General Data Rated input voltage 230 or 400 Vac Rated output voltage 80 ‑ 310 Vac Rated output current 0.8 ‑ 18 A Insulation class B Maximum ambient temperature 40 °C Degree of protection IP 00 Advantages Low weight and small size (compared to isolating transformers) Very high efficiency Very good moisture protection and low noise thanks to BLOCKIMPEX vacuum impregnation Contact protected screw connection terminals complying with UVV BGV A3 Simple mounting thanks to robust metal footplate with oval slots Standards Autotransformerto: VDE 0570 Teil 2‑13, DIN EN 61558‑2‑13, EN 61558‑2‑13, IEC 61558‑2‑13 Autotransformer for example for setting the speed of single-phase fan motors.