RZW03.1-055-006 Bosch Rexroth Indramat
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MPN: R911201212
The Bosch Rexroth Indramat RZW03.1-055-006 is part of the RZW Braking Resistors series and features a power rating of 55 kW with a resistance of 6.1 Ohms. The unit measures 520 mm in height, 395 mm in width, and 490 mm in depth, with a weight of 26 kg. It is designed for 6% duty cycle operation and offers protection class IP23.
Internal Product Review
The RZW03.1-055-006 is a Bosch Rexroth Indramat RZW braking resistor rated for 55 kW with 6.1 Ω resistance. IP23 protection and a 6% operating factor support dependable braking duty in controlled industrial environments. A 100 s thermal time constant is a strong fit for repeatable energy dissipation.
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Product Description:
The RZW03.1-055-006 braking resistor is produced by Bosch Rexroth Indramat for the RZW Braking Resistors series. Installed on the DC link of a servo or inverter system, it converts surplus kinetic energy into heat whenever the connected drive decelerates. By providing a controlled discharge path, the unit keeps the intermediate circuit voltage within safe limits and protects power electronics during dynamic stopping sequences that are common in material-handling, packaging, and machine-tool applications. This arrangement is especially useful on axes that must absorb repeated bursts of regenerated energy during frequent braking events.
This air-vented assembly can absorb up to 55 kW of power during each allowed braking interval. Its resistor grid presents a cold value of 6.1 Ω, keeping brake current within the range expected by compatible Rexroth drives. The housing carries a protection rating of IP23, so it blocks fingers and falling water drops but should be installed in an enclosure where dust exposure is controlled. The permissible on-state lasts a maximum of 7.2 s; after that, the resistor requires a cool-down pause of 112.8 s to prevent thermal saturation and protect the insulation system.
Thermal behavior follows a time constant of 100 s, so temperature rise remains gradual and predictable under cyclic duty. Even at peak load, the external surface is limited to 80 °C, which helps reduce heat transfer to nearby components when free airflow is maintained. The allowable average duty is an operating factor of 6% SD, matching the 120-second load cycle used in Bosch Rexroth sizing charts. With a mass of 26 kg, the unit requires a mounting surface that can support it securely. Overall dimensions and connection data include a depth of 490 mm, a width of 395 mm, a height of 520 mm, a line-terminal cross-section of 16 mm², and a minimum connectable resistance of 5 Ω for parallel combinations.
