... • Multilingual touch screen monitoring and control interface • Suitable for harsh grid environment • Auxiliary heater (optional) • Max. working altitude at 6000m ... 6-1, EN61000-6-2, EN61000-6-3, EN61000-6-4,EN61000-3-2, EN61000-3-3, EN60164-1-1,EN55022, EN50178, TÜ ... Voltage Range 310~450VacRated Grid Frequency50Hz/60HzGrid Frequency Range47~51.5Hz/57~61.5HzOutput Current THD<3% (at nominal power)DC ...