RZW03.1-090-015 Bosch Rexroth Indramat
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The Bosch Rexroth Indramat RZW03.1-090-015 is a braking resistor belonging to the RZW Braking Resistors series and has a power rating of 90 kW with a resistance value of 3.3 ohms. This unit weighs 61 kg, measures 995 mm wide by 520 mm high by 490 mm deep, and is protected by an IP23 rating. It features a thermal time constant of 100 seconds and a maximum on time of 18 seconds, with a terminal size of M10.
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Product Description:
The RZW03.1-090-015 is a braking resistor built by Bosch Rexroth Indramat for the RZW Braking Resistors series. In regenerative or rapid-deceleration drive systems, this component converts surplus kinetic energy from the DC bus into heat so the inverter can keep the DC voltage within safe limits. It is intended for panel or cabinet mounting in industrial automation lines where controlled motor stopping is required.
This model is rated for 90 kW of thermal dissipation during each duty cycle. Its fixed resistance of 3.3 Ω determines the current that flows when the drive diverts energy into the resistor network. The unit may be energized for a maximum of 18 s and must remain de-energized for 102 s. This timing pair corresponds to a 120-second load cycle and an operating factor of 15% SD. A conductor cross-section of 50 mm² is recommended so the wiring can handle peak braking currents without excessive heating. The minimum connectable resistance is 2.5 Ω, allowing multiple units to be wired in series or parallel when the drive requires a different braking profile. Connection to the bus bars is made through M10 terminals. The thermal time constant is 100 seconds, indicating how quickly the resistor element heats in response to braking energy.
The housing stands 520 mm high, spans 995 mm in width, and extends 490 mm in depth, providing sufficient surface area for natural convection while fitting within industrial enclosures. Its IP23 protection class permits installation in indoor areas where falling dirt or light water spray may occur, but the unit should not be exposed to direct water jets. With a mass of 61 kg, the resistor requires secure mechanical anchoring to support its weight during operation. The housing uses the single-sheet steel configuration identified as Design 1, which supports installation in standard Rexroth drive cabinets. Adequate clearance around the enclosure allows heated air to rise away from the resistor and helps prevent heat accumulation near adjacent components.
