AC Electrical device protective thermal relay

Details AC Electrical device protective thermal relay AC Electrical device protective thermal relay

1982-07-21

1983-10-25

Salce, Patrick R.

Electricity: electrical systems and devices

Safety and protection of systems and devices

Motor protective condition responsive circuits

361 32, 361106, 361 76, 361 77, 318783, H02H 7085, H02H 7097

Patent

active

044122667

ABSTRACT:
A protective thermal relay comprises a main heater for heating a snap-action element of a bimetallic switch to open the switch. The main heater is connected in series with the motor or other device to be protected by the relay. There is also an auxiliary heater for the bimetal element that is energized through an abnormal condition detection relay, e.g., a negative phase sequence detector, when the abnormal condition occurs. The auxiliary heater is a positive temperature coefficient type and will heat and hold the switch in the motor off mode as long as the negative phase sequence or other abnormal situation remains.

REFERENCES:
patent: 2324161 (1943-07-01), Holmes
patent: 2463935 (1949-03-01), Fish et al.
patent: 2768342 (1956-10-01), Vaughan et al.
patent: 2774929 (1956-12-01), Schaefer
patent: 3110844 (1963-11-01), Brandt, Jr.
patent: 3188522 (1965-06-01), Culbertson
patent: 3482146 (1969-12-01), McMorrow et al.
patent: 3840834 (1974-10-01), Obenhaus et al.
patent: 4042860 (1977-08-01), Woods et al.

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