Product Description:

The RZW01.1-003-NNN braking resistor is manufactured by Bosch Rexroth Indramat as part of the RZW Braking Resistors series. Installed on the DC link of an inverter, it converts excess kinetic energy into heat during motor deceleration, which helps prevent overvoltage faults and protects drive electronics. This type of resistor is used when a driven axis must shed returned energy quickly instead of sending it back into the drive. It is suited to automated machinery that relies on controlled stopping and repeated braking events.

Its braking power is rated at 3 kW, so the unit is intended to dissipate that amount of energy within its stated duty cycle. A resistance of 60 Ω limits the current drawn from the intermediate circuit and suits common servo drive voltage ranges. During sustained use, the housing can reach a surface temperature of 80 °C, so nearby components and wiring must be arranged with heat exposure in mind. The thermal response is characterized by a time constant of 185 s, which means the temperature changes with a noticeable delay as the braking load rises or falls. Even with that thermal capacity, the resistor has a mass of only 1.5 kg, which supports straightforward mounting inside a control cabinet or on a panel.

The mechanical format follows design 1 and is assigned to line 1, which places it within an early RZW layout style. Its operating mode is listed as ED design, indicating intermittent duty rather than uninterrupted full-load dissipation. The resistor is also classified in size class A, giving it a compact form within the product group. That compact format is useful where cabinet space is limited but a matching resistor value is still required for controlled braking. The combination of electrical rating, thermal behavior, and mounting-friendly mass makes this unit appropriate for inverter systems that need a dedicated external path for braking energy.