Siemens 3SE5212-0LK60 Enclosure width 31 mm acc. to EN 50047. Siemens 3SE5212-0LK60 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 according to EN 50047, 31 mm Device connection 1 x M20 x 1.5 1 NO/2 NC quick action contacts adjustable-length twist lever with positive fit (grid hole) right/left adjustable with plastic roller 19 mm.