RZW02.1-045-040 Bosch Rexroth Indramat
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MPN: R911200031
The Bosch Rexroth Indramat RZW02.1-045-040 is part of the RZW Braking Resistors series and has a power rating of 45 kW with a resistance value of 6.7 Ohms. This resistor measures 1000 mm in depth, 490 mm in width, 270 mm in height, and weighs 44 kilograms. It features an IP20 protection class and supports a conductor cross-section of 35 mm².
Internal Product Review
The RZW02.1-045-040 is a Bosch Rexroth Indramat RZW braking resistor rated at 45 kW with IP20 protection. A 6.7 Ω resistance and 40% SD operating factor make the unit well suited for dependable energy dissipation in controlled braking circuits. The 100 s thermal time constant is a strong match for repetitive deceleration duty.
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Product Description:
Bosch Rexroth Indramat manufactures the RZW02.1-045-040 braking resistor, which belongs to the RZW Braking Resistors series. This resistor is specified within the RZW Braking Resistor product group and serves as a dynamic energy absorber for servo inverters, converting excess regenerative power into heat during deceleration phases. In automated lines, the component prevents DC bus overvoltage and maintains controlled braking torque for connected drives.
Electrically, the resistor is rated for 45 kW of continuous dissipation when used within a duty cycle of 40% SD, meaning it may conduct for up to 48 s followed by a mandatory 72 s cool-off period to avoid thermal saturation. The internal stainless steel grid presents 6.7 Ω of nominal resistance, and drives with DC-link impedances down to the specified 6 Ω can be connected without exceeding thermal limits. Copper supply leads accept a cross-section of 35 mm², limiting conductor temperature rise while carrying the required current. The device follows resistor line 2 and design 1 rules inside the RZW catalog, and its resistor type is identified as B5 for compatibility with matching drive firmware.
Mechanically, the aluminum housing measures 1000 mm in depth, 490 mm in width, and 270 mm in height, allowing straightforward placement along panel walls. Two mounting flanges drilled for M10 hardware secure the assembly while ensuring the required air gap on all sides for convection. The unit carries a mass of 44 kg and exhibits a thermal time constant of 100 s, so enclosure airflow must maintain acceptable surface temperatures during consecutive braking sequences. An IP20 protection class limits installation to dust-free, touch-safe cabinets, but no additional sealing is needed once the spacing guidelines of the B5 resistor type are met.
