Basic Operation

Capacitor start motor require a method to extract speed data from the voltage across the motor start winding. By comparing the start winding RPM-sensitive voltage with the main AC input voltage (which serves as a reference voltage), the switch determines when the start circuit should be energized. The electronic switch interrupts the start circuit current after the motor has accelerated to the cut out speed, and reconnects the start circuit whenever the motor speed has fallen to cut in speed (usually about 50 % of synchronous motor speed).
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Item #

Typical Maximum Motor

Typical
Full Load Motor
Current Rating (115 Volts)

Typical
Full Load Motor
Current Rating (115/230 Volts)

Switch Rating
Permissible Max
Start Winding Current

Typical Cut Out Voltage

List Price

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N/A 1/2 hp N/A 8 A N/A 8/4 A N/A 16 A N/A 130 V $0.00
N/A 1 hp N/A 12 A N/A 12/6 A N/A 25 A N/A 130 V $0.00
N/A 2 hp N/A 20 A N/A 20/10 A N/A 40 A N/A 130 V $127.68
N/A 3 hp N/A 25 A N/A 25/12.5 A N/A 50 A N/A 130 V $0.00
N/A 1/2 hp N/A 8 A N/A 8/4 A N/A 16 A N/A 147 V $0.00
N/A 1 hp N/A 12 A N/A 12/6 A N/A 25 A N/A 147 V $0.00
N/A 2 hp N/A 20 A N/A 20/10 A N/A 40 A N/A 147 V $127.68
N/A 3 hp N/A 25 A N/A 25/12.5 A N/A 50 A N/A 147 V $0.00
N/A 1/2 hp N/A 8 A N/A 8/4 A N/A 16 A N/A 165 V $0.00
N/A 1 hp N/A 12 A N/A 12/6 A N/A 25 A N/A 165 V $0.00
N/A 2 hp N/A 20 A N/A 20/10 A N/A 40 A N/A 165 V $0.00
N/A 3 hp N/A 25 A N/A 25/12.5 A N/A 50 A N/A 165 V $145.30
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