Circuit for testing two switch or relay contacts simultaneously

Details Circuit for testing two switch or relay contacts simultaneously Circuit for testing two switch or relay contacts simultaneously

1993-11-18

1996-08-13

Snow, Ealter E.

Electricity: measuring and testing

Electromechanical switching device

Relay

324415, 340644, G01R 3102, G01R 31327

Patent

active

055460020

ABSTRACT:
In order to provide a dependable check on the reliable functioning of contacts of switches or relays which control a control device, to ascertain whether they occupy the desired rest contact position and/or have a sufficiently high mains voltage, the rest contacts of the two switches can be connected in parallel by way of a respective electrical resistor to a pole of the voltage source and both resistors can be connected in series to a charging capacitor which, upon the attainment of a given electrical charge or voltage (threshold voltage) activates the control device and in particular feeds a threshold switch or itself serves as such.

REFERENCES:
patent: 3452271 (1969-06-01), Ketter
patent: 3575607 (1971-04-01), Edstrom et al.
patent: 3699300 (1972-10-01), Buerki

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