Power failure warning system

Details Power failure warning system Power failure warning system

1975-03-24

1976-05-18

Caldwell, John W.

Communications: electrical

Systems

Call station

340248B, 340252P, G08B 2100

Patent

active

039582124

ABSTRACT:
An electrical relay has an energizing winding and electrical relay contacts controlled in position by the winding. An energizing circuit electrically connects the energizing winding of the relay to one of the conductors of the power system at one of the conductors of an electrical appliance and to the other conductor of the appliance for maintaining the winding energized during operation of the power system and the appliance. A warning circuit electrically connects a source of electrical energy, a warning device and the relay contacts in circuit in a manner whereby when the power system is operating, the winding is energized, the contacts are separated and the warning device is inoperative. When the power system fails, the appliance is inoperative, the winding is deenergized, the contacts are moved into electrical contact and the warning device is operated by the source of electrical energy.

REFERENCES:
patent: 2112137 (1938-03-01), Brach
patent: 2731629 (1956-01-01), Siderman
patent: 3533094 (1970-10-01), Brelje
patent: 3859646 (1975-01-01), Schwellenbach

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