477105012U03 Stearns SINPAC Electronic SwitchVR Series for 115 Vac or 115 230 Vac Dual Voltage Capacitor Start Capacitor Run Motors Basic Operation Capacitor start capacitor run motors provide continuous voltage sensing information which can be used to extract speed data from the voltage across the motor start winding. By comparing this start winding RPM sensitive voltage to the main AC input voltage (which serves as a reference voltage), the switch determines when the start circuit should be de