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Product overview

Overview of our live tank circuit breakers

We offer our live tank circuit breakers for applications from 72.5 kV to 800 kV, up to 80 kA. Depending on the requirement, you can choose from live tank circuit breakers with three-pole (one drive for three poles) or single-pole (three drives for three poles) operation, as well as from porcelain or composite insulators. Our live tank circuit breakers are suitable for all different types of applications, from use in extreme temperatures to earthquake regions. In these circuit breakers, the interrupter unit is not grounded during operation – it is exposed to high voltage.

Main features:

  • For applications from 72.5 kV to 800 kV, up to 80 kA
  • Spring drive mechanism (3AP) or electrohydraulic operating mechanism (3AT)
  • Self-compression principle (≤ 245 kV) or dynamic self-compression principle (≥ 245 kV)
  • Available with single- (FI, FE) or three-pole operation
  • Suitable for temperatures from -60 up to +55°C
  • Available with porcelain or composite insulators
  • Seismic withstand capability up to 0.3 g or 0.5 g
  • Gas leakage rate of less than 0.1 % per year
  • Type tested according to the latest international standards


  • Easy installation and commissioning: only few subassemblies
  • Inspection after 12 and maintenance after 25 years
  • 10,000 switching operations are guaranteed
  • Service life of up to 50 years
  • Over 107,000 circuit breakers delivered worldwide prove our best practices and years of experience
  • Minimal transportation costs
  • 24-hour service hotline
  • Our global production network saves customers time and transportation costs

Our live tank product families


3AP circuit breaker family from 72.5 kV to 800 kV

Our high-voltage live tank circuit breakers are available for three-pole operation with a common base (FG), for single-pole operation also with a common base (FE) or for single-pole operation with separate bases (FI). 3AP1 circuit breakers up to 300 kV are equipped with one interrupter unit per pole and 3AP2 circuit breakers up to 550 kV include two interrupter units. The circuit breakers can be equipped with optional closing resistors (3AP3) for applications from 362 kV to 550 kV. The 3AP4 includes 4 interrupter units per pole and can also be delivered with closing resistors on request (3AP5).

Technical Data

All values in accordance with IEC, other values on request