The D4NL4HFAB is a safety door lock switch from Omron's D4NL series, built to guard access on machinery with a mechanical lock and key-actuated switching. It carries three normally-closed and two normally-closed contacts (3NC/2NC) — the extra NC pair gives you a dedicated feedback or status channel separate from the safety chain, which simplifies wiring for monitored guard positions. The IP67 rating means the housing and actuator withstand washdown environments, so it fits food processing or wet-area cell doors where hose-down cleaning is routine.
The AC switching current is rated at 3 A at 240 V, and the DC side handles 270 mA at 250 V. For a safety interlock, these numbers govern the load you can break — a solenoid lock or indicator lamp on the DC side stays within the 270 mA limit, while the AC contacts can switch a small contactor coil or pilot light. Dimensions are 88.5 mm wide, 95 mm tall, and 35.5 mm deep — that depth is the body depth behind the panel face, so check clearance behind the door frame or enclosure cutout before committing the BOM line. The screw terminals accept standard ferruled or solid wire; strip length and torque follow the usual Omron safety switch practice.