Motor protection apparatus using fusible links

Details Motor protection apparatus using fusible links Motor protection apparatus using fusible links

1974-11-29

1976-06-01

Wayner, William E.

Refrigeration

Automatic control

Refrigeration producer

317 40R, 219210, H02H 504, F25B 4900

Patent

active

039599841

ABSTRACT:
The disclosure describes improved apparatus for protecting the motor of a refrigerant compressor. The apparatus includes fusible links and a magnetic contactor connected in series between a source of three-phase AC voltage and the compressor motor. If the contactor fails in the closed position, a relay energizes resistors which heat the links. In response to the heat, the links are switched to an open circuit condition that disconnects the compressor from the source of AC voltage.

REFERENCES:
patent: 2470257 (1949-05-01), Moore
patent: 3038056 (1962-06-01), Wolfskill
patent: 3414704 (1968-12-01), Flanagan
patent: 3656023 (1972-04-01), Hadfield
patent: 3766437 (1973-10-01), Fritts
patent: 3852648 (1974-12-01), Barry et al.

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