Rapid turn-on, slow drop-out control arrangement

Details Rapid turn-on, slow drop-out control arrangement Rapid turn-on, slow drop-out control arrangement

1986-12-22

1988-02-09

Hix, L. T.

Electricity: electrical systems and devices

Control circuits for electromagnetic devices

For relays or solenoids

361194, 361195, H01H 4726, H01H 900, H01H 5012

Patent

active

047245042

ABSTRACT:
An electrical equipment controller is provided with a delayed turn-off capability. A thermostat is in series with a control relay. The thermostat is further in parallel with the series combination of a relay latch contact and a first positive temperature coefficient (PTC) device. A second PTC device is connected in parallel with the control relay. The arrangement of first and second PTC devices provides a predeterminable drop-out relay including compensation for ambient temperature changes.

REFERENCES:
patent: 2885604 (1959-05-01), Stavrinaki
patent: 2932774 (1960-04-01), Rice
patent: 4189091 (1980-02-01), Ballard et al.
patent: 4320309 (1982-03-01), Griffiths et al.

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