• Meets or exceeds NEMA Premium® efficiency. Model is in compliance with EISA2036 • Meets IEEE-841 standard for severe duty applications • 100% cast iron construction for rigidity and reduced vibration • Inpro/Seal® VBX® bearing isolators on drive end shaft extension TENV and on both ends of TEFC • IP56 protection • MAX GUARD® Class H insulation system • Constant torque for inverter duty • Sintered bronze breather with brass drain & breather • Bearing caps, Precision balanced to .08”/sec • 1.15 Service Factor on sinewave, 1.0 Service Factor on IGBT power