Product Description:

The RZW01.1-011-NNN is a braking resistor manufactured by Bosch Rexroth Indramat for the RZW Braking Resistors series. In a drive system, it converts excess kinetic energy from decelerating motors into heat, keeping the inverter’s DC bus voltage within safe limits and preventing overvoltage trips. The device is intended for cabinet mounting in general-purpose automation lines where motion cycles include frequent stops, rapid reversals, or emergency braking events that generate short bursts of regenerative energy.

The resistor is rated for continuous thermal dissipation of 11 kW, allowing it to handle steady braking currents during normal production cycles. For rapid deceleration, it can absorb a peak load of 32 kW for up to 1 s before reaching its thermal limits. Its electrical resistance is 20 Ω; this value controls the instantaneous current drawn from the DC link and therefore affects the braking torque available to the machine. As energy is converted into heat, the aluminum housing must remain below the permitted surface temperature of 80 °C to protect nearby wiring insulation. The operating factor follows the ED design guideline, so the resistor may be used in duty cycles that alternate between energized and cooling intervals according to system sizing requirements.

Thermal equilibrium is modeled by a time constant of 185 s, indicating how long the unit takes to reach approximately 63% of its final temperature after a step change in load. With a mass of 2.3 kg, the assembly adds minimal weight to control panels but still requires a minimum top clearance of 100 mm to maintain convective airflow. Installation sites may experience relative humidity up to 90%. Permissible ambient temperatures range from 0 °C to 40 °C, while storage temperatures may range from -25 °C to 70 °C. A mounting grid dimension of 22.5 mm aligns the resistor with standard DIN rail spacing, and its Design 1 and Line 1 classification matches companion power electronics in the same product group.