The braking resistor STBR is ideal for the usage in drive systems with frequency inverter. During braking operation, the brake resistor converts a large amount of regenerative energy into thermal energy. Therefore a high load capacity and long life are very important. On resistance wire generated heat is quickly emitted via the extensive surface area of the high-density STBR braking resistor to the environment. The power consumption can be increased arbitrarily by variable series and parallel connection. In the selection of the brake chopper and brake resistor, there is to notice, that gearless systems feed back much more energy than systems with gear. Thus it is possible to feed back twice the energy at the same size of the drive. During the renovation of a facility it is essential to calculate the brake chopper and brake resistor design. The Sourcetronic braking resistors can be connected to the brake units STB 6014, STB 6024 and STB 6034 to achieve a higher resistance overall.