RZW01.1-045-NNN Bosch Rexroth Indramat
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MPN: R911200023
The Bosch Rexroth Indramat RZW01.1-045-NNN is part of the RZW Braking Resistors series and is designed with a power rating of 45 kW and a resistance of 5.8 Ohms. This resistor has a peak power capability of 111 kW for 1 second, a thermal time constant of 185 seconds, and weighs 5.6 kilograms. It features a maximum housing temperature of 100 degrees Celsius and a maximum relative humidity rating of 90%.
Internal Product Review
The RZW01.1-045-NNN is a Bosch Rexroth Indramat RZW braking resistor with 45 kW power data and 5.8 Ω resistance. A 111 kW peak power rating for 1 second and a 185 s thermal time constant support reliable energy dissipation during demanding braking cycles. A well-engineered choice for drive systems requiring stable braking performance and strong short-term overload capacity.
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Product Description:
The RZW01.1-045-NNN is a braking resistor module manufactured by Bosch Rexroth Indramat for the RZW Braking Resistors series. As a dynamic energy absorber, the resistor connects to drive controllers and converts regenerated motor energy into heat during deceleration cycles, protecting the DC bus from overvoltage. The device belongs to size class C in the series, and its design and line identifiers are both coded as 1, indicating the mechanical format and thermal layout used across this product group.
The resistor’s continuous dissipation capability is 45 kW, giving the drive system a fixed thermal ceiling for repetitive braking duty. For one-second peaks, it withstands 111 kW, a rating that accommodates emergency stops or the deceleration of high-inertia loads. Electrical loss is set by a resistance of 5.8 Ω, which determines the discharge current drawn from the DC link. The housing may reach 100 °C at maximum load, so cabinet ventilation must be suitable for this surface temperature. Operation is allowed at up to 90% relative humidity without condensation. Mounting follows a 22.5 mm grid, allowing the heat sink to align with standard back-panel perforations. The ED operating factor sets the permitted duty cycle for repeated braking pulses.
Thermal inertia is represented by a time constant of 185 s, meaning the element requires just over three minutes to reach 63% of its final temperature after a load step. The module weighs 5.6 kg, so the cabinet structure and mounting hardware must provide adequate support. A top clearance of 100 mm must be maintained so convective airflow can exit the fins without obstruction. This clearance also helps prevent discharged heat from accumulating around neighboring equipment. The resistor should be positioned where its heated surfaces cannot damage nearby wiring, sensitive electronics, or enclosure materials during sustained braking. Appropriate ventilation and spacing are particularly important when the resistor repeatedly operates near its continuous dissipation limit.
