Installing and connecting an autotransformer (400 V / 230 V)

The 3KC3 transfer switching equipment requires a supply voltage of 230 V AC to supply the transfer switching equipment. The autotransformer (3KC9624–1) converts the voltage of 400 V AC that is active between the phases to the required voltage of 230 V AC.

In the case of the 3KC6 transfer switching equipment, the autotransformer can be used to connect the necessary rated voltage of 230 V AC to the main circuit connections of the 3KC6 transfer switching equipment in a three-phase 3-wire network without neutral conductor (3PH).

Installing an autotransformer

  1. Mount the autotransformer at the desired position with 4 bolts in accordance with the figure.

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    Installing an autotransformer

Connecting the autotransformer

See the table below for the requirements of the supply lines needed for the connection:

Cu

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400 VA

Ue = 400 / 230 V

Uimp = 2.5 kV

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0.5 ... 2.5 mm2

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0.5 ... 1.5 mm2

On the autotransformer, the phase on terminal L3 is transformed in each case, and output terminal NDPS is used as a neutral conductor.

Please proceed as follows to connect the autotransformer correctly:

  1. Strip the cable insulation as shown in the figure below.
    Connect the supply lines with the autotransformer in accordance with the figure.

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    Connecting the autotransformer
  2. Tighten the contacts with a screwdriver.