{"product_id":"stationary-single-speed-switch","title":"Century Stationary Single Speed Switch","description":"\u003cp\u003eThe 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.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eHow the switch works\u003c\/strong\u003e\u003c\/p\u003e\u003cp\u003eA 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.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhy it fails\u003c\/strong\u003e\u003c\/p\u003e\u003cp\u003eContacts 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.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eListed dimensions\u003c\/strong\u003e\u003c\/p\u003e\u003cp\u003e2 inch diameter by 1-1\/4 inch oval by 3-1\/8 inch high, rated at 10 mfd and 370V.\u003c\/p\u003e","brand":"Century Motors","offers":[{"title":"Default Title","offer_id":48627978698964,"sku":"AOS-601-6680","price":35.86,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0801\/9568\/2516\/files\/default_ac3b1c8d-4b60-45e3-85da-c8968d4428b2.png?v=1788732193","url":"https:\/\/www.activepoolsupply.com\/products\/stationary-single-speed-switch","provider":"Active Pool Supply","version":"1.0","type":"link"}