RZW02.1-315-025 Bosch Rexroth Indramat
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The Bosch Rexroth Indramat RZW02.1-315-025 is part of the RZW Braking Resistors series and delivers a power rating of 315 kW with a resistance of 2 x 2.4 ohms. This braking resistor features two brake choppers, has an IP20 protection class, and a maximum surface temperature of 80 degrees Celsius. The unit also offers a line cross-section of 70 mm² and a thermal time constant of 100 seconds.
Internal Product Review
The RZW02.1-315-025 is a Bosch Rexroth Indramat RZW braking resistor rated for 315 kW with IP20 protection. Dual brake choppers and 2 x 2.4 Ω resistance support controlled energy dissipation, making the unit a strong choice for high-demand drive braking applications.
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Product Description:
The RZW02.1-315-025 braking resistor assembly is produced by Bosch Rexroth Indramat for the RZW Braking Resistors series. Classified with design code 1 and auxiliary function W1, the unit installs next to Rexroth drive controllers and operates with two integrated brake choppers so regenerated motor energy is converted into heat. This arrangement keeps the DC-link voltage within safe limits when large axes decelerate, protecting drive systems used in presses, gantries, and high-inertia machine tools.
The resistor bank can absorb up to 315 kW of instantaneous electrical power, which is the highest braking load it can tolerate without damage. Its nominal resistance is 2 × 2.4 Ω; two equal branches share the current so each brake chopper receives the proper load. Continuous duty is limited to an operating factor of 25% SD, meaning a full-power braking pulse may occupy one quarter of a repeating cycle to prevent overheating. The aluminum housing has an IP20 protection rating, allowing cabinet installation while preventing accidental finger contact with internal parts. Main supply conductors have a cross-sectional area of 70 mm², and a ground conductor with a minimum cross-sectional area of 10 mm² connects the frame to the system ground for fault-current protection. A thermal time constant of 100 s indicates how quickly the resistor approaches thermal equilibrium after power is applied or removed. This value can be used when configuring sequential braking events and calculating the necessary cooling periods between high-energy deceleration cycles.
For applications that require lower resistance, the drive can connect a minimum load of 2 × 2.2 Ω, provided that the system current limits are observed. When several resistors are connected in parallel, a reduction factor of 3.2 scales the permissible cycle energy so that each unit remains within its thermal limits. The surface temperature may reach 80 °C at the stated duty cycle, so adjacent components must be suitable for elevated heat. Cabling should be positioned away from direct contact with the cooling fins to reduce the risk of insulation damage. Adequate cabinet clearance should also be maintained around the resistor housing so heat can dissipate without exposing nearby equipment to excessive temperatures.
