Product Description:

The HLR01.2N-01K0-N28R0-E-007-NNNN is a brake resistor manufactured by Bosch Rexroth Indramat within the HLR Brake Resistors series. Installed on the DC link of a converter, it converts surplus electrical energy from decelerating servo motors into heat so the drive electronics remain within safe voltage limits. This component is intended for regenerative sequences in automated machinery where controlled braking helps prevent overvoltage trips and protects the power semiconductors. During repeated deceleration, it provides a dedicated path for returned energy instead of letting the DC bus rise too quickly.

The resistor can momentarily absorb up to 25.82 kW of braking power during rapid stops, while its long-term rating is 1.00 kW so continuous operation stays within its thermal capacity. A nominal resistance of 28.00 ohm produces the current level at a given DC bus voltage, which controls how quickly braking energy is dissipated. It is matched to systems whose intermediate circuit reaches DC 700 V, allowing energy transfer without exceeding the intended voltage range. An internal temperature switch rated at 6 A can disconnect the resistor if overheating occurs and can also provide a signal to the control system.

The aluminum housing carries an IP54 rating, which helps block dust and limited water spray and allows installation outside the main cabinet in suitable locations. With a mass of 3.96 kg, the unit remains manageable for panel mounting while still providing enough thermal mass for a maximum on-time of 1.16 s per braking event, followed by a minimum cycle interval of 33.30 s to cool back down. Natural convection removes heat, and the 295 mm width, 224 mm depth, and 255 mm height provide the surface area needed for passive dissipation. A pair of M6 mounting threads supports secure attachment, and AWG 16 leads simplify connection to the converter’s brake transistor. The design can store up to 30.00 kWs of regenerative energy before the required duty-cycle pause begins.