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Dead Tank Circuit Breaker 123 -170 kV

Compact and preset from factory for rapid installation

The 123-170 kV Dead Tank Breakers feature a small footprint and a single piece interrupter with factory aligned contacts that reduce installation and maintenance costs.


  • 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 70 kA with no external line to ground capacitors
  • Spring-spring operating mechanism available up to 40 kA 
  • 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
  • 10 year warranty on the HMB operating mechanism for 63 kA breakers

Brief performance data

DTB 145/170 kV   145PM40-B 145PM40-C 145PM63-B 145PMI
Rated voltage kV 123-170 123-145 123-145 123-145, 170
Short-circuit breaking current kA 40 40 40-63 40-63, 40-50
Rated current A 3150 3150 4000 4000
Break time cycles 3 3 3 3
Closing and latching current kA 104 104 104-164 104-164, 104-130
Operation type   Three-pole operated Three-pole operated Three-pole operated Single-pole operated

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