Product Description:

The RZW03.1-045-006 is a braking resistor module produced by Bosch Rexroth Indramat within the RZW Braking Resistors series. In regenerative drive systems, this unit converts excess kinetic energy into heat during rapid deceleration or with overhauling loads. This conversion keeps the DC-bus voltage within safe operating limits and protects connected drive equipment from excessive voltage.

The resistor can absorb up to 45 kW of electrical power without exceeding its short-term thermal limits. Its nominal resistance is 7.5 Ω, which determines the current flow at a given DC voltage, while the design permits a minimum resistance of 6 Ω when devices are connected in parallel. The maximum permitted surface temperature is 80 °C, which must be considered when planning enclosure ventilation and clearances. The housing meets the IP23 ingress protection rating, guarding it against solid objects larger than 12 mm and angled water spray while allowing free airflow for cooling. The housing has a depth of 490 mm, a height of 520 mm, and a width of 395 mm. The frame uses Design 1. Power lines use 16 mm² conductors that terminate on M10 threads, providing low-impedance connections suitable for high pulse currents.

For short braking events, the resistor may conduct for 7.2 s before requiring a recovery period of 112.8 s. These periods correspond to a 6% SD operating factor and establish the permitted cyclic load. Thermal behavior is characterized by a time constant of 100 s, which means the resistor temperature changes gradually and helps prevent rapid overheating during brief power peaks. A mass of 26 kg contributes to the unit’s heat capacity while keeping its weight suitable for secure panel installation. The specified conductor size and threaded terminals provide stable electrical connections during repeated braking cycles.