Product Description:

The HNL01.1E-2800-S0125-A-480-NNNN is a mains choke produced by Bosch Rexroth Indramat within the HNL Mains Chokes series. Positioned on the supply side of drive systems, the unit raises network impedance to restrain harmonic distortion and reduce peak currents. It also helps shield frequency inverters from voltage transients that are common in industrial automation environments. By increasing line impedance ahead of the converter, it smooths the current drawn from the supply and reduces stress on upstream switching devices.

The choke connects to three-phase grids rated at 3 x AC 400–480 V -15/+10% and maintains stable performance across the full tolerance band. It is compatible with public and plant networks that operate at 50/60 Hz, which covers the standard utility frequencies used in most industrial installations. Internal windings use a current-compensated configuration, so the magnetic flux generated by balanced phase currents cancels and allows a compact package while still attenuating differential disturbances. With a housing rated IP10, the device helps protect against accidental contact with energized parts, but it still needs to be installed in a ventilated enclosure for additional protection. The unit is design version 1, which sets the terminal pitch, mounting hole spacing, and saturation behavior for this model.

The unit is part of Series 01 and is matched to the line impedance and inrush behavior used with the IndraDrive converter family. It is intended for a mains section that operates in a feeding topology. In this arrangement, excess DC-bus energy is handled by a braking path rather than returned to the utility line. Materials and process controls support predictable temperature rise and a linear inductance curve during operation. This helps limit nuisance breaker trips, reduce stress on motor bearings, and ease the load on upstream contactors without causing a large voltage drop.