Siemens 3SE5122-0CR01 Enclosure width 56 mm. Siemens 3SE5122-0CR01 is the exact printed commercial reference for a limit or safety switch in the SIRIUS 3SE range. Siemens' official product description is: Position switch Metal enclosure 56 mm wide, Device connection 3x (M20x 1.5), 1 NO/1 NC quick action contacts, Spring rod actuator, 142.5 mm total length, plunger plastic.