Electrical Type: POLYPHASE HP: 1 KW: 0.75 RPM: 1745 Frame: 143JM Enclosure: Totally Enclosed Fan Cooled Phase: Three Voltage: 208-230/460 Rotation: Reversible Overload: None Material: Cast Iron Bearings Type: Ball / Ball Bearings SE Type: Ball Bearings OSE Type: Ball Mounting: Rigid Base Amperage: 3.1-2.8/1.4 Shaft Type: Keyed Shaft Extension: 4.260" Shaft Diameter: 1.156 Bearings DE Type: Ball Bearings ODE Type: Ball Meets or exceeds NEMA Premium® efficiency. Model is in compliance with EISA2007|Inverter Duty 10:1 Variable Torque and 2:1 Constant Torque|1.15 Service Factor on sinewave, 1.0 Service Factor on IGBT power