IP-43 rolled steel, Meets or exceeds NEMA Premium® efficiencies, NEMA Premium models are in compliance with EISA2007 Class F Insulation System, Inverter duty 10:1 variable torque and 2:1 constant torque & 1.15 service factor on Sine Wave Power 1.0 SF on Inverter Power F1/F2 capable, Dynamically balanced rotors, Steel conduit box Dual Frame Mounting, Removable Base (bolt on/off), Double C-Face (brake/encoder kits available TEFC only), Bearing Caps for C-Face Models Modifications and Kits are available Division 2 Class 1 groups A,B,C,D this is for TEFC models, 40°C Ambient 1.15SF Sine Wave Power and 1.0SF inverter power Bearing lock tabs standard Marathon is a trademark of WEG Electric Corp., used herein under license from WEG Last Update: March 13, 2025