Siemens 3SE5000-0AA53 Enclosure width 31 mm acc. to EN 50047. Siemens 3SE5000-0AA53 is the exact printed commercial reference for a limit or safety switch in the SIRIUS 3SE range. Siemens' official product description is: Adjustable-length Twist lever for position switch 3SE51/52 Stainless steel lever 100 mm long with stainless steel terminal Stainless steel roller 19 mm.