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    i have three power supply one of them is the main city pole and the other is two generator .and i want to connect these three power supply in three contactors to switch the electricity automatically when one of those powers supply is gone off.

    i have three power supply one of them is the main city pole and the other is two generator .

    and i want to connect these three power supply in three contactors to switch the electricity automatically when one of those powers supply is gone off.

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