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Dead Tank Circuit Breaker 245 kV

High performance breaker with highest 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 offers 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, a dual motion interrupter 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 overvoltages.  Read more about it here or watch the video here.


  • 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
  • 10 year warranty on the HMB operating mechanism 
  • 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
  • Widely installed base in all environments and applications
  • Global service organization, local everywhere

Brief performance data

DTB 245 kV   242PMR 245PMG-B  245PMI-B  242PMG80  242PMI90  245PMov
Rated voltage kV 245 245 245 245 245  245
Short-circuit breaking current
kA 40 40-63 40-63 80 90  63-80
Rated current A 4000 5000 5000 5000 5000  5000
Break time cycles 3 2 2 2 2  2
Lightning impulse withstand level-LIWL kA 900, 1050 900, 1050 900, 1050 900, 1050 900, 1050  900, 1050
Operation type   Three-pole operated Three-pole operated Single-pole operated Single-pole operated Single-pole operated Three-pole or single-pole operated
Reactor protection   No MOV  No MOV  No MOV  No MOV  No MOV  MOV 
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