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Dead Tank Circuit Breaker 72.5 kV

Robust design for all extremes

The 38-72.5 kV Dead Tank Breakers are designed to excel in a broad range of power applications. Utilizing technology pioneered by Hitachi Energy and used across the industry today, the dead tank breaker line features slipover current transformers as well as independent pole capability and self-blast interrupters.


  • Line, transformer, reactor and capacitor switching
  • Point-on-wave switching
  • High seismic applications
  • High altitude applications

Why Hitachi Energy?

  • Independent pole operation available for synchronous switching and greater system reliability
  • 45 kA interrupting rating is suitable for application on systems with higher than standard fault duties or current asymmetry (X/R Ratio), eliminating the need for costly system modifications 
  • Slipover current transformers that are added or removed without disassembly, reducing maintenance downtime and eliminating contamination risk
  • Spring-spring operating mechanisms
  • Widely installed base in all environments and applications
  • Global service organization, local everywhere

Brief performance data

DTB up to 72 kV   72PM40-SD 72PMI40-SD
Rated voltage kV 72.5  72.5
Short-circuit breaking current
kA 40 40
Rated current A 3150 3150
Interrupting time cycles 3 3
Closing and latching current  kA 104 104, 120
Lightning impulse withstand level - LIWL kV 350 350
Operation type*   Three-pole operated Single-pole operated
Operating mechanism   FSA1 FSA1

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

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