RZW02.1-090-060

Product Description:

Bosch Rexroth Indramat manufactured the RZW02.1-090-060. A key factor in braking dissipation during motor braking is the Bosch Rexroth Indramat RZW02.1-090-060 brake resistor’s 3.1-ohm resistance. Resistance controls the efficiency of kinetic energy conversion into thermal energy in resistive braking systems. Kinetic energy is recycled as electrical energy during deceleration. Ohm’s law states that the resistance value determines the rate of energy dissipation, and the voltage across this resistor increases with current. To avoid voltage spikes on the DC bus and keep the system stable, a 3.1 Ω resistor guarantees a controlled energy conversion rate. The RZW02.1-090-060 can handle high energy surges during fast braking, as shown by its ability to handle up to 81 kW peak power. The formula P = I²R or P = V²/R describes power dissipation in a resistive component. An 81 kW rated resistor can withstand high instantaneous power without thermal or structural damage. This is important in industrial environments because big spinning masses can suddenly slow down and generate regenerative energy bursts that need to be absorbed.

The system can thermal breakdown or shut down if power management is not adequate. The resistor is rated for continuous power of 90 kW in addition to its peak capability. This power class represents the resistor’s sustained power dissipation capability under specified duty cycles and ambient cooling conditions, not peak power, which is short-term tolerance. A robust thermal design that can withstand prolonged operation within specified thermal limits is indicated by the 90 kW rating. Because it means the resistor can handle average braking energy over extended cycles without going over its thermal design limits, this is important for system engineers when selecting components. Assuming proper thermal management is maintained by mechanical and environmental cooling methods, the resistor’s dual capability – to withstand transient high-power events and also operate reliably over long periods of time – is shown in the difference between the continuous and peak ratings.

The RZW02.1-090-060 is made of galvanized steel housing, which was chosen for its corrosion resistance and mechanical and thermal properties. The zinc barrier applied to the steel protects the steel from oxidative degradation. This is important in industrial environments where the steel is often exposed to abrasive conditions, chemical vapors and humidity. The zinc barrier physically protects the internal resistive components as well as ensures long-term durability. The exterior cooling design of the resistor is enhanced by the steel’s thermal conductivity, which allows heat to be transferred throughout the housing. Convective heat transfer is further improved by an axial ventilator which blows air over the heat dissipating surfaces. The resistor’s thermal balance during high-duty operation depends on this active ventilation.