Square D 8502SCO2S is a reversing magnetic starter used in industrial and commercial electrical systems to start, stop, and reverse three-phase motors. It combines contactor elements and overload protection in a single assembly, allowing forward and reverse motor operation through control logic. The starter operates with a control voltage, such as 120 VAC, to energize its coils and close the power contacts supplying the motor. It includes overload relay protection to help prevent motor damage from sustained overcurrent conditions. Reversing starters like this are commonly used in conveyors, pumps, compressors, and other machinery requiring bidirectional motor control.