RZW03.1-160-006 Bosch Rexroth Indramat
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The Bosch Rexroth Indramat RZW03.1-160-006 is a braking resistor from the RZW Braking Resistors series and has a power rating of 160 kW with a resistance of 2.6 ohms. It features a protection class of IP23, a line cross-section of 50 mm², and weighs 61 kilograms. The unit measures 995 mm in width, 520 mm in height, and 490 mm in depth.
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Product Description:
The RZW03.1-160-006 braking resistor is a passive energy-dissipation module built by Bosch Rexroth Indramat for the RZW Braking Resistors series. Installed on the DC link of an Indramat drive, it converts surplus regenerative energy from motor deceleration into heat, preventing overvoltage trips and protecting the inverter. This resistor is a common accessory in conveying, lifting, and positioning systems where frequent braking cycles occur during industrial automation tasks.
With a rated power absorption of 160 kW, the unit can accept high instantaneous energy pulses before reaching its thermal limits. Its nominal resistance of 2.6 Ω determines the braking current that flows at a given DC-bus voltage, allowing appropriate dissipation profiles to be calculated. The enclosure carries an IP 23 classification, so it withstands falling water drops and objects larger than 12 mm while remaining ventilated for convection cooling. An operating factor of 6% SD means the resistor may conduct for only a small fraction of each duty period because of the resulting internal temperature rise. Within that cycle, the maximum energized interval is 7.2 s, and the operating layout must ensure that this limit is not exceeded. The unit measures 490 mm deep, 995 mm wide, and 520 mm high, while its connection lugs accept 50 mm² bus conductors. It has design code 1 and uses a 120-second load cycle for calculating the permitted braking duty.
After every braking burst, the element requires an off interval of 112.8 s so its core temperature can fall below the permissible threshold. If a lower equivalent resistance is necessary, several units can be wired in parallel down to a minimum connectable value of 2.2 Ω, provided the resulting current remains within the drive transistor limits. The thermal mass has a time constant of 100 s, indicating how quickly the aluminum fins and ceramic carriers store and release heat during cycling. At 61 kg, the assembly must be supported on a rigid panel or frame. Its placement inside the control enclosure should preserve open airflow paths around the ventilated housing. Adequate clearance also prevents nearby wiring and temperature-sensitive components from being exposed to concentrated heat during repeated braking cycles.
