RZW03.1-004-025 Bosch Rexroth Indramat
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The Bosch Rexroth Indramat RZW03.1-004-025 is a braking resistor from the RZW Braking Resistors series with a resistance of 47 Ohms and a peak power of 3.5 kW. This 7 kilogram resistor features an IP23 protection class, a load cycle of 120 seconds, and dimensions of 335 mm by 230 mm by 182 mm. It includes an operating factor of 25 percent and uses M5 mounting threads.
Internal Product Review
The RZW03.1-004-025 is a Bosch Rexroth Indramat braking resistor rated at 4 kW with 47 Ω resistance. IP23 protection and a 25% operating factor give the unit a well-balanced profile for dependable braking duty. A 150 s thermal time constant complements the 3.5 kW peak power, making this resistor a strong choice for controlled energy dissipation.
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Product Description:
The RZW03.1-004-025 braking resistor is produced by Bosch Rexroth Indramat for the RZW Braking Resistors series. In automated plants, it is wired across the DC bus of an inverter so that surplus kinetic energy is converted into heat, preventing overvoltage events during rapid motor deceleration. An IP23 housing blocks solid objects larger than 12.5 mm and angled water spray, making the device suitable for cabinet interiors with controlled airflow.
This unit can dissipate up to 3.5 kW of peak power during a regenerative event, while its continuous power rating is 4 kW when the required cooling conditions are met. The element resistance is 47 Ω, and drives with DC bus values that require lower impedance can use additional modules as long as the total resistance remains at or above the 30 Ω minimum. Operation is based on a duty cycle of 25% SD. The 120 s cycle allows a maximum on-time of 30 s followed by an off-time of 90 s, keeping the surface temperature within the limits associated with the 150 s thermal time constant. Power is supplied through two screw terminals sized for 2.5 mm² conductors. The aluminum case is tapped for M5 hardware, allowing it to be fastened directly to a panel or heat sink plate, and this mounting arrangement is identified as Design 1.
The rectangular body stands 335 mm high, is 230 mm wide, and measures 182 mm deep, allowing installation beside standard frequency converter stacks without exceeding typical enclosure depths. A mass of 7 kg provides thermal inertia that helps moderate temperature peaks while permitting manageable installation and maintenance handling. Two external terminals simplify wiring checks, while the conductor cross-section limit helps maintain low connection resistance and reduces the risk of hot spots when the module dissipates its rated load.
