Siemens 3SE5242-1LC05 Enclosure width 50 mm. Siemens 3SE5242-1LC05 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, 50 mm according to EN 50047 Device connection 2 x (M20 x 1.5) 1 NO/2 NC quick action contacts LED, yellow/green, 24 V DC Teflon plunger.