RZW02.1-045-015 Bosch Rexroth Indramat
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The Bosch Rexroth Indramat RZW02.1-045-015 is a braking resistor in the RZW Braking Resistors series. The resistor provides a resistance of 6.6 Ohms and 45 kW power rating, with a protection class of IP20. It measures 600 mm in depth, 490 mm in width, 270 mm in height, and weighs 22 kilograms.
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Product Description:
The RZW02.1-045-015 braking resistor is produced by Bosch Rexroth Indramat for the RZW Braking Resistors series. It is installed on the DC link of drive controllers to absorb regenerated energy during motor braking, converting the energy into heat and preventing overvoltage trips in industrial automation lines. The device follows design 1 in line 2 of the platform, with a mechanical layout and wiring pattern intended for integration inside equipment enclosures.
The resistor handles a continuous energy conversion rate of 45 kW, which indicates the permissible braking power that the associated inverter may feed into it. Its resistance of 6.6 Ω matches the DC bus voltage so that current remains within the drive’s switching limits. With a protection rating of IP20, the housing prevents accidental finger contact with internal components but requires installation in a ventilated cabinet. The maximum casing temperature is limited to 80 °C, so adequate airflow and clearance are required around the unit. The enclosure measures 270 mm high and 490 mm wide, with a depth of 600 mm. Its aluminum body weighs 22 kg and includes M10 terminals that accept ring lugs. The wiring arrangement permits connection to total bus resistance values as low as 6 Ω when multiple units operate in parallel.
The resistor may be energized for only part of each 120-second cycle. An operating factor of 15% SD corresponds to a maximum energized period of 18 s, followed by an off-time of 102 s that allows accumulated heat to dissipate. These intervals work with the resistor’s thermal time constant of 100 s, which indicates how quickly its internal temperature responds to a power burst and subsequent cooling period. Maintaining the required timing prevents excessive heat accumulation during repetitive machine stops. The cabinet must provide sufficient ventilation throughout operation, particularly when braking cycles occur frequently or several resistors are installed near one another. Proper separation from heat-sensitive components also reduces the effect of radiant and convective heat within the enclosure.
