Apparatus and method for protecting the contacts of an...

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G - Physics

08

B

348/1, 340/125

G08B 13/22 (2006.01) G08B 13/08 (2006.01) G08B 29/18 (2006.01) H02H 7/22 (2006.01) H01H 3/00 (2006.01) H01H 9/54 (2006.01) H01H 36/00 (2006.01)

Patent

CA 1321417

-35- APPARATUS AND METHOD FOR PROTECTING THE CONTACTS OF AN ELECTRICAL SWITCH FROM CURRENT SURGES Abstract of the Disclosure The contacts of an electrical switch, such as a magnetic contact reed switch or a magnetic contact reed relay used in a burglar alarm system, are protected from being fused together by transient current surges. This protection is accomplished by providing a normally nonconductive shunting path in parallel with the switch. The shunting path includes a voltage responsive device which is biased to conduction in response to a current surge to thereby complete the shunting path and allow the current surge to bypass the switch.

589541

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