RZW01.1-055-NNN Bosch Rexroth Indramat
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The Bosch Rexroth Indramat RZW01.1-055-NNN is a braking resistor from the RZW Braking Resistors series with a power rating of 55 kW and a resistance of 5.0 ohms. It features a thermal time constant of 185 seconds and supports a peak power duration of 1 second. This unit weighs 7.1 kilograms and is designed to operate in ambient temperatures up to 40 °C.
Internal Product Review
The RZW01.1-055-NNN is a Bosch Rexroth Indramat RZW braking resistor rated for 55 kW with 5.0 Ω resistance. A 185 s thermal time constant and ED design support stable braking energy handling in drive systems. For controlled industrial installations, a 40 °C ambient maximum makes this unit a strong choice.
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Product Description:
The RZW01.1-055-NNN is a braking resistor module manufactured by Bosch Rexroth Indramat and assigned to the RZW Braking Resistors series. It is installed across the DC link of a Rexroth drive controller so regenerative current produced during motor braking is diverted into its resistor network and dissipated as thermal energy, preventing overvoltage trips in automated machines. The unit follows the 22.5 mm construction grid used for the series, allowing it to fit into standardized panel layouts beside inverters and contactors without custom brackets.
The module has a continuous absorption capability of 55 kW, which indicates the average power the resistor can convert to heat during extended dynamic cycles. The internal network has a resistance of 5.0 Ω, which determines the current drawn from the DC bus at a given voltage. The module can handle short surges at peak power for up to 1 s before reaching its thermal limits. Its mass and fin area provide a thermal time constant of 185 s, indicating how quickly its temperature rises after energy intake begins. Safe installation in an enclosure requires a minimum air gap of 100 mm above the heat sink so natural airflow can remove accumulated heat.
The module can be stored at temperatures from -25 °C to 70 °C, while its maximum operating ambient temperature is 40 °C to keep the resistor elements within their operating limits. During continuous braking, the housing surface must not exceed 100 °C, which must be considered when arranging touch protection and thermal monitoring. The module tolerates up to 90 % relative humidity without condensation, supporting installation in production areas with elevated moisture. Its total weight is 7.1 kg, allowing secure panel mounting within the dynamic load limits of moving machinery frames. The dual-element design distributes generated heat across two resistors to reduce concentrated thermal loading.
