RZW03.1-018-040

Product Description:

Bosch Rexroth Indramat manufactured the RZW03.1-018-040. The RZW03.1-018-040 brake resistor can dissipate 18.5 kW continuously, which means it can handle heat during dynamic braking cycles. With this power rating, there is no risk of thermal overload as the resistor can absorb and convert a lot of regenerative energy into heat. This is not only desirable but necessary in industrial motion systems, especially those with high-speed motors or quick deceleration of large inertial loads. A well-designed resistive element with good heat dissipation properties is one that can withstand large transient energy spikes without loosing structural or thermal integrity. Keeping the drive system stable, avoiding energy feedback into the inverter and ensuring safe operation under harsh conditions all depend on this kind of performance. To control the rate at which extra kinetic energy is dissipated during deceleration phases, this brake resistor has a nominal resistance of 18 ohms. Resistance determines the electrical load the drive sees and the rate at which energy is released as heat in regenerative braking applications.

A resistance too low will cause overcurrent situations, which will stress the resistor and the drive electronics; a resistance too high will cause a slow brake reaction as there will not be enough current flow. A calibrated balance that ensures braking torque production without exceeding safe current levels is reflected in the 18-ohm standard. To maintain component life and have fine control over stopping profiles, this value has been tuned for compatibility with common Rexroth drive systems. The housing of the RZW03.1-018-040 is made of galvanized steel, a material choice influenced by the need for environmental and thermal endurance. Galvanization creates a persistent zinc oxide layer on the steel surface, which improves corrosion resistance. This is especially important in industrial environments where chemicals, humidity and airborne particles are present.

Heat dissipation is maintained over time by thermal conduction from the resistive core to the surrounding air. Mechanical durability ensures resistance to deformation under vibration stress and temperature cycling, common in heavy-duty automation. By reducing the risk of corrosion-induced failures or enclosure fatigue, this material choice has a direct impact on the mean time between failures (MTBF). The IP23 rating of the resistor means it is protected against water sprayed at angles up to 60 degrees from vertical and objects bigger than 12 mm. For typical indoor industrial applications where the resistor is placed in a somewhat controlled environment or in a cabinet, this rating is sufficient. But unless combined with extra environmental protection it should not be used in areas that are wet or dusty.