Vital relay operating circuit

Details Vital relay operating circuit Vital relay operating circuit

H - Electricity

01

H

348/39

H01H 47/22 (2006.01) B61L 1/18 (2006.01) H01H 47/00 (2006.01)

Patent

CA 1053791

Vital Relay Operating Circuit Abstract of the Disclosure There is disclosed a means for energizing a vital relay in response to an input signal that is modulated be- tween two frequencies. A discriminator circuit responds to the modulated frequencies and produces an output of alter- nating polarity. Coupled between the discriminator and the vital relay is a relay driver which responds to the output of the discriminator and energizes the vital relay. A d.c. power supply is coupled to the relay driver. The vital relay in- cludes two windings. Failure of the modulation, the d.c. source or virtually any circuit element, will result in re- lease of the vital relay. The disclosed embodiment uses photo- resistors as switching elements.

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