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The circuit breaker, with rated voltage 72.5-245 kV and breaking current up to 50 kA, satisfies the highest demands. It is based on latest developments in dielectric dimensioning and arc physics research.

For circuit breakers with one breaking element per pole, both modes of operation are possible. For three-pole operation, the circuit breaker poles

and the operating mechanism are linked together with pull rods. On every pole there is an individual opening spring controlled by the pull rod. There is however one exception. In the three-pole operation case there is only one opening spring controlling all three poles and it is mounted on the pole furthest away from the operating mechanism.

Each circuit breaker pole constitutes a sealed SF6 filled unit, which includes the breaking unit, the hollow post insulator and the mechanism housing.

The three poles of the circuit breaker can be mounted on individual pole supports or in the case of the circuit breaker on a common support frame (pole beam).

The operational reliability and the service life of an SF6 circuit breaker is very much dependent on the ability to ensure sealing of the SF6 gas volume and to neutralize the effects of moisture and decomposition products in the gas.

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