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Dead Tank Circuit Breaker up to 420 kV

High performance breakers with shortest circuit breaking current up to 80 kA

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 overvoltage’s.


  • Line, transformer, reactor and capacitor switching

  • Point-on-wave switching

  • High seismic applications

  • High altitude applications 

Why Hitachi Energy?

  • Enhanced safety and simplified maintenance

  • Rated up to and including 80 kA with no short-line fault capacitors 

  • Slipover current transformers that can be added or removed without disassembly, reducing maintenance downtime and eliminating contamination risk

  • 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 362PMI80
Rated voltage kV 362-420 362
Short-circuit breaking current
kA 40-63 80
Rated current A 5000 4000
Interrupting time cycles 2 2
Closing and latching current kA 104-164 216
Lightning impulse withstand level - LIWL kV 1300, 1425 1300
Operation type*   Single-pole operated Single-pole operated
Operating mechanism   HMB-4 HMB-8

* Single-pole operation also referred to as independent pole operation.

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