Siemens 3SE5242-3KC05 Enclosure width 50 mm. Siemens 3SE5242-3KC05 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 according to EN 50047, 50 mm Device connection 2 x (M20 x 1.5) 1 NO/2 NC slow-action contacts LEDs 110-230 V AC, yellow/green Teflon plunger.