Allen-Bradley 871TM-B5C18-R3 Inductive Proximity Sensor

Allen-Bradley 871TM-B5C18-R3 is a tubular, shielded inductive proximity sensor with an 18 mm stainless-steel body and a metal face that detects metal targets at a 5 mm sensing distance. This 2-wire AC/DC device supports a broad supply range of 20–250 VAC/VDC and provides an AC normally closed output for straightforward wiring in control circuits. The sensor uses a Micro QD (AC) quick-disconnect and is designed for rugged industrial environments, delivering reliable switching with a typical 7% hysteresis. Electrical performance specs include an inrush current up to 4 A (per cycle) and leakage current up to 1.9 mA at 120 V AC, making it suitable for compact automation tasks where durable metal sensing is required. Applications include position sensing on moving metal parts, end-of-travel detection on conveyors and robotic grippers, and machine-guarding interfaces, where a compact stainless-steel sensor with non-contact operation helps maintain alignment and reduce wear.