A three-speed circulator pump that fits requirements

The UPS is a three-speed circulator pump designed for circulation of liquids in heating and air-conditioning systems. Used in both open and closed systems and of the canned rotor type, the pump and motor form an integral unit without a shaft seal and with only two gaskets for sealing. The bearings are lubricated by the pumped liquid. UPS circulator pumps are also available with bronze or stainless steel housings, making them suitable for use in hot-water service systems.

The pump incorporates a thermal overload switch in the stator. If the winding temperature becomes too high, the switch will interrupt the electricity supply either via an internal relay or an external contactor.