This braking unit is an option for Altivar variable speed drives. The minimum resistance value that can be assigned is 1 Ohm. This braking unit allows Altivar 71 drives to operate during braking to a standstill or during 'generator' operation by dissipating the energy in the braking resistor. The protection class is IP20. Thermal protection is ensured by an integrated temperature sensor. It weighs 30 kg.