Input at B1, B2, B3 & C, output at E1, E2,E3 & C Input Volt: 415V Output volt: 0-470V continuously variable, output current: 400 Amps Thermal rating: 400 Amps @270V continuous Type of cooling: ONAN Operating temperature: 0-45 degree C. Insulation level: 2.5 kV rms for one minute. Voltage control: motorized with 20 KG AC synchronous motor (220V AC, 50 Hz, 60 rpm) Output voltage is in unbalanced but less than 0.5% difference in each phase. Transformer : Copper wound Cooling: oil Cooled with radiators. (Oil grade IS 335) Mounting: with Caster wheels. Connection configuration: STAR. Approx.. size of the tank: 1200(H) x 1300 x 670 mm Radiators : 900 x 300 x 5 sections x 6 numbers