Allen-Bradley 871C-K4B12 Photoelectric Sensor

Allen-Bradley 871C-K4B12 Photoelectric Sensor is a tubular photoelectric switch from Rockwell Automation's 871C family, engineered for non-contact presence detection in manufacturing and packaging lines. This class of sensors operates by emitting light and generating an electrical output when a target interrupts or reflects the beam, enabling fast, reliable triggering of controllers, conveyors, and downstream equipment without physical contact. The 871C family is offered in multiple diameters to suit different mounting styles and space constraints, including 12 mm, 18 mm, and 30 mm variants, with a range of housing configurations to fit compact installations. Model 871C-K4B12 designates a specific variant within the 871C lineup; for exact electrical interface details, sensing distance, and response characteristics, refer to Rockwell Automation’s official documentation or a verified distributor datasheet for this model. Typical applications include detecting parts on conveyors, feed systems, and packaging checkpoints, helping automate control logic and reduce downtime by providing reliable presence sensing in industrial environments.