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Submersible, single phase, 3-wire motors require the use of a control box. The control box uses capacitors, relays, and in some cases contactors to start and control the submersible 3-wire motor.
SA-SPM6 control boxes are used as starting units for single-phase, 3-wire motors. The Standard Control Box incorporates a motor protective circuit breaker to protect the motor against overload. The Deluxe Control Box is similar to the Standard Control Box with the addition of a motor contactor.
Capacitor-start motors need an electrical device to disconnect the start capacitor after the motor starts. This is accomplished through the use of a potential relay. When power is applied, it is sent to both the start winding and run winding simultaneously. As the motor speed increases, the voltage across the relay coil increases until it reaches a pre-determined value; the contact then opens and disconnects the start winding, and the motor continues to run on the main winding only.
| Model | HP | Voltage & Phase | Pack | Part No. |
|---|---|---|---|---|
| SA-SPM6 Standard | 1/2 | 115V 1Ph | 10-pack | 98821580 |
| SA-SPM6 Standard | 1/2 | 230V 1Ph | 10-pack | 98821631 |
| SA-SPM6 Standard | 3/4 | 230V 1Ph | 10-pack | 98821632 |
| SA-SPM6 Standard | 1 | 230V 1Ph | 10-pack | 98821633 |
| SA-SPM6 Standard | 1-1/2 | 230V 1Ph | Single | 98315254 |
| SA-SPM6 Standard | 2 | 230V 1Ph | Single | 98315256 |
| SA-SPM6 Standard | 3 | 230V 1Ph | Single | 98315258 |
| SA-SPM6 Standard | 5 | 230V 1Ph | Single | 98315260 |
| SA-SPM6 Deluxe | 1-1/2 | 230V 1Ph | Single | 98315255 |
| SA-SPM6 Deluxe | 2 | 230V 1Ph | Single | 98315257 |
| SA-SPM6 Deluxe | 3 | 230V 1Ph | Single | 99053534 |
| SA-SPM6 Deluxe | 5 | 230V 1Ph | Single | 99053535 |
| SA-SPM6 Deluxe | 7-1/2 | 230V 1Ph | Single | 99053536 |
| SA-SPM6 Deluxe | 10 | 230V 1Ph | Single | 99053537 |
| SA-SPM6 Deluxe | 15 | 230V 1Ph | Single | 99053538 |
The 1/2, 3/4 and 1 HP boxes are supplied by Grundfos in packs of ten and are priced here per pack of ten. All other sizes are priced per single box. All models are single phase, 60 Hz.
| Specification | Value |
|---|---|
| Motor type | Grundfos 4 in single-phase, 3-wire submersible motors |
| Enclosure class | IP42 / NEMA 3R |
| Ambient temperature | -4 to +140 °F (-20 to +60 °C) |
| Relative humidity | Maximum 95% |
| Standard box | Potential relay, capacitors and motor protective circuit breaker |
| Deluxe box | Standard components plus motor contactor (magnetic starter) |
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