A.O.Smith Motor Catalog - Universal Electric Motors

Continued from previous pageCentury® Industrial • Multi-Speed • Three Phase MotorsTotally Enclosed Fan-Cooled (TEFC) - Rigid Base - Two SpeedVariable Torque - 1/.25 thru 50/12.5 HPFeatures:• Ball Bearings • 60 Hz • 40˚C Ambient • Class B or F Insulation • Service Factor 1.15M681Applications:For two-speed, one and two winding, variable torque applications for speed control from one speed to another while under load.Blowers, fans, conveyeors, mixing machines, centrifugal pumps.Oper. HP Oper. HP Full Load Stock Cast Insulation “C” High Spd. Low Spd.HP Volts High Spd.* Low Spd.* Amps Frame Number Iron Class Dim. Efficiency Efficiency NotesTwo Speed 1800/900 RPM • Two Winding • Variable Torque1.5~.37 460 1-1⁄2 .19 2.1/.95 145T M145 B 13.7 1,4915~3.7 460 15 1.87 19.5/7.5 256T M445 √ F 24.8 88.0 75.0 1,1150~12.5 460 50 6.25 59.0/19.0 364T M681 √ F 33.3 92.4 89.5 1Notes:1. Item to be discontinued when stock is depleted11. C & D flange kit available49. 1.0 Service Factor*The operating horsepower is based on the type load wherethe horsepower required varies as the cube of the speed.Examples of such loads are fan or blower systems andcentrifugal pumps. Two-speed motor performance data sheetsare available from your A. O. Smith Customer Service Center.www.aosmithmotors.com193