RZW02.1-037-025 Bosch Rexroth Indramat
Wake Industrial LLC is not an authorized distributor of this product.
MPN: R911200399
The Bosch Rexroth Indramat RZW02.1-037-025 is a braking resistor from the RZW Braking Resistors series. It offers a peak power rating of 33 kW, 7.3 Ohms resistance, and a thermal time constant of 100 seconds. The resistor measures 600 mm in depth, 490 mm in width, 270 mm in height, and weighs 22 kg.
Internal Product Review
The RZW02.1-037-025 is a Bosch Rexroth Indramat RZW braking resistor rated for 37 kW power data with 33 kW peak power. A 7.3 Ω resistance with 7 Ω minimum connectable resistance supports dependable braking integration and clean matching in drive systems. IP20 protection and a 25% operating factor make this unit a well-balanced choice for controlled cabinet installations.
To contact sales for pricing and lead time:
Payment Methods
Shipping Methods
Our Credentials
Product Description:
The RZW02.1-037-025 braking resistor is manufactured by Bosch Rexroth Indramat as part of the RZW Braking Resistors series. This passively cooled module connects across the DC link of a drive controller and converts kinetic energy returned by a motor into heat rather than allowing the bus voltage to rise. By providing a controlled outlet for regenerated energy, it supports rapid deceleration and helps prevent overvoltage trips in production lines, material-handling systems, and other industrial automation applications. The resistor operates without active cooling components, so its installation must allow sufficient space for heat to dissipate into the surrounding air.
The unit has a continuous rating of 37 kW and a separate rapid-stop rating of 33 kW. Its fixed resistance is 7.3 Ω, which regulates DC-link current and supports drives that require a similar braking impedance. A thermal time constant of 100 s governs how quickly the resistor responds to changes in heat load. The IP20 housing protects against contact with large solid objects but requires installation inside a suitable cabinet. The enclosure measures 490 mm wide, 600 mm deep, and 270 mm high, creating a relatively flat profile for mounting behind inverter stacks. The unit is supplied as Design 1 in Line 2 and operates with a 120-second load cycle consisting of 30 seconds of conduction followed by 90 seconds of cooling. Cabinet airflow and mounting clearances must accommodate the heat released during each conduction period.
The permitted operating factor is 25% SD, meaning that energy dissipation may occur during only one quarter of each duty cycle. During active braking intervals, the external fins must remain below a surface temperature of 80 °C. With a mass of 22 kg, the module has sufficient thermal inertia to moderate abrupt temperature increases while remaining suitable for secure panel mounting. Drives that require lower impedance may use additional braking resistors connected in parallel, provided that the total load remains within the drive controller’s permitted range. The lowest allowable resistance for a single resistor is 7 Ω, which protects the braking chopper transistor against excessive current. Power wiring must be sized for the expected braking current, and nearby components should be positioned away from the resistor’s heated surfaces. Adequate ventilation is necessary to prevent accumulated heat from affecting adjacent drive modules or control wiring.
