Allen-Bradley 872C-A5C18-A2 Inductive Proximity Switch

The Allen-Bradley 872C-A5C18-A2 Inductive Proximity Switch is a general-purpose, non-contact metal detection sensor in the Bulletin 872C WorldProx family, designed for industrial automation and machine control with an inductive sensing principle. It features an 18 mm threaded nickel-plated brass housing with a plastic face, a shielded sensing distance of 5 mm, and a normally closed 2-wire AC output rated for 20–250 VAC via a 2 m PVC cable. This device detects ferrous and non-ferrous metal objects without contact, making it suitable for conveyors, robotic work cells, packaging lines, metal fabrication equipment, and automotive manufacturing, with IP67 protection and compatible NEMA ratings (1, 2, 3, 4, 6P, 12, 13) for rugged industrial use; it switches at up to 15 Hz with a load current under 300 mA and provides a red LED status indicator. Common replacements include Allen-Bradley 872C-A5N18-A2, 872C-A5C18-R3, and 872C-A5P18-A2. It belongs to the Bulletin 872C WorldProx line, with a 2-wire AC wiring configuration and a shielded 5 mm sensing distance, ensuring reliable closed-state switching across its 20–250 VAC range.