RZW03.1-055-040 Bosch Rexroth Indramat
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The Bosch Rexroth Indramat RZW03.1-055-040 is part of the RZW Braking Resistors series and has a power rating of 55 kW with a resistance of 5.5 Ohms. It features an IP23 protection class, measures 770 mm in height, 595 mm in width, and 490 mm in depth, and weighs 61 kilograms.
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Product Description:
The RZW03.1-055-040 braking resistor is produced by Bosch Rexroth Indramat within the RZW Braking Resistors series. Installed on the DC link of a servo or inverter system, the resistor dissipates energy returned by a decelerating motor so the drive bus voltage stays within safe limits. It converts excess electrical power into heat and protects the connected power module against overvoltage events in industrial automation. Design 1 of this model uses forced-air ventilation openings and can be secured through the M10 mounting points provided on its frame.
With a continuous dissipation capability of 55 kW, the unit can absorb the regenerative energy produced by medium-to-large inertia axes. Its nominal resistance of 5.5 Ω establishes the current that flows when the brake chopper closes, limiting peak bus voltage according to Ohm’s law. The permissible duty cycle has an operating factor of 40% SD within a 120-second load period. Accordingly, the resistor may be energized for up to 48 s and must then remain idle for at least 72 s to prevent thermal saturation. A 50 mm² supply conductor and a 10 mm² protective earth conductor are required to carry the resulting currents safely.
The IP23 housing supports installation in a control room or sheltered cabinet while allowing air to circulate through the cooling fins. The aluminum core reaches its operating temperature gradually, and a thermal time constant of 100 s indicates that it reaches 63% of its final temperature rise after heat dissipation begins. The enclosure has a width of 595 mm, a depth of 490 mm, and a height of 770 mm, providing the dimensions needed for installation planning. The 61 kg assembly is anchored with threaded M10 mounting points, which provide a stable connection to the supporting structure. Adequate clearance around the ventilation openings is necessary to maintain airflow and prevent excessive heat accumulation during repeated braking cycles.
