•Meets or exceeds NEMA Premium® efficiency. Model is in compliance with EISA2036 •100% cast iron construction for rigidity and reduced vibration •Meets IEEE45 USCG Marine Duty,Meets Ford EM1 Automotive Duty Specification •MAX GUARD® Class H insulation system •IP55 protection •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 •Internal and external epoxy finish