RZW02.1-075-025 Bosch Rexroth Indramat
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The Bosch Rexroth Indramat RZW02.1-075-025 is a braking resistor from the RZW Braking Resistors series, featuring a peak power rating of 67 kW and a resistance of 5.4 ohms. This device has an IP20 protection class, weighs 56 kilograms, and measures 710 mm in height, 595 mm in width, and 490 mm in depth. Its maximum surface temperature is 80°C with an operating factor of 25 percent and a mounting thread of M10.
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Product Description:
Bosch Rexroth Indramat’s RZW02.1-075-025 is an industrial braking resistor from the RZW Braking Resistors series. Installed alongside supply and inverter units, the module converts surplus kinetic energy into heat, preventing DC-bus overvoltage during rapid deceleration or load reversals in servo or spindle drives. The Line 02 index and design code 1 identify its mechanical generation within the product range, while its classification supports pairing with appropriately sized drive converters.
Rated power dissipation reaches 75 kW, allowing the resistor to absorb surplus electrical power under the applicable operating conditions. For short regenerative bursts, it tolerates a peak of 67 kW, letting drives brake aggressively without triggering overvoltage faults. The resistance is 5.4 Ω, selected so the minimum connectable resistance of 3.75 Ω is maintained when multiple units are wired in parallel. An operating factor of 25% SD limits average heating, and the aluminum enclosure is vented on all sides to support heat dissipation. The enclosure measures 490 mm deep, 595 mm wide, and 710 mm high, requiring sufficient installation space and ventilation clearance inside the cabinet. M10 threaded mounting points simplify attachment to a suitable support surface, while the IP20 protection class helps prevent accidental contact with live conductor strips.
During cyclic duty, the resistor may be energized for 30 s followed by a recovery period of 90 s. This operating interval keeps the external fin temperature below 80 °C when the stated installation and duty conditions are observed. The thermal time constant of 100 s indicates how quickly the housing approaches thermal equilibrium after a step change in load. At 56 kg, the module adds substantial mass to the cabinet and requires adequate structural support during installation. The stated timing and thermal limits should be considered when scheduling deceleration profiles so cumulative heating remains within the resistor’s capacity.
