Relay switching apparatus

Details Relay switching apparatus Relay switching apparatus

H - Electricity

02

H

348/36

H02H 3/02 (2006.01) G05B 19/042 (2006.01) H01H 9/54 (2006.01)

Patent

CA 1154138

RD-11814 RELAY SWITCHING APPARATUS Abstract of the Disclosure A switching circuit for selectively coupling a load to an A.C. power source is disclosed. The switching circuit includes a diode-commutated master relay contact and a pilot relay contact coupled in series therewith. The master and pilot relay contacts are coupled between a load and the power source in such a manner that power is applied to the load whenever both the master and pilot relay contacts are closed. A timing and control circuit performs a switching operation to open the master relay contact during a first half-cycle of the A.C. waveform of the power source during which the commutating diode is forward-biased. The pilot relay contact changes state during the next half-cycle of the A.C. waveform and the master relay contact is reclosed during the following half-cycle of the A.C. waveform.

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