Omron D4A0002N Limit Switch Head, Roller Lever, IP67, Mainta

The Omron D4A0002N is a limit switch head from the D4A series, fitted with a side-mounted roller lever plunger actuator. It delivers maintained action — the contacts stay switched after the actuator is released, until a deliberate opposite stroke resets them. That makes it the right call for a latching interlock or a sequence step where the switch holds state until the mechanism cycles back. Rated IP67, so the head seals against dust and temporary immersion. The NEMA enclosure rating covers 1, 2, 3, 4X, 5, 6P, 12, and 13 — meaning it's at home in washdown zones, outdoor locations, and dusty industrial bays without an extra enclosure. CSA and UL listed, so no regulatory surprise on a panel destined for North America. The steel arm is fixed at 0.57 in depth, with 75° of overtravel and 3° differential travel. Operating torque is 3.45 in-lb. That's a fairly light snap-action — suitable for sensing cam profiles or part presence where the actuator force is limited, not for heavy direct-contact stops. Temperature range spans -40 to 212 °F, so it handles both freezer-zone and hot-process proximity without derating.