Siemens SIRIUS 3RT Manual page 76

Configuration
6.3 Operating mechanism system / coil selection 3RT contactors and 3RH2 contactor relays
Connecting the supply voltage
The supply voltage for the solenoid operating mechanism must be connected to A1/A2.
Note
The slide switch on the front side of the withdrawable coil must be switched to the "ON"
position before commissioning (factory default setting is "OFF").
Connecting the 24 V DC control signal
The control signal is connected via a 2-pin plug-in connection on the front side of the
withdrawable coil (the spring-loaded connector is included in the scope of supply). The
connector is labeled with the polarity.
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SIRIUS - SIRIUS 3RT Contactors/Contactor assemblies
Manual, 09/2017, A5E03656507120A/RS-AE/006