1. The 3SU1900-0BA31-0AA0 is a key operated selector switch from Siemens.
2. It is a three-pole NO/NC contactor equipped with a selector switch with six positions.
3. The switch has an IP65 (IP54 optional) rated enclosure and is designed to meet EN/IEC 60947-1 standards. It has a short-circuit strength of 7500 A and a rated insulation voltage of 500 V.