“STERLING” Stainless Steel Grid type Resistance Boxes are usually used with slip-ring (wound rotor) Motors [AC and DC] to provide control of staring torque, staring current and speed. They are designed o meet different classes of service, in various applications where slip-ring motors are used such as conveyors, screws Feeders, Steel Rolling Mills, Rubber Mills, Cranes, Hallagues, Compressors etc.