Siemens 3SE5122-0LA00-1AJ0 Enclosure width 56 mm. Siemens 3SE5122-0LA00-1AJ0 is the exact printed commercial reference for a limit or safety switch in the SIRIUS 3SE range. Siemens' official product description is: Position switch Basic switch Metal, 56 mm Increased corrosion protection 1 NO/2 NC quick action contacts functional at -40 °C Shock and vibration test according to EN 61373, Category 1B.