Product Description:

The HLR01.1N-03K8-N40R3-A-007-NNNN brake resistor is produced by Bosch Rexroth Indramat and belongs to the HLR Brake Resistors series. In an inverter-based axis, this component converts surplus kinetic energy from the motor into heat so the DC bus voltage remains within safe limits during rapid deceleration or load overrun. By providing a controlled energy sink, it protects the power electronics and maintains the dynamic braking capability required for servo drives and positioning stages in industrial automation. It is installed outside the drive cabinet or on top of it, depending on thermal layout constraints.

In continuous operation, the resistor can dissipate 3.8 kW, which is the average heat it can release without exceeding its temperature class. The element impedance of 40.3 Ω sets the braking current when it is connected to the common DC link, allowing the resistor to be matched to the drive’s nominal voltage. For short regenerative events, it tolerates a peak load of 18 kW, but this overload is limited to 16.7 s per cycle, after which cooling must restore the base temperature. This operating profile keeps the allowable duty cycle within the thermal envelope and helps prevent damage to the wire-wound element or its enclosure.

The total energy that may be absorbed during one braking interval is 300 kWs, so motion sequences with large inertial dumps must stay within this capacity. With a housing width of 490 mm, the unit occupies moderate panel space and leaves clearance for airflow along its fins. The design is identified as resistor type B, indicating compatibility with Rexroth drives that monitor temperature through an external sensor lead. Effective heat dissipation occurs through natural convection across the ribbed aluminum body, eliminating the need for forced cooling hardware.