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High performance breakers with up to 90 kA short circuit breaking current

A complete range of dead tank breakers at 245 kV provide options for applications with higher than standard asymmetry requirements (X/R ratio) and the highest short circuit capacity in the industry at 90 kA. Utilizing technology pioneered by Hitachi Energy and used across the industry today, the robust dead tank breaker line features slipover current transformers and requires no capacitors up to 63 kA. 
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?

  • Extreme 90 kA short circuit interrupting ratings and high asymmetrical fault capabilities

  • 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, reduce maintenance downtime and eliminate contamination risk

  • Widely installed base in all environments and applications

  • Global service organization, local everywhere

Brief performance data

DTB 245 kV   245PM50-SA 245PMG63-B | 245PMI63-B 245PMG80 | 245PMI80  245PMI90
Rated voltage kV 245 245 245  245
Short-circuit breaking current
kA 50 63 80  90
Rated current A ≤ 4000 ≤ 5000 ≤ 5000  ≤ 5000
Interrupting time cycles 3 2 2  2
Closing and latching current kA 130, 150 164 208 234
Lightning impulse withstand level-LIWL kV 900, 1050 900, 1050 900, 1050  900, 1050
Operation type*   Single-pole operated/
Three-pole operated**
Three-pole operated Single-pole operated Three-pole operated Single-pole operated Single-pole operated
Operating mechanism   FSA1 HMB-8 HMB-4 HMB-8 HMB-4 HMB-4

*   Single-pole operation also referred to as independent pole operation; Three-pole operation also referred to as gang operationt.
** Electrically ganged.

power plant engineer for substation

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