Siemens SIRIUS 3RT Manual page 420

Accessories
9.28 Assembly kit for contactor assemblies for star-delta (wye-delta) start (sizes S00 to S3)
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To connect the control current paths, push the conductors into the contactor terminals.
To connect the coil contacts, push the conductors into the contactor terminals.
Screw the terminals tight with a screwdriver.
SIRIUS - SIRIUS 3RT Contactors/Contactor assemblies
Manual, 09/2017, A5E03656507120A/RS-AE/006