... .63~10MVA S9~S13 transformer Constant Voltage TransformerService conditions 1) Altitude: ≤1, 000m 2) Maximal ambient temperature: +40.C3) Maximal daily average temperature ... , maintenance free S9-M-630~10000/10 Electric Power Distribution TransformerPrimary voltage: 6, 6.3, 10, 10.5, 11,35kV,Tapping range: ±5 ...