Product Description:

The HLR01.2N-01KO-N28RO-E-007-NNNN brake resistor is produced by Bosch Rexroth Indramat within the HLR Brake Resistors series. It is intended for drive systems that regenerate excess kinetic energy during deceleration, and the resistor converts that energy into heat so the DC bus voltage of the servo inverter stays within safe limits. Used in material-handling axes, packaging machinery, and general motion platforms, the unit mounts outside the cabinet on a grounded backplate and works in conjunction with the drive’s transistor chopper to absorb short braking events.

The resistor element presents a nominal resistance of 28.00 ohms, ensuring predictable current draw from the intermediate circuit. During normal duty, it can dissipate 1.00 kW of heat continuously, while short transients are accommodated by a peak braking capacity of 25.82 kW. That burst rating aligns with a stored-energy figure of 30.00 kWs, meaning the device can accept 30 kilojoules before reaching its thermal limit. A bimetal contact opens at 6 A, allowing the drive controller to detect an overtemperature condition and shut down firing of the chopper. Cooling is done by natural convection, so airflow must remain unobstructed along the finned housing. The resistor body spans an overall width of 295.9 mm and attaches with M6 screws provided on the rear flange.

Thermal cycling restrictions limit the usable duty cycle. The maximum energized interval is 1.16 s, and each braking pulse must be followed by at least 33.30 s of recovery so internal temperature returns to a steady state. Following this timing, along with a minimum mounting clearance of 200 mm to surrounding surfaces, helps protect adjacent components from radiant heat. The enclosure carries an IP54 rating that blocks dust and splash ingress, extending service life in typical factory environments. At 3.96 kg, the module provides adequate thermal mass for the stated energy absorption without placing excessive load on the mounting surface.