RZK01.1-200-BW Bosch Rexroth Indramat
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MPN: R911200229
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The Bosch Rexroth Indramat RZK01.1-200-BW is part of the RZK Heat Exchangers series and has a brake resistor nominal power of 2.5 kW with a peak power rating of 370 kW. This unit provides 5 kW of cooling power, can be mounted outside a cabinet, and comes with an IP20 protection class. It weighs 23 kilograms and has a maximum housing surface temperature of 80 °C.
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Product Description:
The RZK01.1-200-BW is a compact heat-exchange assembly produced by Bosch Rexroth Indramat for the RZK Heat Exchangers series. Installed as an auxiliary module alongside drive controllers, it combines a forced-air cooler with an integrated brake resistor so that excess electrical and thermal energy generated during rapid motor deceleration is removed from the control cabinet. By routing warm airflow outside the enclosure, the unit helps automation lines maintain stable component temperatures, protect electronic service life, and meet enclosure derating limits used with high-power motion systems.
The resistor portion can absorb a continuous dissipation of 2.5 kW, while short transients are handled at up to 370 kW for 0.1 s. That overload capability is possible because the resistor value is set at 1.6 Ω, creating a current path that clamps DC-bus voltage without overloading the drive IGBTs. At the same time, the heat exchanger provides a cooling capacity of 5 kW, so the thermal load from both the resistor and nearby electronics is conveyed to ambient air through its fin matrix and axial fan. The assembly has a thermal time constant of 14.3 s, indicating how quickly the housing temperature reacts to step changes in heat generation during repeated braking cycles.
Power connections reach the resistor through bus bars rated at 2 × 16 mm², and protective earth uses a single 16 mm² conductor (AWG 4) so fault-current paths remain below allowable touch-voltage limits. Housing surface temperature is limited to 80 °C, permitting mounting on machine frames that also carry cabling or pneumatics. Because the device meets the IP20 protection class, it must be positioned in clean indoor areas, and Bosch Rexroth recommends at least 200 mm of free space above the top grill to sustain airflow. The structure weighs 23 kg and is designed for outside-cabinet installation, which can simplify retrofit work on existing control panels.
Frequently Asked Questions about RZK01.1-200-BW:
Q: What is the nominal power rating of the brake resistor on the RZK01.1-200-BW?
A: The RZK01.1-200-BW supports a brake resistor nominal power rating of 2.5 kW.
Q: What is the mounting type for the RZK01.1-200-BW heat exchanger?
A: This model is designed for outside cabinet mounting.
Q: What is the maximum permissible housing surface temperature for the RZK01.1-200-BW?
A: The maximum housing surface temperature allowed for this unit is 80°C.
Q: How much cooling power does the RZK01.1-200-BW provide?
A: The RZK01.1-200-BW offers a cooling power capacity of 5 kW.
Q: What protection class is the RZK01.1-200-BW heat exchanger rated for?
A: Its protection class is rated at IP20 for electrical enclosure requirements.
