Typ: RU-2 Single-phase toroidal variable transformer according to DIN VDE 0552, designed as autotransformer (auto-connected winding), with rotary switch and scale. Voltage adjustable between zero and max. value. Angle of rotation across the entire setting range approx. 330°. Terminal connection, prepared for safety class I, 50/60 Hz, ta 40°C. voltage and output power range: UPRI: 230 V USEC: 0 - 260 V