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Intelligent measurement systems, communication or control equipment on the high potential side of power distribution networks require power supplies with very high insulation capability and low power level. To end up with a low volume, low costs and a high efficiency of the complete system, a resonant switch mode power supply with a special transformer design was selected, designed and built up. The power supply is designed to transfer 2.5 W, guarantees a partial discharge free insulation voltage of more than 50 kV and an insulation test voltages of more than 80 kV. The power supply is based on a class-E converter to utilize the dominating parasitic elements of the high frequency transformer as resonant elements.