Single-phase control, isolation and safety transformers with preferred voltage IEC/EN 61558-2-2/2-4/2-6 VDE 0570 part 2-2, part 2-6 (safety transformers), part 2-4 (isolation transformers ). Rated input voltage 230 ±5%V, 400 ±5%V. Rated output voltage 24 V, 230 V.