3KC3 and 3KC6 transfer switching equipment3KC3 and 3KC6 transfer switching equipment
Circuit diagram for 3KC3 as transfer switching equipment
With the power supply connected externally
With the power supply connected to sources I and II (with DPS)
F1 |
1 x 3NW6003-1 1 x 3NW7013 |
10 A, gG |
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)
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.
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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).
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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.
NOTE
The F1 fuses must be installed as closely as possible to the tap.