Siemens 3SE5212-0LK50 Enclosure width 31 mm acc. to EN 50047. Siemens 3SE5212-0LK50 is the exact printed commercial reference for a limit or safety switch in the SIRIUS 3SE range. Siemens' official product description is: Position switch Metal enclosure 31 mm according to EN 50047 Device connection 1 x (M20 x 1.5) Rotary actuator right/left 1 NO/2 NC quick action contacts adjustable with adjustable-length Metal lever, 100 mm long and plastic roller 19 mm.