Siemens SINAMICS S120 Manual page 109

Figure 3-11 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).
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.
In a version with one precharging resistor for each phase, a contactor of the Sirius 3RT1034
series is recommended.
Chassis power units
Manual, (GH3), 01/2013, 6SL3097-4AE00-0BP3
Basic Line
Module
Line Modules
3.2 Basic Line Modules
107