Composite safety switch

Details Composite safety switch Composite safety switch

1995-01-25

1996-09-24

Wieder, Kenneth A.

Electricity: measuring and testing

Electromechanical switching device

Relay

324422, 340644, H03K 19007

Patent

active

055594387

ABSTRACT:
A composite switch is constituted by a series or parallel association of at least two simple switches. Each simple switch includes an element for measuring the current in the simple switch in the case of a parallel association; an element for measuring the voltage across the simple switch in the case of an association in series; and a control circuit receiving the information provided by the measuring elements as well as a control signal from the simple switch, and providing an active failure signal if the measured voltage is high or the measured current is low while the simple switch is controlled to be turned on, or if the measured current is high or the measured voltage is low while the simple switch is controlled to be turned off.

REFERENCES:
patent: 4664870 (1987-05-01), Hager
patent: 4687623 (1987-08-01), Cook
patent: 4696785 (1987-09-01), Cook et al.
patent: 4697093 (1987-09-01), Sutherland et al.
patent: 4843537 (1989-06-01), Arita
patent: 4980573 (1990-12-01), White et al.
patent: 5006301 (1991-04-01), Lexa
patent: 5272441 (1993-12-01), Wright

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