Ptc Starter Specifications this Part Attaches To The Capacitor. The Start Relay Briefly Boosts The Compressor, And Then Shuts Off As Soon As The Motor Gets Up To Speed. Ptc Stands For: Positive Temperature Coefficientthis Part Works With The Following Products: This Part Works With The Following Products: Refrigerator. This Part Works With The Following Products: This Part Works With The Following Products: Frigidaire, Kenmore, Gibson, Uni. Part, 218721108 Replaces These: Part, 218721108 Replaces These: Ap2114986,781162Cross Parts: Ah428544, 218721108, 781162, Ps428544, Ap2114986, Ea428544