Protection circuits

Details Protection circuits Protection circuits

H - Electricity

02

H

348/39

H02H 3/24 (2006.01) G01R 19/165 (2006.01) H02H 3/027 (2006.01) H02H 3/13 (2006.01)

Patent

CA 1080842

PROTECTION CIRCUITS ABSTRACT OF THE DISCLOSURE A protection circuit is provided which incorporates a reed relay whose contacts form the circuit breaker of an electrical appliance. The winding of the reed relay is supplied with a rectified alternating current derived from a current transformer coupled to the supply line to the appliance. In order to avoid periods of zero current in the winding, the winding is also supplied with a rectified alternating current from a source which is out of phase with that supplying the supply line. Failure of the current on the line will cause the contacts to open. Preferably the relay has a set of self latching contacts to prevent re- energisation of the winding once de-energised. A manually operable reset switch is provided in series with the self latching contacts. - 1 -

255396

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