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

Compact multifunctional module energized in less than 8 hours at site

The EDT SK is a combined apparatus including an ED type SF6 live tank circuit breaker, with a central compartment per pole, including an integrated current transformer. By eliminating high voltage connection between the circuit breaker and the instrument transformers, energy losses and thereby overall life-cycle costs are reduced.

The circuit breakers are available for single or three pole operation. Each set of current transformers has two primary ratios and up to three secondary windings.


  • Switching of power transformers and high voltage lines
  • Switching of capacitor banks, reactors and filters
  • Revenue metering
  • Mobile substations

Why ABB?

  • Compact design with integrated current transformers
  • Factory assembled poles that facilitate easy installation at site in less than 8 hours
  • No extra testing needed at site as the unit is tested at the factory
  • Increased reliability and availability
  • Global service organization, local everywhere 

 Brief performance data

EDT SK 1-1  72.5 kV
Rated voltage kV 36 - 72
Frequency Hz 50 - 60
Rated current A up to 1600
Rated Breaking current kA 25 - 31.5
Primary current A

100/200 to 800/1600

Secondary current  A  1 - 5
Protection  VA   10 - 30 , 5P20
Measurement  VA  10 - 30, Class 0.2s, 0.2 and 0.5

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