Circuit breaker having semi-moving piston

Details Circuit breaker having semi-moving piston Circuit breaker having semi-moving piston

1997-11-24

1999-01-12

Friedhofer, Michael A.

High-voltage switches with arc preventing or extinguishing devic

Arc preventing or extinguishing devices

Air-current blowout

H01H 3391

Patent

active

058593993

ABSTRACT:
A puffer type circuit breaker comprising a compression chamber closed by a pressure wall of a semi-moving piston, a first mechanism for preventing the piston from moving during a first portion of the opening displacement of the moving contact assembly, and a second mechanism for axially displacing the piston together with the moving contact assembly during the second portion of the same displacement. The piston includes a cylindrical guide portion secured to the wall. The first mechanism comprises an abutment member disposed between the end of the guide portion of the piston and a fixed retaining part, said abutment member being retractable. The second mechanism comprises an arrangement for retracting the abutment member, and acting at the end of the first displacement portion.

REFERENCES:
patent: 4511775 (1985-04-01), Korner et al.
patent: 4556767 (1985-12-01), Egli et al.
patent: 4945197 (1990-07-01), Thuries et al.
patent: 5001314 (1991-03-01), Thuries et al.

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