Shop Brook Crompton BC4M040-4D and trust MRO to be your reliable Brook Crompton supplier to experience the difference that quality and expertise can make. Trusted since 1898. Fast, Free Shipping. NEMA MG1-PART 31 Inverter Duty 15:1 Constant Torque Severe Duty Service Factor 1.25 IP55 degree of protection VPI Impregnation Internal Tropicproof F1, F2, & F3 convertible Class F insulation Dual Rated 60/50Hz Split conduit box is 90 degree rotatable Warranty: 3 Years CSA approved for Class I ; Division 2 ; Groups A, B, C & D, T3