Allen-Bradley 871TM-B4C12-A2 Sensor

The Allen-Bradley 871TM-B4C12-A2 is a metal-face inductive proximity sensor (12 mm diameter) with a 4 mm nominal sensing distance and a normally closed AC output. It operates on 20–250 V AC/DC and is offered with a 2 m PVC cable (A2 variant) or compatible ToughLink connectors; the housing is stainless steel with a short barrel for compact mounting. A stainless steel face and short barrel define its metal-face construction, rated IP67 and NEMA 13 (with washdown-rated IP69K variants for ToughLink/micro connectors), and it includes a status indicator (red = output energized, green = power, red and green flashing = short circuit) along with ruggedization to withstand 30 G shock and 55 Hz vibration. Electrical specs include 5 mA load current, 7% typical hysteresis, ≤2 A inrush, ≤1.9 mA leakage at 120 V AC, and ≤10 V voltage drop at 5–200 mA, with operating temperature down to −25 °C.