Century Stationary Single Speed Switch In stock$3586
Quick overview
- Stationary half of the switch This is the fixed starter switch, the part the rotating governor pushes against.
- Single speed motors Listed for single speed A.O. Smith pump motors.
- For the MSE7 pump The source lists the MSE7 pump as the application.
- Also known as SAW-25 The same switch appears under the SAW-25 designation, with 5270-64 given as a substitute part number.
- Capacitor rated Listed at a 10 mfd microfarad rating and 370V.
- Common no start cause A burnt or pitted starter switch is why a motor hums and will not come up to speed.
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Product details
The Century 629002-001 is the stationary starter switch for single speed A.O. Smith pump motors, with the MSE7 pump given as the listed application. The same part appears under the SAW-25 designation, and 5270-64 is listed as a substitute part number.
How the switch works
A single speed induction motor cannot start on its run winding alone. At rest, the starter switch contacts are closed, which puts the start winding and its capacitor into circuit and gives the rotor the kick it needs. As the motor approaches running speed, the rotating half of the assembly moves and opens these stationary contacts, dropping the start winding back out of circuit. That happens every single time the pump starts.
Why it fails
Contacts that make and break under load every start eventually pit and burn. When they stop closing reliably, the start winding never engages, and the motor hums without turning until the overload trips. Replacing the switch is the fix, and it is a good deal cheaper than a motor.
Listed dimensions
2 inch diameter by 1-1/4 inch oval by 3-1/8 inch high, rated at 10 mfd and 370V.
| Brand | Century |
|---|---|
| Manufacturer part number | 629002-001 |
| UPC | 735090907464 |
| Type | Starter switch, stationary |
| Speed | Single speed |
| Dimensions | 2 inch dia x 1-1/4 inch oval x 3-1/8 inch H |
| Fits | MSE7 pump, single speed A.O. Smith pumps |
| Capacitor microfarad rating | 10 mfd |
| Voltage | 370V |
| Substitute part numbers | 5270-64 |
| Also listed as | SAW-25 |
| Shipping weight | 0.15 lb |
| Ships | Parcel |
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