RZW02.1-090-025 Bosch Rexroth Indramat
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The Bosch Rexroth Indramat RZW02.1-090-025 is a braking resistor from the RZW Braking Resistors series. It delivers a power rating of 90 kW and has a resistance of 3.7 ohms. The resistor weighs 80 kilograms and has dimensions of 795 mm width, 710 mm height, and 490 mm depth, with a protection class of IP20.
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Product Description:
The RZW02.1-090-025 braking resistor is manufactured by Bosch Rexroth Indramat and belongs to the RZW Braking Resistors series. In regenerative drive systems, this component converts surplus electrical energy into heat so the DC bus voltage stays within safe limits during rapid motor deceleration or changes in direction. It is used with Rexroth power units and other servo or inverter platforms that require controlled dissipation of braking energy in industrial automation systems.
The resistor can momentarily absorb 90 kW of braking power without exceeding its permitted temperature rise. Its fixed resistance of 3.7 Ω sets the current that flows when the resistor is switched across the drive’s DC link. An operating factor of 25% SD pairs a maximum conduction period of 30 s with a 120-second load cycle, allowing the element to cool between energized intervals. This duty profile helps prevent overheating during consecutive stopping cycles. The housing has an IP20 enclosure rating, providing basic protection against accidental finger contact while allowing natural airflow through the grille structure.
The resistor has a depth of 490 mm, a height of 710 mm, and a width of 795 mm. With a mass of 80 kg, it requires mounting surfaces that can support its static weight while maintaining suitable clearance from surrounding equipment. The minimum connectable resistance is 2.5 Ω, which limits the number of identical RZW units that may be connected in parallel without overloading the drive’s chopper transistor. A thermal time constant of 100 seconds indicates how quickly the element responds to heat accumulation during successive braking events. Design code 1 and line designation 2 identify the internal winding arrangement and terminal orientation used for this product group.
