Connection
4.3 Connection examples
Equipment Manual, 09/2022, L1V30415168B-03
35
4.3 Connection examples
Some connection examples for the following types of connection are listed below:
• 3P4W - 3 phases, 4 conductors
• 3P3W - 3 phases, 3 conductors
• 3P4WB - 3 phases, 4 conductors with balanced load
• 3P3WB - 3 phases, 3 conductors with balanced load
• 1P2W - 1 phase, 2 conductors
• With/without voltage transformer
• With current transformer
The device can be operated up to the maximum permissible voltage values with or without
voltage measuring transformers.
It is only possible to measure the current with current transformers.
All input or output terminals not required for measuring remain free.
The wiring method must be made notified to the device using the "powerconfig"
configuration software. The specified connection types refer to the device parameterization.
Parameterization of the devices with "powerconfig" is described in section Parameterizing the
device (Page 54).
Grounding of current transformers optional
The connection of the transformers and thus also the grounding of the transformers on the
secondary side must always be carried out according to the applicable regulations.
Grounding of the current transformers on the secondary side is not necessary for use in low-
voltage switchboards for performing measuring tasks.
Protection of the voltage measuring inputs
On the 5 A device, the fuses in the voltage measuring inputs are only used for cable
protection. Selection of the fuse depends on the supply cable dimensioning. All
commercially available fuses and automatic circuit breakers up to 16 A (C) or 20 A (B) can be
used. Observe the applicable regulations when selecting the fuse.
We recommend 5SY miniature circuit breakers, 3RV motor starter protectors, or 5SB/3NA
fuses, depending on the cable requirements and connection conditions.
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