RZW02.1-005-040 Bosch Rexroth Indramat
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MPN: R911200247
The Bosch Rexroth Indramat RZW02.1-005-040 is a braking resistor in the RZW Braking Resistors series with a peak power of 5 kW and a resistance of 47 ohms. This resistor has an IP20 protection class and weighs 7.5 kilograms, featuring dimensions of 120 mm in height, 586 mm in width, and 275 mm in depth. Its maximum surface temperature is 80 degrees Celsius, and it allows a maximum on-time of 48 seconds with a 40% operating factor.
Internal Product Review
The RZW02.1-005-040 is a Bosch Rexroth Indramat RZW braking resistor designed for dependable energy dissipation in drive braking circuits. A 47 Ω resistance with 5 kW peak power supports stable braking performance and consistent electrical matching. IP20 protection and a 40% operating factor make the unit a strong choice for controlled cabinet installations.
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Product Description:
The RZW02.1-005-040 braking resistor is manufactured by Bosch Rexroth Indramat for the RZW Braking Resistors series. In an industrial automation drive, this component is wired across the converter’s DC link and dissipates surplus regenerative energy as heat, preventing overvoltage trips during rapid motor braking or load reversal. Its role is purely resistive, so it has no moving parts and requires only sufficient airflow to keep the housing within the permitted temperature range. This operating principle makes the resistor suitable for drive systems in which motors frequently return energy to the DC bus during deceleration.
The resistor element has a nominal resistance of 47 Ω, which determines the current that flows at a given DC-bus voltage. During peak dissipation, it can absorb up to 5 kW for short intervals, and its thermal mass reaches equilibrium according to a 300 s thermal time constant. Continuous duty is governed by a rated duty cycle of 40% SD, so each load cycle must include enough idle time to limit average heating. The enclosure has an IP20 protection rating, making the module finger-safe while requiring installation inside a ventilated cabinet. Additional electrical limits include a power rating of 5.5 kW, a maximum surface temperature of 80 °C, and a minimum connectable resistance of 30 Ω when multiple units are wired in parallel. Cabinet ventilation must accommodate the heat released during braking without obstructing airflow around the resistor housing.
The allowable on-time is 48 s, followed by a required 72 s off-time to prevent thermal overload. A mass of 7.5 kg helps moderate temperature changes, and the housing mounts to a back panel with a mounting depth of 240 mm and a mounting width of 526 mm. Its overall width is 586 mm. Safe bonding to the cabinet ground bar requires a conductor with a minimum cross-sectional area of 10 mm², while the power leads attach to M6 threaded terminals. The housing has an overall depth of 275 mm and a height of 120 mm, leaving routing space above and below the heat-radiating fins. The back panel must provide firm support for the resistor’s weight while preserving the clearances needed for cable routing and heat dissipation.
