Siemens 3SE5000-0AA81 Enclosure width 31 mm acc. to EN 50047. Siemens 3SE5000-0AA81 is the exact printed commercial reference for a limit or safety switch in the SIRIUS 3SE range. Siemens' official product description is: twist lever for position switch 3SE51/52 Spring rod 200 mm, Form D Diameter 6 mm with terminal according to EN 50041.