Indoor Voltage Transformer, Highest voltage for equipment, 17.5 – 24 (25) kV, Power frequency test voltage, 1 min. 38 - 50 kV, Lightning impulse test voltage, 95 - 125 kV, Fuses, 0.5 - 6.3 A (IEC), Max. rated burden, classes, 50/0.2 - 150/0.5 - 200/1 VA/cl, Residual winding, 50 - 200/6P VA/cl