SD100 IEEE841 severe duty/IEEE 841 TEFC motors are available in two configurations which exceed NEMA Premium® efficiency with our exclusive, leading-edge, die cast copper rotor design (143T to 256T) or meet NEMA Premium® efficiency with our die cast aluminum rotor design (143T to S449). They also exceed IEEE Standard 841TM to 2009 standards for high performance, rugged construction and long service life, for the most demanding industrial applications. They are ideal for use in chemical processing, mining, foundry, pulp and paper, waste management and petro/chemical applications. Siemens AC Motor, 2-Pole Continuous-Duty Low Voltage Standard Type SD100 IEEE841, Series: 1LE2, Severe Duty Motors, Squirrel Cage Motors Special Features, 20 HP, 460 VAC, 22.5 A, 60 Hz Frequency, 3 ph ph, 3600 RPM Speed, TEFC/IP54/IP55 Enclosure, 256TC Frame, 1.625 in Dia x 3.55 in L Shaft, Bi-Directional Rotation, 1.15 Service Factor, Ball Bearing, 30 lb-ft Torque, C-Face/Footless/Floor Mounting, -20 to 40 °C, Insulation Class: Class F, Cast Iron, 4:1 Constant Torque Speed, 20:1 Variable Torque Speed, 24.9 in W x 12.33 in H Dimensions