RZW02.1-037-060 Bosch Rexroth Indramat
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MPN: R911200226
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The Bosch Rexroth Indramat RZW02.1-037-060 is a braking resistor from the RZW Braking Resistors series with a power rating of 37 kW and a resistance of 7.2 ohms. It features IP20 protection, supports a thermal time constant of 100 seconds, and has a load cycle of 120 seconds. The unit weighs 80 kg and measures 795 mm in width, 710 mm in height, and 490 mm in depth.
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Product Description:
The RZW02.1-037-060 braking resistor is produced by Bosch Rexroth Indramat for the RZW Braking Resistors series. The product is design 1 within line 2 of the series and connects to the DC link of Indramat inverter systems. It absorbs regenerated energy from an AC drive’s DC bus and converts that energy into heat during motor deceleration. This process helps prevent DC-bus overvoltage in industrial automation systems when a connected motor slows down or stops. The resistor is suitable for applications in which regenerative energy cannot be returned to the power supply or stored elsewhere in the drive system.
This model is rated for continuous power dissipation of 37 kW, indicating how much electrical power it can convert into heat during braking. Its element resistance is 7.2 Ω, and the minimum connectable resistance is 7 Ω, making the unit compatible with drive modules that operate on 600 V DC links. The operating factor is 60% SD, meaning the resistor can remain active for 60 percent of each 120-second cycle without exceeding its permitted surface temperature. During that cycle, it can conduct for up to 72 s before cooling for 48 s. Deceleration ramps must remain within these operating periods to prevent excessive thermal loading. A cable with a 35 mm² cross-sectional area is recommended to limit conductor heating while carrying braking current.
A thermal time constant of 100 s indicates how quickly the resistor temperature approaches thermal equilibrium and helps establish safe intervals between high-energy stops. The enclosure measures 710 mm in height, 795 mm in width, and 490 mm in depth, providing a broad surface for heat dissipation through natural convection. With a mass of 80 kg, the resistor requires secure mounting and adequate structural support. M10 threaded mounting points accommodate fasteners suitable for the unit’s weight and expected vibration. The IP20 enclosure helps prevent accidental contact with live conductors but does not protect the unit from water. Adequate clearance around the cooling fins is necessary to maintain airflow and support the stated operating factor during extended production cycles.
