Allen-Bradley 700-HG42A1-5 Auxiliary Snap Switch

Allen-Bradley 700-HG42A1-5 is a general-purpose open-style power relay (Bulletin 700) designed to switch AC mains loads in industrial control circuits. It uses a 120 V AC coil and a DPDT contact arrangement rated for 40 A, making it suitable for starting or stopping higher-current devices such as motors and heaters in manufacturing equipment. The 50/60 Hz coil operation means it is compatible with standard electrical mains supplies found in most facilities. The -5 suffix denotes an auxiliary snap switch option that provides an additional set of contacts tied to the relay’s actuation, useful for signaling, interlock, or safety-related feedback without requiring a separate device. This combination of robust electromechanical switching and integrated signaling contacts enables compact, reliable control in panels and enclosures where space and wiring complexity matter. Typical applications include control of fans, pumps, conveyors, and other AC loads in automation systems, where a single relay can both drive the load and provide a convenient status or interlock signal to a PLC or safety circuit.