1618940C is a 3-terminal starter solenoid switch, also functioning as a relay switch for starter circuits. The 3-terminal design allows it to control starter engagement current in the same configuration as the original International units.Interchanges:International 1618940CInternational 1672574CInternational 1693479CInternational 1693479C91International 450499CWA2MR338Features3-terminal starter solenoid switchFunctions as a relay switch for starter circuitsTech Specs3-terminal configuration