Siemens 3SE5134-0BA00-1AC4 Enclosure width 40 mm acc. to EN 50041. Siemens 3SE5134-0BA00-1AC4 is the exact printed commercial reference for a limit or safety switch in the SIRIUS 3SE range. Siemens' official product description is: position switch plastic enclosure 40 mm according to EN 50041 1 NO/1 NC slow-action contacts with M12 plug, 4-pole pin assignment: Pin1=21, Pin2=22 Pin3=13, Pin4=14 max. 250 V and 4 A.