RZW02.1-007-040 Bosch Rexroth Indramat
Wake Industrial LLC is not an authorized distributor of this product.
MPN: R911200025
The Bosch Rexroth Indramat RZW02.1-007-040 is part of the RZW Braking Resistors series and has a power rating of 7.5 kW with a resistance of 33 Ohms. It features IP20 protection, a maximum surface temperature of 80°C, and an operating factor of 40%. The resistor weighs 9.5 kg and measures 490 mm wide, 300 mm deep, and 270 mm high.
Internal Product Review
The RZW02.1-007-040 is a Bosch Rexroth Indramat RZW braking resistor rated for 7.5 kW with 33 Ω resistance. IP20 protection and a 40% operating factor support dependable braking performance in controlled industrial cabinets. A 120 s load cycle with 80 °C maximum surface temperature makes the unit a strong choice for consistent energy dissipation.
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Product Description:
The RZW02.1-007-040 is a braking resistor manufactured by Bosch Rexroth Indramat for the RZW Braking Resistors series. As a dynamic load element, it absorbs surplus energy returned from an inverter during motor deceleration and converts that energy into heat, helping the DC-bus voltage remain within safe limits. This model belongs to design 1 and line 2 within the product group. Its aluminum housing measures 490 mm in width, 300 mm in depth, and 270 mm in height, allowing installation in control cabinets that provide adequate natural airflow. Sufficient clearance around the housing is necessary so the generated heat can escape without exposing nearby equipment to excessive temperatures.
The resistor has a continuous dissipation rating of 7.5 kW, allowing the drive to redirect regenerative power during braking. Its fixed resistance of 33 Ω determines the braking current for a given DC-bus voltage. The IP20 protection class guards against accidental finger contact but does not protect the resistor from water. An operating factor of 40% SD applies to the stated load cycle of 120 seconds, permitting the element to operate for up to 48 seconds before a cooling period is required. The corresponding maximum off-time is 72 seconds. A line cross-section of 2.5 mm² is required for the supply conductors, while a separate 10 mm² grounding conductor safely routes fault current to earth. Conductor sizing and cabinet ventilation must remain suitable for the electrical load and the heat produced during repeated braking cycles.
During intermittent operation, the resistor body surface may reach 80 °C, so adjacent components and wiring must tolerate the resulting heat. The thermal time constant is 100 seconds, indicating that the temperature difference decreases to about 37 percent of its initial value after one time constant during cooling. The unit has a total mass of 9.5 kg, which must be considered when selecting the mounting surface and fasteners. Applications requiring a lower initial braking current may use an external resistor network connected in series. The total system resistance must never fall below 30 Ω, because a lower value could allow excessive braking current. The mounting arrangement should also prevent direct contact with the hot housing while preserving access for inspection and wiring.
