Relay circuit having a test switch and method of testing a relay

Details Relay circuit having a test switch and method of testing a relay Relay circuit having a test switch and method of testing a relay

1994-10-27

1997-02-18

Gaffin, Jeffrey A.

Electricity: electrical systems and devices

Control circuits for electromagnetic devices

For relays or solenoids

361170, H01H 4700

Patent

active

056046570

ABSTRACT:
A relay circuit for energizing a load in response to a control device and method of testing the relay circuit, in which a switch is provided for selectively disconnecting the control device from the relay circuit and activating a relay switch such that the load is energized when in a test mode and reconnecting the control device when in an operational mode. By disconnecting the control device in the test mode, the control device may be electrically isolated from the relay circuit thereby protecting the control device from damage due to backfeeding.

REFERENCES:
patent: 1570416 (1926-01-01), Vassar
patent: 3058663 (1962-10-01), Barnard
patent: 4338649 (1982-07-01), Mosier
patent: 4879437 (1989-11-01), Dard et al.
patent: 5018043 (1991-05-01), Moreau

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