RZW03.1-075-025 Bosch Rexroth Indramat
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The Bosch Rexroth Indramat RZW03.1-075-025 is part of the RZW Braking Resistors series and has a power rating of 75 kW with a resistance of 5.4 Ohms. This resistor is rated for IP23 protection, with dimensions of 770 mm in height, 595 mm in width, 490 mm in depth, and a weight of 61 kilograms. It features a maximum surface temperature of 80 degrees Celsius and an operating factor of 25% SD.
Internal Product Review
The RZW03.1-075-025 is a Bosch Rexroth Indramat RZW braking resistor rated for 75 kW with 5.4 Ω resistance. IP23 protection and a 25% operating factor make the design a dependable choice for controlled braking duty in industrial drive systems. A 100 s thermal time constant is a valuable performance feature for repeated deceleration cycles.
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Product Description:
The RZW03.1-075-025 is a braking resistor unit produced by Bosch Rexroth Indramat for the RZW Braking Resistors series. In industrial automation, the module connects to drive controllers and converts excess regenerative energy into heat, preventing DC-bus overvoltage when motors decelerate or reverse. The device follows Design 1 construction guidelines and accepts conductors with a cross-sectional area of 50 mm² for connection to supply bars. This arrangement allows the resistor to receive regenerated electrical power from compatible drive systems during controlled braking events.
The resistor has a continuous power capability of 75 kW and a nominal resistance of 5.4 Ω, allowing drives to dissipate high currents without exceeding the permissible voltage. Applications that require shorter duty cycles can connect units down to a minimum resistance of 3.75 Ω. An operating factor of 25% SD allows the element to remain energized for one quarter of each 120-second load cycle, while the maximum on-time is limited to 30 seconds per cycle to keep the resistor within its thermal limits. The assembly has an IP23 protection rating, which guards internal parts against contact by objects larger than 12.5 mm and against water sprayed at angles up to 60 degrees from vertical. The housing measures 770 mm in height, 595 mm in width, and 490 mm in depth, allowing it to fit within suitably sized industrial enclosures. Forced cabinet ventilation helps remove the heat released during braking and maintains airflow around the resistor housing.
The allowable cooldown interval of 90 seconds follows the heating window and works with a thermal time constant of 100 seconds to prevent cumulative temperature rise during repeated load cycles. The housing has a surface temperature ceiling of 80 °C maximum, helping protect adjacent equipment from excessive heat exposure. With a mass of 61 kg, the resistor can be positioned with suitable lifting equipment and secured to a support structure rated for its weight. Its mounting location must provide sufficient clearance for airflow and prevent heat from becoming trapped near temperature-sensitive components.
