Siemens 3SE5112-1KA00 Enclosure width 40 mm acc. to EN 50041. Siemens 3SE5112-1KA00 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 40 mm according to EN 50041 device connection 1x (M20 x 1.5) with 2 LEDs, yellow/green 24 V DC 1 NO/2 NC slow-action contacts without actuator head.