Allen-Bradley 871C-A5N18-R3 Photoelectric Sensor

Allen-Bradley 871C-A5N18-R3 is a miniature inductive proximity sensor from Rockwell Automation’s 871C family, packaged in an 18 mm nickel-plated brass barrel with a nominal sensing distance of 5 mm to detect metal targets without contact. The R3 variant is normally open (NO) and AC-powered, part of the AC versions in this line that share housing and sensing characteristics with other models such as A5N18-N3 and A5N18-R3, ensuring consistent mounting and performance across versions. With a 40–250 VAC operating supply range, it suits rugged industrial environments on automation lines, conveyors, and machine assemblies where reliable metal sensing is required. The tubular form supports versatile mounting in tight spaces, and the nickel-plated brass construction contributes durability in typical manufacturing settings. Applications include position sensing on conveyors, part presence detection in assembly processes, and signaling for control circuits where metal presence initiates a response.