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Pioneering high performance breaker technology

Hitachi Energy pioneered the 800 kV dead tank breaker in the year 2000.  Now a mature offering, the breaker line features one mechanism per phase, high TRV and current potential for longer transmission lines and larger loads.

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?

  • High TRV withstand for long transmission lines
  • High current potential facilitates high load transmission 
  • Flexible design platform provides options for pre-insertion resistors, and various height-to-live part configurations
  • Short installation time due to factory pre-assembly
  • 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 800 kV   800PM
Rated voltage kV 800
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 2100
Operation type   Single-pole operated
Operating mechanism   HMB-8
MOV   Internal 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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