Siemens SINAMICS S120 Manual page 148

Line Modules
5.2 Basic Line Modules
Figure 5-11 Connection example, Basic Line Module, frame size GD
Precharging contactor
The precharging contactor must be able to conduct the maximum precharging current for
approx. 1 second (see the technical data) - and be able to switch ohmic-capacitive loads.
To protect against overvoltage when opening, the contactor should be equipped with a
varistor, corresponding to the manufacturer's recommendations.
The precharging contactor is controlled via terminal -X9: 5, 6 of the Basic Line Module.
For a version with one precharging resistor for each phase, a Sirius 3RT2027 is
recommended.
For a version with two precharging resistors connected in parallel for each phase, a Sirius
3RT2037 contactor is recommended.
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Air-cooled chassis power units
Equipment Manual, 06/2020, 6SL3097-5AE00-0BP3