Product Description:

The HLR05.1W-54K0-N05R4-A-D7-NNNN is a braking resistor module produced by Bosch Rexroth Indramat as part of the HLR Brake Resistors series. Installed on the DC link of Rexroth drive systems, the unit converts surplus kinetic energy into heat whenever servo axes decelerate or lower regenerative loads. By providing a controlled dissipation path, it keeps the intermediate circuit voltage within safe limits and helps prevent overvoltage shutdowns in automated production lines.

The resistor element presents a value of 5.4 Ω, and this resistance sets the braking current and the thermal load that the housing must release. Under continuous operation, the assembly can dissipate 54 kW without exceeding its steady-state temperature rise, while at 650 V DC it supports a duty cycle of 70% and momentary peaks up to 78 kW. When the DC bus rises toward 820 V DC, the permissible duty cycle falls to 38% and short-term power can reach 124 kW. The module is designed for drives with a nominal link voltage of DC 750 V, so its ceramic elements, terminals, and insulation distances are suited to that working potential. A ±10% resistance tolerance is specified, which provides the allowable range for braking current and thermal calculations.

Thermal management and safe mounting are aided by the enclosure’s IP20 rating, which helps prevent finger contact while still allowing convection airflow. Surface temperature may climb to 150 °C, so the housing must be positioned with at least 200 mm of free space on every side. Its energy storage capacity is 6500 kWs, allowing absorption of long deceleration ramps before thermal saturation is reached. Installation uses a 25 mm² power conductor and supports cable runs up to 100 m, allowing flexible placement inside large control cabinets or on external panels without excessive voltage drop.