factory for additional information.

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