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Live Tank Circuit Breaker EDT with integrated current transformers 36 – 72.5 kV

Well proven circuit breaker based on modular design, factory assembled and tested for rapid installations

The EDF SK is a live tank SF6 AutopufferTM circuit breaker. It has a proven design and long performance in a vast range of environments and ambient conditions with an installed base in over 80 countries. The EDF breaker is type-tested to stringent conditions as per the latest IEC standard for high voltage circuit breakers, IEC 62271-100. 


  • Switching of Transmission Lines
  • Switching of Transformers 
  • Switching of Capacitor banks
  • Switching of Reactors

Why Hitachi Energy?

  • Proven self blast technology with low energy requirement  
  • Superior switching capability – Class C2 & S2 as per IEC 
  • Proven performance in extreme temperatures, from -50 °C to +50 °C
  • Compact design and easy installation
  • Factory assembled poles facilitate easy installation 
  • Global service organization, local everywhere 

Brief performance data

EDF SK 1-1  72.5 kV      
Rated voltage kV 52 72.5
Frequency Hz 50-60 50-60
Rated current* A 2500 2500
Rated Breaking current kA 31.5 31.5
Lightning impulse withstand level – LIWL** kV 250 325
 * for temp below +40 °C
** higer values on request
power plant engineer for substation

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