Product Description:

The HNL02.1R-0980-C0023-A-480-NNNN is a three-phase mains choke produced by Bosch Rexroth Indramat for the HNL Mains Chokes series. In regenerative drive panels, this component is wired in series with the supply conductors to limit inrush current, suppress harmonic distortion, and protect connected inverters and servo equipment from voltage spikes during startup and line disturbances. By providing controlled impedance ahead of the converter, it helps meet electromagnetic compatibility limits and extends the service life of filter capacitors and semiconductor switches during continuous industrial automation duty cycles.

The choke is rated for a 3 × AC supply and supports nominal line potentials between 400–480 V. Operation remains within tolerance when the grid deviates by –15/+10%, so the coil does not saturate during short undervoltage or overvoltage events that can occur on plant distribution systems. Frequency compatibility at 50/60 Hz allows the same unit to be used in installations that follow either IEC or NEMA mains standards without requiring a different choke for regional power frequency. Its laminated core sits inside a ventilated housing rated IP10, meaning solid objects larger than 50 mm are blocked while airflow remains unrestricted; this protection level is intended for mounting inside closed electrical cabinets where the surrounding enclosure provides additional shielding.

The unit is version 1 and matches drive families released alongside the initial HNL platform. This variant is equipped with capacitors that damp residual voltage peaks when regenerative power flows back toward the utility, which helps smooth electrical stress at the input side of the drive system. Because the supply topology is regenerative, the added capacitance improves energy absorption during dynamic braking without raising switching losses in normal operation. That arrangement is suited to axes that return energy to the mains through the connected converter during deceleration. It also helps stabilize line-side behavior during repeated acceleration and braking cycles.