Siemens SIRIUS 3RT Manual page 412

Accessories
9.28 Assembly kit for contactor assemblies for star-delta (wye-delta) start (sizes S00 to S3)
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Attach the wiring module for connecting the main current paths to contactors Q11 and Q13
from above (a).
You can use the 3-phase infeed terminal (b) optionally for size S2.
Attach the neutral bridge (c) to contactor Q12 from above.
Attach the wiring module for connecting the main current paths to contactors Q13 and Q12
from below (d).
Screw the terminals tight with a screwdriver.
SIRIUS - SIRIUS 3RT Contactors/Contactor assemblies
Manual, 09/2017, A5E03656507120A/RS-AE/006