Control transformer, range: single-phase control transformers ST., basic function: single-phase control transformers STN, nominal input voltage: 400 ± 5 % V, nominal output voltage: 230 V, nominal power: 4 kVA, short-time power: 12.2 kVA, protection class: IP00, standards and regulations built and tested according to: IEC/EN 61558-2-2, VDE 0570 Part 2-2, usable according to: IEC/EN 60204-1, ÖVE-EN 13, VDE 0113, VDE 0100 Part 410