Product Description:

The RZK02.1-160-BW is a forced-air heat exchanger module produced by Bosch Rexroth Indramat within the RZK Heat Exchangers series. It is supplied as one integrated exchanger with a brake resistor, so regenerated energy from servo axes can be converted to heat and expelled from the drive enclosure. By providing controlled thermal dissipation, the unit helps protect inverter stacks and limit cabinet temperature rise in industrial automation systems with frequent deceleration.

During continuous braking, the exchanger removes up to 4 kW of heat, while its electrical path is rated for a system load of 2 kW. For 0.1-second transients, it absorbs 270 kW, allowing connected drives to redirect large regenerative peaks without overheating the resistor assembly. The internal resistor has a value of 2.2 Ω and uses Fu size class G for coordinated fuse sizing. Its thermal time constant is 13.6 s, which means the element temperature reaches 63% of its final value over that interval. Wiring terminals accept two 16 mm² brake leads plus a single 16 mm² (AWG 4) ground conductor, providing low-impedance connections between the inverter, resistor, and chassis.

Wall mounting is the intended installation style, and the housing has a protection category of IP20, so it must be installed inside an electrical cabinet. Fin surfaces can climb to 80 °C at maximum load, so the unit requires a vertical clearance of 200 mm above it and a wall spacing of 5 mm between panels to sustain airflow. Total mass is 16 kg, which supports stable mounting and helps reduce fan-related vibration. The brake lines exit fixed terminals, and the resistor must be operated with the required airflow clearance in place.