RZW01.1-007-NNN Bosch Rexroth Indramat
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MPN: R911200016
The Bosch Rexroth Indramat RZW01.1-007-NNN is part of the RZW Braking Resistors series and is housed in aluminum with ceramic insulation material. It features a power rating of 7.5 kW, a resistance of 35 ohms, and uses a heavy-duty metal alloy resistive element. The braking resistor weighs 1.5 kg and has a maximum housing temperature of 100 degrees Celsius.
Internal Product Review
The RZW01.1-007-NNN is a Bosch Rexroth Indramat braking resistor rated for 7.5 kW with 35 Ω resistance. Aluminum housing and ceramic insulation support stable heat management and dependable service in braking applications. A 185 s thermal time constant adds strong technical value for controlled energy dissipation.
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Product Description:
The RZW01.1-007-NNN braking resistor is manufactured by Bosch Rexroth Indramat within the RZW Braking Resistors series. Installed across the intermediate circuit of a drive, it converts regenerative energy into heat so that servo axes can decelerate without triggering a DC-bus overvoltage fault. The module belongs to size class A and uses the first design and line identifiers issued for this product family. Its compact format allows it to mount alongside other components that use a 22.5 mm grid in automation cabinets.
The unit’s resistive element is rated at 35 Ω, a value selected to limit peak current while still reducing excess bus voltage quickly. During continuous duty, it can dissipate 7.5 kW of thermal power, matching the braking requirements of medium-inertia drives. The mechanical width follows a construction grid of 22.5 mm, and this standardized pitch simplifies DIN-rail alignment while preserving airflow paths. A thermal time constant of 185 s indicates how long the aluminum housing and ceramic insulation take to reach 63% of their final temperature after a load step. This value can be used when calculating permissible braking cycles. The enclosure may reach a maximum surface temperature of 100 °C, so adjacent wiring must be routed with heat-resistant insulation and kept away from hot surfaces.
Installation requires a vertical cooling clearance of 100 mm to maintain natural convection around the fins. Heat is conducted outward through an aluminum housing, while a heavy-duty metal-alloy element remains bonded to ceramic supports for dielectric strength at high temperatures. The assembly supports a rated humidity of up to 90%. Its total mass is 1.5 kg, allowing panel mounting without additional support brackets. During emergency stops, the module tolerates peak energy bursts for a specified duration of 1 s. After that interval, operation must return to the permitted ED duty factor to prevent the resistor materials from exceeding their thermal limits.
