Siemens 3SE5112-0CD02 Industrial Limit Switch

Siemens 3SE5112-0CD02 is a SIRIUS mechanical position switch housed in a 40 mm metal enclosure per EN 50041, designed for end‑of‑travel and position sensing on industrial equipment. It uses a roller plunger with a Ø13 mm stainless steel roller and 3 mm overtravel, providing robust actuation and long life. The unit carries one normally closed and one normally open quick‑action (snap‑action) contact pair, enabling reliable signaling for interlocks or circuit monitoring. A single M20 x 1.5 connection entry provides the electrical interface, while the actuator applies about 30 N of travel force. Electrically, the switch is rated for up to 10 A at up to 400 VAC, suitable for common industrial loads. The enclosure and contacts are designed for harsh environments with protection commonly listed as IP66. This device is part of Siemens’ SIRIUS 3SE5 family and is suited for position sensing needs in automation, including end‑of‑travel signaling on conveyors, machine guards, doors, and other mechanically actuated sensing tasks where a rugged, snap‑action switch is required. If you’re replacing older 3SE devices or specifying a drop‑in alternative for a 40 mm metal‑bodied limit switch, the 3SE5112‑0CD02 provides a compatible, robust solution with a 1NC/1NO configuration and straightforward M20 entry.