Power circuit breaker having little liquid

摘要

The extinguishing chamber (7) of the power circuit breaker is connected to a sight glass (10) via a passage (6), which is located below the required level (N) of the circuit-breaker oil and is cut out in an insulating support (2) of the pole column, and via an external line (9) which is connected thereto, said site glass (10) being located at said level. A non-return valve (8, 15) which is fitted in the passage separates the extinguishing chamber from the line (9) in the event of an overpressure occurring suddenly in the extinguishing chamber (7) of the pole column (1). <IMAGE>