Electrical Type: POLYPHASE HP: 1 RPM: 1160 Frame: 145T Enclosure: Open Drip Proof Phase: Three Voltage: 208-230/460 Rotation: Reversible Overload: None Material: Rolled Steel Mounting: Rigid Base Amperage: 1.55 Shaft Type: Keyed KW: 0.75 Shaft Diameter: 0.875 Bearings DE Type: Ball Bearings ODE Type: Ball Shaft Extension: 2.250" 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|Standard assembly F1, reversible to F2 assembly|Dual frame mounting holes