Siemens SENTRON PAC3120, Manual, Page: 48 / 160

Connection
4.3 Connection examples
46
PAC3120 and PAC3220
Equipment Manual, 10/2019, L1V30425208F-01
4.3 Connection examples
The connection examples below show connection in:
● Two, three or four-wire systems
● With balanced or unbalanced load
● With/without voltage transformer
The device can be operated up to the maximum permissible voltage values with or without a
voltage measuring transformer.
It is only possible to measure the current with current transformers.
Note
Grounding of current transformers is optional.
The transformers must always be connected and therefore always grounded on the
secondary side 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.
Example connections
1. 3-phase measurement, 4 conductors, unbalanced load, without voltage transformer, with
3 current transformers
Connection type 3P4W
* The fuses are only used for cable protection.
All commercially available miniature circuit breakers up to 20 A (C) can be used.
** Connection of supply voltage
Figure 4-3 Connection type 3P4W, without voltage transformer, with three current transformers