Patent Number: 7,820,933

Title: Puffer circuit breaker with an overpressure valve

Abstract: A circuit breaker comprises a puffer volume (9) and at least one overpressure valve (16) for discharging gas from the puffer volume (9), if the pressure therein exceeds a given threshold. The overpressure valve (16) is formed by a piston (17) and a spring (19) as well as by a cavity (18) in the stationary support body (10) of the moveable contact assembly (2). The overpressure valve (16) is of compact and simple design, has low hysteresis and large cross-section.

Inventors: Heiermeier; Helmut (Wutoschingen, DE), Kammerl; Kurt (Griessen, DE), Kehr; Timo (Birrhard, CH), Grob; Stephan (Baden, CH)

Assignee: ABB Technology AG

International Classification: H01H 33/88 (20060101)

Expiration Date: 2018-10-26 0:00:00