40 hp, TEFC Enclosure, No Thermal Protection, 1,780 RPM, 575 Volt, 60 Hz, Three Phase Premium Efficient Motor US Motors 40 hp, TEFC Enclosure, No Thermal Protection, 1,780 RPM, 575 Volt, 60 Hz, Three Phase Premium Efficient Motor - Size 326 Frame, Rigid Mount, 2 Speed, Ball Bearings, 37 Full Load Amps, F Class Insulation, Reversible