Siemens 3SE5212-0KD03 Enclosure width 31 mm acc. to EN 50047. Siemens 3SE5212-0KD03 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 slow-action contacts Roller plunger, Form C with plastic roller 10 mm.