Excess energy in the DC link is dissipated in the braking resistors. The braking resistors are intended for use with SINAMICS G110D, which have an integrated brake chopper, but cannot regenerate energy to the line supply. For regenerative operation, e.g. the braking of a rotating mass with high moment of inertia, a braking resistor must be connected to convert the resulting energy into heat.

The braking resistors can be mounted above and to the side of the SINAMICS G110D distributed inverter. The heat dissipated by the braking resistor must not diminish the inverter cooling. This is the reason that a minimum clearance of 150 mm must be maintained between the inverter and braking resistor.

Every braking resistor is equipped with thermal protection. The thermal protection prevents the braking resistor from being thermally overloaded.

All of the braking resistors are provided as standard with a cable that is pre-assembled and 500 mm (19.69 in) long.