RZW02.1-004-025 Bosch Rexroth Indramat
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The Bosch Rexroth Indramat RZW02.1-004-025 is part of the RZW Braking Resistors series and has a power rating of 4 kW with a resistance of 47 ohms. The resistor features IP20 protection class, supports operating temperatures from 0 to 40 °C, and measures 486 mm in width, 120 mm in height, and 185 mm in depth. It weighs 4.3 kg and has a maximum humidity tolerance of 90 percent.
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Product Description:
Bosch Rexroth Indramat supplies the RZW02.1-004-025 braking resistor as part of its RZW Braking Resistors series. The module connects to regenerative inverters and servo drives, converting surplus kinetic energy into heat so that the DC bus voltage stays within safe limits during rapid deceleration cycles. This process protects the power electronics and keeps motion systems stable in industrial automation lines. The resistor is preassembled in a ventilated enclosure and provides screw-terminal interfaces for the main conductors and protective grounding conductor, simplifying its integration into a drive cabinet. Its enclosed format also helps prevent accidental contact with the resistor element while allowing generated heat to escape through the available ventilation openings.
The unit absorbs up to 4 kW of braking power when operated according to its specified duty cycle. The element has a resistance of 47 Ω, which limits peak current on 700 V DC links. Parallel configurations must maintain a minimum connectable resistance of 30 Ω to avoid overloading the braking chopper. The module uses design code 1 and line 2 layouts. Its terminals accept 2.5 mm² supply conductors and a 10 mm² protective grounding conductor. Operation must remain within an intermittent duty factor of 25% SD because longer loading periods can cause the resistor element to approach its thermal limit. The thermal time constant is 300 s, indicating how quickly the resistor responds to heating and cooling during repeated braking cycles. Adequate pauses between demanding deceleration events allow stored heat to dissipate before the next pulse occurs.
The enclosure measures 486 mm wide, 120 mm high, and 185 mm deep, providing a broad surface for heat dissipation while maintaining a shallow profile for drive cabinets. Its total mass is 4.3 kg, which limits the additional load placed on mounting rails and cabinet structures. During operation, the housing can reach 80 °C, so it must be positioned away from heat-sensitive wiring and components. Ventilation must keep the surrounding air between 0 °C and 40 °C to prevent excessive thermal buildup. Relative humidity can reach 90% as long as condensation does not form on the enclosure or electrical connections. The enclosure has an IP20 protection rating, providing protection against finger contact with internal parts but not against sprayed liquids. Sufficient clearance around the ventilation openings is necessary to maintain natural airflow and prevent heat from accumulating around the resistor housing.
