1. Be sure switch series matches motor type (a single phase motor is a capacitor start only, or a capacitor start/capacitor run, or if the application is for an instant reversing motor).
2. Be sure switch voltage rating matches (start) circuit voltage rating.
3. Selection can be based on actual measurement of start capacitor current or two times the motor nameplate FLA rating.
4. Switch current rating must match or exceed the motor start capacitor current requirements. Always select a SINPAC Switch with the next higher current rating for:
- High cycling applications.
- Long acceleration time.
- High ambients: Greater than 55° C.
5. To assure proper motor operation, the voltage across the start winding must reach the SINPAC Switch cut out voltage reference between 70% and 85% of motors synchronous speed.
Caution: SINPAC Switches are line voltage compensated. Changes in the line voltage will not affect system operation unless an overload condition causes reduced running speed, along with reduced voltage on the start winding.
6. Higher current switches can be used in place of lower rated switches of the same series.
View SINPAC Switch Catalog