Starter Switches for Electric Motors (SINPAC®)

Single phase AC (SINPAC®) motor start switches are used in various commercial laundry, food and beverage, gas and oil, and pumps and compressor applications, including pumps, ovens, commercial washers and dryers and compressors. Stearns SINPAC® switches are ideal for applications requiring reliable switching of the start circuit in single phase motors.

Single Phase Motor Switches

Stearns supplies motor start switches capable of handling from 3-5 horsepower and are rated up to 50 amps, depending on the switch model. Choose from various configurations and ratings, including capacitor start and capacitor start and run versions:

2CV electric ignition switch for capacitor start induction motors

2CV

Motor Type: Capacitor Start
Max Motor HP: 5
Switch Rating: 35, 50 Amp
Start Circuit: 230V

View 2CV

2VR electric starter switch for capacitor run motors

2VR

Motor Type: Capacitor Start & Run
Max Motor HP: 5
Switch Rating: 35, 50 Amp
Start Circuit: 230V

View 2VR

CV switch for capacitor start induction motors

CV

Motor Type: Capacitor Start
Max Motor HP: 3
Switch Rating: 16, 25, 40, 50 Amp
Start Circuit: 115V

View CV

IR solid state starter switch for instant reverse motor

IR

Motor Type: Capacitor Start
Max Motor HP: 2
Switch Rating: 25, 40 Amp
Start Circuit: 115V

View IR

IVR solid state switch for capacitor start capacitor run motors and instant reversing

IVR

Motor Type: Capacitor Start & Run
Max Motor HP: 3
Switch Rating: 25, 40 Amp
Start Circuit: 115V

View IVR

VR solid state electronic motor start switch for capacitor run motors in high-cycling, dirty or challenging environments

VR

Motor Type: Capacitor Start & Run
Max Motor HP: 3
Switch Rating: 16, 25, 40, 50 Amp
Start Circuit: 115V

View VR

Use Cases for Stearns SINPAC® Electronic Motor Start Switches

SINPAC® switches are ideal for applications requiring consistent switching of the start circuit in single phase motors. Since standard mechanical switches are prone to design quality deficiencies including fatigue, contamination, corrosion and vibration that can lead to performance inconsistencies, Stearns line of SINPAC® switches reduce production downtime for hundreds of different applications.

Benefits of Electric Motor Start Switches

Manufactured to cut out the start circuit at approximately 80% of synchronous speed, SINPAC® switches from Stearns are designed to filter out electrical noise (silent), are cadmium free and non-sparking which increases the life of a motor. Additional advantages include:

Efficient: Switches will operate in areas susceptible to brown-outs or low voltage
Dynamic: Can be used on new or existing motors
Sustainable: No wearing parts means long life
Versatile: Switches will work on any manufacturer single-phase motors, reducing the selection time & switch inventory
Durable: Will not limit motor performance due to moisture, dust, shock, vibration or over speed

SINPAC® Switch Installation & Testing

View our how-to SINPAC® switch installation video below or explore our SINPAC® catalog for complete wiring diagrams, testing parameters and troubleshooting tips. You can also contact our technical support team with any SINPAC® switch questions you may have.

Find a Stearns SINPAC® Electronic Start Switch by Industry:

Agriculture | Food & Beverage | Pumps & Compressors | Gas & Oil | Commercial Laundry