Allen-Bradley 74A16 Electromechanical Relay Module

The Allen-Bradley 74A16 is a size-4 electromechanical relay coil rated for 550 VAC, designed to energize compatible Allen-Bradley contactors in industrial control circuits. Listed as 550V-60CY, it specifies operation on a 550-volt AC supply at 60 hertz, a common standard for many North American industrial facilities. In practice, energizing the coil magnetizes the relay armature, pulling in the contactor's main contacts to switch high-current loads such as motors, conveyors, and pumps, while providing galvanic isolation between the control circuitry and the power circuit. As part of the 74A coil family, this size-4 coil is used with matching Allen-Bradley contactors appropriate for the 74A16 coil, and is typically stocked as a replacement component in maintenance and panel-building environments.