Electricity: electrical systems and devices – Safety and protection of systems and devices – Motor protective condition responsive circuits
Patent
1976-06-16
1977-12-20
Miller, J D
Electricity: electrical systems and devices
Safety and protection of systems and devices
Motor protective condition responsive circuits
361 86, 361 92, 340248B, 335151, H02H 324
Patent
active
040645460
ABSTRACT:
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-energization of the winding once de-energized. A manually operable reset switch is provided in series with the self latching contacts.
REFERENCES:
patent: 2938150 (1960-05-01), Kniel
patent: 3313984 (1967-04-01), Hupp
patent: 3368129 (1968-02-01), Chausse et al.
patent: 3416035 (1968-12-01), Lipnitz
patent: 3465208 (1969-09-01), Patrickson et al.
patent: 3546531 (1970-12-01), Miner
patent: 3636541 (1972-01-01), Genuit
patent: 3870928 (1975-03-01), Allen
Miller J D
Salce Patrick R.
Societe Chimique des Charbonnages
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