Apparatus and method for protecting the contacts of an electrica

Details Apparatus and method for protecting the contacts of an electrica Apparatus and method for protecting the contacts of an electrica

1988-02-09

1989-07-11

Jennings, Derek S.

Electricity: electrical systems and devices

Safety and protection of systems and devices

Arc suppression at switching point

361 5, 361 6, 361 8, 361 11, 361 91, 361 93, 335156, 340547, 340545, H02H 320

Patent

active

048477192

ABSTRACT:
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.

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