Product Description:

The RZK01.1-160-BW/S115 is a resistive brake and heat exchanger assembly produced by Bosch Rexroth Indramat within the RZK Heat Exchangers series. In multi-axis drive cabinets, it converts surplus kinetic energy into heat and releases that energy to ambient air, protecting servo inverters from overvoltage during fast deceleration or emergency stops. By combining a calibrated resistor network with forced-air cooling, the unit maintains predictable braking performance while simplifying thermal management for automation lines. The unit is typically mounted next to Indramat supply modules, where regenerated energy is handled locally instead of being sent to external dump resistors. This arrangement is useful in systems where several axes can return energy to the DC bus during the same stopping cycle.

The braking path uses a resistance of 2.2 Ω, a value chosen to limit discharge current without exceeding component temperature limits. Heat generated in the resistor is removed by the integral exchanger that delivers 4 kW of continuous cooling power, allowing the assembly to operate at its nominal brake power. Connection to the supply module is made through a busbar with a cross-section of 2 × 16 mm², while protective grounding uses a separate conductor sized at 1 × 16 mm². The thermal mass and airflow path produce a thermal time constant of 13.6 s, which shows how quickly the housing temperature responds after a load change. This combination supports stable energy dissipation during repeated braking events in automated production equipment.

Short bursts are handled by a peak brake power capability of 270 kW that can be applied for 0.1 s before the resistor exceeds safe limits. During such transients, the aluminum enclosure may approach, but must not exceed, the maximum housing temperature of 80 °C. Cabinet installation requires at least 200 mm of clearance above the top edge so that airflow is not impeded, and the overall weight of 16 kg supports straightforward panel mounting. With an enclosure rating of IP20, the device is intended for protected indoor panels where accidental contact with live parts is controlled. The open enclosure format makes it suitable for installation inside cabinets rather than exposed machine locations.