RZW02.1-045-060 Bosch Rexroth Indramat
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The Bosch Rexroth Indramat RZW02.1-045-060 is a braking resistor from the RZW Braking Resistors series with a resistance of 7 Ohms and a peak power rating of 40 kW. It features a protection class of IP20, an operating factor of 60 percent, and weighs 80 kilograms. The unit measures 795 mm wide, 710 mm high, and 490 mm deep.
Internal Product Review
The RZW02.1-045-060 is a Bosch Rexroth Indramat RZW braking resistor with 45 kW power data and 7 Ω resistance. IP20 protection and an 80 °C maximum surface temperature support dependable integration in controlled industrial panels. A 40 kW peak power rating makes the unit a strong choice for consistent braking energy dissipation.
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Product Description:
The RZW02.1-045-060 braking resistor is produced by Bosch Rexroth Indramat as part of the RZW Braking Resistors series. The module connects to the DC link of an Indramat drive and converts regenerative energy into heat whenever the motor decelerates, preventing overvoltage in the power section. In automated handling cells, press lines, or gantry axes, it serves as a dissipation element that supports fast braking cycles and limits stress on the drive electronics. The resistor is intended for installation inside a suitable control cabinet rather than for exposed mounting on a machine.
The resistor is built to Design 1 on Line 2 and has a rectangular steel enclosure measuring 710 mm high, 795 mm wide, and 490 mm deep. Its terminals accept copper conductors up to 50 mm², allowing the wiring to carry the high discharge currents associated with its 40 kW peak power rating. The ceramic element has a resistance of 7 Ω, while the minimum allowable resistance is 6 Ω to keep the braking current within the permitted range of the companion inverter. During a duty cycle, the unit may remain energized for a maximum on-time of 72 seconds. The unit has a 60% duty cycle, which limits average thermal loading during repeated braking events. A drilled cover with an IP20 rating prevents accidental contact with internal parts while permitting natural airflow through the cooling fins.
The resistor has a continuous power capacity of 45 kW when it operates under the required cooling conditions. After a braking sequence, the control system must observe a 48-second off interval before the next pulse, allowing the enclosure to release accumulated heat. The permitted surface temperature is 80 °C, and the assembly has a mass of 80 kg, which provides thermal mass that slows the temperature increase. Its 100-second thermal time constant indicates the delay between electrical loading and the resulting surface temperature change. Adequate cabinet clearance is necessary to maintain airflow around the enclosure and prevent heat from accumulating near adjacent drive components. The mounting structure must also support the resistor securely and keep heat-sensitive wiring away from hot surfaces during repeated regenerative braking cycles.
