Product Description:

The RZK01.1-160-NN/S101 liquid-to-air heat exchanger is produced by Bosch Rexroth Indramat and belongs to the RZK Heat Exchangers series. It is paired with drive-mounted brake resistors to remove excess thermal energy that appears during rapid motor deceleration in industrial automation systems. By transferring heat away from the cabinet, the unit protects power electronics and helps maintain drive reliability when braking cycles are frequent. This arrangement is useful in drive systems that must absorb repeated regenerated energy without allowing cabinet temperatures to rise too quickly.

The exchanger supplies a continuous cooling capacity of 4 kW, meaning it can remove heat under steady-state loading from the connected braking circuit. Its integrated brake resistor presents 2.2 Ω of resistance, providing a predictable load for regenerated power that cannot be returned to the mains. A housing classified to IP20 prevents accidental contact with live parts but offers no fluid sealing, so the assembly is installed in a dry location outside the control cabinet. During normal duty, the resistor dissipates a nominal thermal load of 2 kW, and the metal mass reaches equilibrium after a thermal time constant of 13.6 s, showing that the surface temperature responds quickly to changing load conditions. This behavior helps the unit handle recurring braking events without depending only on passive heat storage.

For short braking bursts, the device tolerates a peak power of 270 kW for 0.1 seconds, allowing the drive system to absorb high-energy stops without exceeding component limits. The external finned surface must stay below 80 °C to help prevent damage to nearby wiring and painted surfaces. The assembly weighs 16 kg, which keeps handling manageable during mounting and service work. Mounting is perpendicular to the cabinet wall and requires a top clearance of 200 mm so ambient air can rise through the fins without obstruction. The liquid circuit carries heat through the internal channels, while airflow over the fins releases that heat to the surrounding air.