RZW03.1-007-025 Bosch Rexroth Indramat
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MPN: R911201139
The Bosch Rexroth Indramat RZW03.1-007-025 is a braking resistor from the RZW Braking Resistors series with a resistance of 33 Ohms and a power rating of 7.5 kW. The resistor is protected to IP23, weighs 26 kilograms, and measures 520 mm in height, 395 mm in width, and 490 mm in depth. It supports a maximum surface temperature of 80 degrees Celsius and can handle a load cycle of 120 seconds at 25 percent operating factor.
Internal Product Review
The RZW03.1-007-025 is a Bosch Rexroth Indramat RZW braking resistor with 7.5 kW power data and 33 Ω resistance. IP23 protection and a 25% operating factor support dependable braking duty in enclosed industrial installations. Strong thermal performance is a clear advantage, highlighted by an 80 °C maximum surface temperature.
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Product Description:
The RZW03.1-007-025 braking resistor is manufactured by Bosch Rexroth Indramat for the RZW Braking Resistors series. In a drive system, it converts the regenerative energy produced during motor deceleration into heat, allowing the connected inverter to keep the DC-bus voltage within safe limits and maintain controlled stopping cycles in industrial automation equipment. This model handles a peak dissipation of 7.5 kW, indicating the electrical power it can convert to thermal output during braking events.
Its fixed resistance of 33 Ω coordinates with the drive’s chopper transistor, while the minimum connectable resistance of 30 Ω sets the lower boundary for parallel wiring combinations. The enclosure meets IP23 protection, so falling water and particles larger than 12.5 mm do not interfere with operation. The housing measures 490 mm deep and 520 mm high, providing the clearance requirements for cabinet installation. An operating factor of 25% SD allows the resistor to conduct for one quarter of the duty period without exceeding its thermal limits. The load cycle is 120 seconds. The design 1 housing supports line leads up to 2.5 mm² and a ground conductor of at least 10 mm², which fasten to an M10 threaded stud.
The aluminum and steel assembly weighs 26 kg, so panel supports must accommodate that static load. A casing width of 395 mm combines with the depth to produce a low-profile footprint that fits under ducts or busbars. With a thermal time constant of 100 seconds, the element gradually approaches its maximum surface temperature of 80 °C, providing predictable cooling behavior during the stated load cycle. Installation requires ambient humidity below 90 percent to prevent condensation. Air must circulate freely around the enclosure so heat can dissipate without obstruction and the resistor can remain within its operating limits.
