Circuit diagram for 3KC3 as transfer switching equipment

With the power supply connected externally

98603623819_Thumbnail.png
Three-phase 4-wire network with neutral conductor for the 3KC3 transfer switching equipment

With the power supply connected to sources I and II (with DPS)

98603948171_Thumbnail.png
Three-phase 4-wire network with neutral conductor for the 3KC3 transfer switching equipment

F1

1 x 3NW6003-1

1 x 3NW7013

10 A, gG

NOTE

The F1 fuses must be installed as closely as possible to the tap.

The dual power supply accessory 3KC9625-1 is required for the power supply of the transfer switching equipment. You can find a detailed description in the section titled Mounting and connecting the dual power supply (DPS).

With the power supply connected to sources I and II (without DPS)

98603952779_Thumbnail.png
Three-phase 4-wire network with neutral conductor for the 3KC3 transfer switching equipment

F1

1 x 3NW6003-1

1 x 3NW7013

10 A, gG

NOTE

The F1 fuses must be installed as closely as possible to the tap.

It is also possible to connect the sources without dual power supply (DPS) for the power supply of the transfer switching equipment. However, if one of the sources is not available, switching is only ever possible in one direction, namely in the direction of the available source.

  • If only source I is available, the transfer switching equipment can only be switched in the direction of position I (II -> 0 and 0 -> I).

  • If only source II is available, the transfer switching equipment can only be switched in the direction of position II (I -> 0 and 0 -> II).

This would make it impossible to reach the OFF position using the control unit if one source fails. Use of the dual power system (DPS) accessory therefore offers complete reliability, as it makes it possible to switch to all three positions when either source I or source II is available and is recommended for this reason.

98603623819.png

1)

If auxiliary conductor terminal 3KC9622‑2 is used with the transfer switching equipment installed on a grounded base plate, Uimp is reduced to 2.5 kV.

98603948171.png

1)

If auxiliary conductor tap 3KC9622‑2 is used with the transfer switching equipment installed on a grounded base plate, Uimp is reduced to 2.5 kV.

98603952779.png