Electric switching device

Details Electric switching device Electric switching device

2005-11-01

2005-11-01

Sircus, Brian (Department: 2836)

Electrical transmission or interconnection systems

Switching systems

Condition responsive

C307S141800, C361S003000

Reexamination Certificate

active

06960844

ABSTRACT:
An electric switching device for alternating current comprises two branches (2, 3) connected in parallel in a current path and having each at least two contact members (4–7) connected in series. A semiconductor device (8) is adapted to interconnect the midpoints between the two contact members of each branch. When opening the current path a first contact member (5) of one, first branch located before said midpoint as seen in the current direction existing is controlled to open and a second contact member (6) of the second branch located after the midpoint as seen in the current direction is controlled to open for transferring the current to a temporary current path through the semiconductor device. The current path through the switching device is then broken when the semiconductor device is in a blocking state by opening a contact member (4, 7) of the switching device arranged in the temporary current path.

REFERENCES:
patent: 3864604 (1975-02-01), Pfanzelt
patent: 4203040 (1980-05-01), Abbondanti et al.
patent: 4754360 (1988-06-01), Nakada
patent: 5040417 (1991-08-01), Rowlette
patent: 5566041 (1996-10-01), Rumfeldt
patent: 2209500 (1973-06-01), None

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