FEATURES •Meets or exceeds NEMA Premium® efficiency. Model is in compliance with EISA2007 •Inverter Duty 10:1 Variable Torque and 2:1 Constant Torque •Inverter Duty 20:1 Variable Torque •VARIABLE 20:1 •Nameplated 60/50 hertz, 190/380 volts at next lower HP •Nameplated 60/50 hertz, 190/380 volts at next lower HP •Steel frame with Class F Insulation •Standard F1, reversible to F2 assembly. Dual frame mounting holes.