Siemens SINAMICS S120 Manual page 120

DC Link Components
4.1 Blocksize
Protecting the resistance
The power supply to the Power Modules must be established through a contactor which can
then shut down the power supply when the resistor overheats.
A temperature protection switch handles the protective function (this is supplied with each
break resistor). This is connected in series with the coil feeder cable for the main contactor.
The contacts of the temperature protection switch close again as soon as the resistor
temperature has fallen below the selected value.
Figure 4-1
120
Connection example: Braking resistor
Manual, (GH6), 07/2007 Edition, 6SL3097-2AL00-0BP2
AC Drive