RZW02.1-005-025 Bosch Rexroth Indramat
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The Bosch Rexroth Indramat RZW02.1-005-025 is part of the RZW Braking Resistors series and has a power rating of 5.5 kilowatts with a resistance of 47 ohms. This resistor measures 486 mm wide, 120 mm high, and 275 mm deep, and has an IP20 protection class. It is designed for a 25 percent operating factor and weighs 6.5 kilograms.
Internal Product Review
The RZW02.1-005-025 is a Bosch Rexroth Indramat RZW braking resistor rated at 5.5 kW with 47 Ω resistance. IP20 protection and a 25% operating factor support dependable braking duty in controlled cabinet installations. A 120 s load cycle with 300 s thermal time constant makes the unit a strong choice for consistent energy dissipation.
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Product Description:
The RZW02.1-005-025 belongs to the RZW Braking Resistors series manufactured by Bosch Rexroth Indramat. As a braking resistor, the device is connected across the DC bus of an inverter or servo controller so that regenerative energy produced during motor deceleration is converted into heat instead of raising the bus voltage. This function protects power semiconductors and helps the drive maintain controlled stopping in automated conveyors, packaging equipment, and material-handling systems. The resistor must be installed where the heat generated during braking can dissipate without affecting nearby electronic components.
The resistor can absorb up to 5.5 kW of electrical power during each braking cycle, and it has a resistance of 47 Ω. These ratings establish the braking current and energy load that the connected drive can direct through the resistor without exceeding its thermal limits. Continuous operation is not intended because an operating factor of 25% SD permits the element to remain energized for one quarter of each 120-second load cycle. The maximum operating time within that cycle is 30 seconds, followed by a required cooling period of 90 seconds. A power-reduction factor of 3.2 applies when the surrounding temperature rises above the reference conditions. The thermal time constant is 300 seconds, indicating how quickly the resistor core heats and cools as the load changes. A minimum connectable resistance of 30 Ω prevents the controller from operating with an excessively low-resistance braking load. Wiring uses two conductors, each with a cross-sectional area of 2.5 mm². The IP20 enclosure is intended for installation inside a ventilated control cabinet that restricts direct access to internal electrical parts.
The housing measures 275 mm deep, 486 mm wide, and 120 mm high, allowing sufficient cabinet space and airflow clearance to be allocated around the resistor. The assembly weighs 6.5 kg, so its mounting surface must support the resistor securely during machine operation. Threaded M6 mounting points provide fixed attachment to the cabinet structure, and the unit uses the Design 1 mounting arrangement. Adequate clearance around the housing helps prevent accumulated heat from raising the temperature of adjacent drive modules. The resistor should be positioned so that natural airflow can pass over the housing throughout repeated braking cycles.
