Siemens UL 1066 Operating Instructions Manual page 163

Terminal assignment
Terminal Connection
Only for bus couplers;
TIE BRKR Allows complete ZSI functionality in systems with buscouplers so that various energy flow directions can
be taken into account.
ZSI IN ZSI modules of lower-level circuit breakers
ZSI OUT ZSI modules of higher-level circuit breakers
MV OUT Signal to the medium-voltage level
Observe the specified polarity when connecting: plus to plus and minus to minus.
The maximum wire length of the ZSI wiring is 400 m for a wire diameter of AWG 18 (2-wire conductor).
For ZSI connections between only WL circuit breakers, wire lengths of up to 1000 m are permissible if the conductor diameter is increased
to AWG 13.
The ZSI connections must consist of twisted pair cables or shielded cables.
The ZSI module allows connection of up to:
- 8 circuit breakers at the ZSI IN input and
- 20 circuit breakers at the ZSI OUT output
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