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Dead Tank Circuit Breaker 362-420 kV

Installation time of less than 16 hours

The 362-420 kV rated Dead Tank Breakers provide robust performance at a low cost of ownership.  Tested for high transient recovery voltage (TRV) performance applications, mechanical endurance and switching capabilities and designed for the toughest transmission applications.

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?

  • Installation time of approximately 16 hours as the breaker is shipped in only 4 sections (3 pressurized poles with bushing and mechanism attached, and frame with associated control housing)
  • Enhanced safety and simplified maintenance
  • Rated up to and including 63 kA with no external line to ground capacitors 
  • Slipover current transformers that are added or removed without disassembly, reducing maintenance downtime and eliminating contamination risk
  • 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 up to 420 kV   420PM-HB 362PMR-HB
Rated voltage kV 362-420 362-420
Short-circuit breaking current*
kA 40-63 40-63
Rated current A 5000 5000
Break time cycles 2 2
Closing and latching current kA 104-164 104-164
Lightning impulse withstand level - LIWL kV 1300, 1425 1300, 1425
Operation type   Single-pole operated Single-pole operated
Operating mechanism   HMB-4 HMB-4
MOV   External MOV No standard MOV**
Service conditions      
- Ambient temperature* °C -30 to +40 -30 to +40
- Design altitude* m 1000 1000

* Other options available, contact factory for additional information.
** Available by request.

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