RZW02.1-003-025 Bosch Rexroth Indramat
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MPN: R911200193
The Bosch Rexroth Indramat RZW02.1-003-025 is part of the RZW Braking Resistors series and has a power rating of 3 kW and a resistance of 68 Ohms. With a protection class of IP20, it features a width of 686 mm, a height of 120 mm, and weighs 3.4 kilograms. The resistor supports a maximum on time of 30 seconds, a maximum off time of 90 seconds, and has a thermal time constant of 300 seconds.
Internal Product Review
The RZW02.1-003-025 is a Bosch Rexroth Indramat RZW braking resistor rated for 3 kW with 68 Ω resistance. IP20 protection and a 25% duty cycle support dependable braking performance in controlled industrial installations. A 300 s thermal time constant adds valuable thermal stability, making this resistor a strong choice for dynamic drive systems.
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Product Description:
The RZW02.1-003-025 braking resistor is produced by Bosch Rexroth Indramat and belongs to the RZW Braking Resistors series. This resistor module attaches to the DC link of servo inverters and converts surplus kinetic energy into heat during rapid stops, preventing bus overvoltage events. Because braking energy is released outside the motor and inverter power stage, the drive can maintain controlled stopping behavior during repeated deceleration events. Within industrial automation, it enables short deceleration times and protects power electronics when axes reverse or masses are lowered. The unit interfaces with drive controllers that possess internal chopper switches, giving machine builders a compact, panel-mount energy dissipation element.
Under peak load, the module can absorb 3 kW of power, but it must follow a duty cycle with an operating factor of 25% SD; only a quarter of each cycle may be energized to keep the film elements within limits. The maximum energized period is 30 s, after which a recovery pause of 90 s is required so internal temperature returns to a safe level. This operating pattern suits applications that brake hard for short intervals rather than systems that dissipate energy continuously. Protection class IP20 indicates finger-safe grilles without moisture sealing, so installation is expected inside a switch cabinet with forced airflow. The resistor connects on line 2, and its terminals accept a 2.5 mm² conductor cross-section for straightforward wiring to drive output blocks.
The ohmic value of 68 Ω lets the chopper transistor divert current without exceeding its switching rating, while a minimum external resistance of 30 Ω allows multiple modules to be paralleled if lower total resistance is needed. A thermal time constant of 300 s describes how long the housing takes to reach 63% of its final temperature, supporting the stated duty factor. Mechanically, the aluminum profile is 92 mm deep, 120 mm high, and 686 mm wide, yielding an elongated form that promotes airflow across the fins. The housing shape also spreads heat across a broad surface during intermittent braking cycles. Total mass is 3.4 kg, and the design 1 construction matches the RZW product group numbering scheme.
