Product Description:

The RZW03.1-045-025 braking module is produced by Bosch Rexroth Indramat for the RZW Braking Resistors series. As a dynamic braking resistor, it connects across the DC link of Rexroth drive converters to dissipate regenerative energy that appears when servomotors decelerate or lower loads. The unit uses Design 1 and measures 795 mm in width, 490 mm in depth, and 520 mm in height, allowing it to mount alongside drives inside a common enclosure without exceeding typical cabinet footprints.

Its energy-handling capacity includes continuous absorption of 45 kW at a cold resistance of 7.3 Ω. Drive systems with lower impedance may be used as long as they do not drop below the 6 Ω minimum permitted by the series. Intermittent duty uses an operating factor of 25% SD within a repeating period of 120 s. The aluminum core therefore heats for a limited interval before cooling, behavior that corresponds to the 100 s thermal time constant. The IP23 protection rating permits installation in ventilated rooms and provides protection against water spray at angles up to 60 degrees from vertical. Bosch Rexroth recommends a conductor cross-sectional area of 25 mm² so the DC wiring remains within its permitted temperature rise while transferring peak currents to the resistor grid.

Installation uses an M10 mounting thread, and the assembly weighs 51 kg, which should be considered when selecting panel reinforcement. During braking, the finned surface can reach 80 °C, so adjacent components must have sufficient clearance from the module. Control logic must limit each energized interval to a maximum of 30 s and provide a cooling period of 90 s before the next braking event, in accordance with the product’s load cycle.