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live tank circuit breakers in use in 140 countries
for applications from 72.5 kV to 800 kV, up to 80 kA.
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.
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).
The new generation of high-voltage circuit breakers is based on over 40 years of experience in the production of medium-voltage vacuum interrupters and over 5.5 million units delivered.
Siemens has introduced this proven technology to high-voltage power networks above 72.5 kV.
The new vacuum circuit breakers feature reliable switching capacity, require no maintenance even when subject to frequent breaking operations, and are also environmentally friendly as they are free from greenhouse gases like SF6, for example.
The 3AT circuit breaker with double-nozzle system is especially suitable for special applications, such as the restrike-free interruption of low inductive and capacitive currents and the interruption of all types of short-circuits up to 80 kA, as well as HVDC applications.
Downloads, support and services
You can find details on our live tank circuit breakers and information about our services here.
You can find the right live tank circuit breaker for your applications to meet your requirements.