Variable Speed Drives for Pumps, Fans
These AC drives adjust motor speed to the required flow of air or fluids, reducing energy costs by 50 percent. Both the Alivar 212 and S-Flex feature electronic motor controls that reduce  mechanical stress. Embedded reduced harmonic technology reduces wire size and the size of upstream overcurrent protection devices. Lightweight S-Flex model has a smaller enclosure size and features fewer points of electrical failure.
Schneider Electric 
http://products.schneider-electric.us
800.435.2121
