Siemens 3SE5214-0BC05-1AC5 Enclosure width 31 mm acc. to EN 50047. Siemens 3SE5214-0BC05-1AC5 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 1 NO/1 NC slow-action contacts with M12 plug, 5-pole pin assignment: Pin1=21, Pin2=22 Pin3=13, Pin4=14, Pin5=PE for maximum 125 V and 4 A with plunger.