Allen-Bradley 870-N40 Proximity Limit Switch Sensing Head

The Allen-Bradley 870-N40 Proximity Limit Switch Sensing Head is the external sensing element that pairs with the 870/1720 proximity limit switch body, offering a 40 mm nominal sensing distance for detecting metal targets without contact. This sensing head is designed to be mounted with the corresponding limit switch assembly to provide reliable end-of-stroke, position, or presence sensing in industrial automation. When a metal target enters its sensing field, the head generates a switching signal through the linked limit switch, enabling precise control of machinery such as conveyors, robotic lines, and automated guaging or guarding applications. Key attributes include compatibility with the 870/1720 proximity limit switch family and a compact, robust design suited for demanding factory environments. This configuration reduces mechanical wear compared with traditional mechanical limit switches while delivering repeatable, fast response essential for safe and efficient operation on production lines. Ideal for applications requiring non-contact proximity detection to verify position, stroke limits, or component presence, the 870-N40 sensing head helps streamline sequences in packaging, material handling, and general machine automation without introducing physical contact points.