• Meets or exceeds NEMA Premium® efficiency. Model is in compliance with EISA2012 • 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