3KC3 and 3KC6 transfer switching equipment3KC3 and 3KC6 transfer switching equipment
Network types
The transfer switching equipment can be connected to different types of network.
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Three-phase 4-wire network with 3 phases and neutral conductor (3PH + N)
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Three-phase 3-wire network with 3 phases and no neutral conductor (3PH)
It is possible to use the transfer switching equipment for switching between any two networks in accordance with the standard IEC 60947-6-1.
It is also possible to use 3KC3 transfer switching equipment as a load transfer switch for switching between two loads in accordance with the standard IEC 60947-3.
NOTICE
The product is designed for a rated impulse withstand voltage Uimp of 6 kV for the main circuit. The control circuit of the 3KC3 transfer switching equipment is designed for 4 kV and the control circuit of the 3KC6 transfer switching equipment is designed for 2.5 kV.
The dual power supply (DPS) accessory is designed for a rated impulse withstand voltage Uimp of 4 kV, and the autotransformer accessory is designed for 2.5 kV.
If the auxiliary conductor terminal accessory is used with the transfer switching equipment installed on a grounded base plate, the rated impulse withstand voltage Uimp of the transfer switching equipment is reduced to 2.5 kV!
When using the product in an application in which overvoltages of > 4 kV or > 2.5 kV can occur, suitable measures must additionally be taken to limit these overvoltages to no more than 4 kV or 2.5 kV, respectively.
NOTE
The transfer switching equipment must be connected with phase equality.
The following applies to the circuit diagrams below: The following terminal with accessories can be used to connect a line to both power supply inputs:
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1 x 8WH2003-0AG00
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1 x 8WH9003-1GA00
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2 x 8WH9150-0CA00
NOTE
3KC3 transfer switching equipment is suitable for any type of network up to a maximum 4-wire network when the power supply is connected externally. It is therefore also suitable for a single-phase network with 1 phase and a neutral conductor.