Allen-Bradley 871P-DV20BP40-D4 Inductive Proximity Sensor

The Allen-Bradley 871P-DV20BP40-D4 Inductive Proximity Sensor is a rugged rectangular sensor designed for non-contact detection of metallic objects in industrial automation. It features a 20 mm sensing distance, four-wire DC output (PNP, NO + NC), a 10–30 V DC supply, and a micro quick-disconnect (M12) connection in a rectangular 40 mm head with non-flush mounting. Its IP68 rating, weld-field immune construction, and industrial-grade coating support reliable operation in harsh environments from -25°C to +70°C, making it suitable for welding equipment, conveyors, and automated production lines. Common replacements include the Allen-Bradley 871P-D20BP40-D4 Proximity Sensor and the 872C-D3NP8-E2 Proximity Sensor.