RZW02.1-090-040 Bosch Rexroth Indramat
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The Bosch Rexroth Indramat RZW02.1-090-040 is a braking resistor with a rated power of 90 kW and a resistance of 3.7 ohms. Part of the RZW Braking Resistors series, it has an IP20 protection class, weighs 93 kg, and measures 995 mm wide by 710 mm high by 490 mm deep. The unit supports a power cable size of 70 mm² and features a maximum on time of 48 seconds with a load cycle of 120 seconds.
Internal Product Review
The RZW02.1-090-040 is a Bosch Rexroth Indramat RZW braking resistor rated for 90 kW with 3.7 Ω resistance. IP20 protection and a 40% operating factor make the design especially well suited for controlled cabinet installations with repeated braking demand. A 120 s load cycle highlights solid thermal capability for demanding drive applications.
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Product Description:
The RZW02.1-090-040 braking resistor assembly is produced by Bosch Rexroth Indramat for the RZW Braking Resistors series. In regenerative drive systems, it diverts surplus DC-bus energy into heat and helps prevent overvoltage during rapid motor deceleration. The component is intended for cabinet mounting in automated production machinery that requires controlled braking torque and reliable heat dissipation. Its energy-absorption function supports servo and inverter applications in which motors frequently return power to the DC bus.
The resistor has a continuous dissipation capacity of 90 kW, allowing high-power axes to brake repeatedly without exceeding the applicable bus limits. Its resistance of 3.7 Ω determines the current drawn from the DC link and must match the regenerative requirements of the drive. The IP20 protection rating guards against finger contact, but the assembly must be installed inside a ventilated enclosure. The permitted duty rating is a 40% duty cycle, allowing the element to remain energized for a limited portion of each thermal cycle. A thermal time constant of 100 s indicates how quickly the temperature responds after the electrical load changes. Multiple drives may be connected in parallel as long as the combined resistance does not fall below 2.5 Ω. Mechanical mounting uses an M10 thread, while electrical connections require a 70 mm² power conductor and a 10 mm² grounding conductor. The preset load cycle lasts 120 seconds and includes a 72-second cooling interval.
The resistor measures 995 mm in width, 490 mm in depth, and 710 mm in height, making it suitable for floor-standing cabinets that provide sufficient vertical airflow. Its mass of 93 kg requires adequate structural support during installation and service. During a braking event, the element may remain active for up to 48 s before the required cooling period begins. Sufficient clearance around the resistor allows heated air to rise without exposing nearby equipment to excessive temperature. Design code 1 and line code 2 identify the assembly configuration used with the corresponding RZW mounting layout and accessories.
