RZW03.1-018-040 Bosch Rexroth Indramat
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The Bosch Rexroth Indramat RZW03.1-018-040 is part of the RZW Braking Resistors series and has a power rating of 18.5 kW with a nominal resistance of 18 Ohms. It features an IP23 protection class and measures 520 mm in height, 490 mm in depth, and 395 mm in width. The resistor weighs 26 kg and has a maximum housing temperature of 80 degrees Celsius.
Internal Product Review
The RZW03.1-018-040 is an RZW braking resistor rated at 18.5 kW with 18 Ω resistance. IP23 protection and an 80 °C maximum housing temperature support dependable service in demanding drive systems. A 40% operating factor across a 120 s load cycle makes the unit a strong choice for repeat braking applications.
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Product Description:
The RZW03.1-018-040 braking resistor is manufactured by Bosch Rexroth Indramat as part of the RZW Braking Resistors series. Used with drive controllers, the unit dissipates surplus kinetic energy from decelerating servo axes and prevents DC-bus overvoltage in automated machinery. The compact assembly mounts near the cabinet roof or on a machine frame and features wire terminals compatible with common control-panel wiring practices. Its placement allows the heat produced during braking to remain separated from sensitive drive electronics while keeping the electrical connection to the drive controller relatively short.
The resistor has a nominal power dissipation of 18.5 kW during each 120-second load cycle. The element provides a resistance of 18 Ω, while the connected drive requires a minimum resistance of 17.5 Ω to keep current within the braking transistor limits. For intermittent duty, the unit operates at a 40% cyclic duration factor. During each cycle, it may conduct for 48 seconds before cooling for 72 seconds. This operating pattern controls average heat accumulation within the resistor body. Screw lugs accommodate 10 mm² cable, allowing the conductors to carry braking current without excessive electrical losses. The specified cable size also provides a secure connection at the resistor terminals under repeated heating and cooling cycles.
The enclosure measures 395 mm wide, 490 mm deep, and 520 mm high, allowing installation in an auxiliary bay beside a drive stack. Its mass is 26 kg, so the mounting surface must provide adequate structural support. The IP23 housing protects against finger contact and water spray at limited angles, but the unit still requires indoor installation. Surface temperature may reach 80 °C at full load, so adequate clearance must be maintained around wiring and nearby components. A thermal time constant of 100 seconds indicates how quickly the resistor body responds to a change in thermal load. The unit can operate at up to 90% relative humidity. Its Design 1 enclosure channels vertical airflow through the resistor grid to support natural cooling.
