The RZW braking resistor series from Bosch Rexroth consists of external braking resistors for RD500 frequency converters, including standard resistor units and higher-capacity augmented versions for applications with greater regenerative braking demand.
These resistors are used to absorb braking energy during deceleration, and the converter monitors their thermal load in operation to protect the resistor from overload and shut the system down if the permissible limit is exceeded. The standard RZW01.1 range is assigned to RD500 converters up to the 110 kW power class, while the augmented RZW02.1 and RZW03.1 versions extend braking capability for larger systems up to the 400 kW class and are intended for demanding duties such as large inertia loads or long braking cycles. Across the series, the resistor designs include enclosed heavy-duty resistor elements and larger ventilated assemblies. The series also differs by enclosure and installation style, with versions including standard units, augmented IP20 models, and augmented IP23 models so the braking hardware can be matched to the required power level and mounting environment.
