Omron Industrial Automation D4NL-1AFA-B Limit Switch

The Omron D4NL-1AFA-B is a rugged mechanical limit switch that provides precise end-of-travel and part‑presence sensing by delivering a discrete signal to PLCs and control logic in industrial automation. With a plunger actuator and SPDT contact configuration (1 NO + 1 NC), it supports panel or machine surface mounting and screw‑terminal termination, making it well‑suited for conveyors, packaging machines, assembly lines, and other material handling equipment. Electrical ratings vary by version but generally cover up to approximately 250 VAC or 30 V DC, with a typical industrial control current around 5–10 A, all housed in a rugged enclosure for industrial ambient temperatures. Common replacements include Omron D4NL‑1AFA‑C, Allen‑Bradley 802T‑A, and Siemens 3SE5 Limit Switch Series, reflecting its role in cross‑brand end‑of‑travel sensing and safety interlocks.