Siemens 3SE5112-0BA00 Enclosure width 40 mm acc. to EN 50041. Siemens 3SE5112-0BA00 is the exact printed commercial reference for a limit or safety switch in the SIRIUS 3SE range. Siemens' official product description is: Basic switch for position switch 3SE51 Metal enclosure, according to EN 50041 1x (M20x 1.5) 1 NO/1 NC slow-action contacts without actuator head.