Product Description:

The HNL01.1D-0400-S0126-A-480-NNND is a line reactor manufactured by Bosch Rexroth Indramat as part of the HNL Mains Chokes series. Installed between the three-phase supply and an inverter or regenerative drive, the choke adds series inductance that limits di/dt, reduces harmonic distortion, and moderates inrush current. In industrial automation cabinets, it protects both the upstream grid and downstream power modules, helping reduce electromagnetic interference and extend the life of DC-link capacitors. By smoothing current transients at the mains input, it also helps the connected drive operate with less stress during acceleration and deceleration.

The device has a nominal inductance of 400 µH, providing impedance that filters high-frequency components flowing to and from the converter. It is specified for 3-phase AC 400-480 V (-15/+10 %) at 50/60 Hz, so it matches common plant voltages in North American and European facilities without tap changes. The enclosure meets IP10 protection, which means live parts are guarded against accidental finger contact and the unit is intended for installation inside a control cabinet. Because the enclosure is not sealed against dust or water, it is normally mounted in a protected electrical enclosure rather than on an exposed machine surface. This unit is design version 1, indicating the first mechanical and electrical iteration in the product line. The magnetic core is wound as a current-compensated pair, and equal and opposite flux from the forward and return conductors raises differential impedance while leaving common-mode noise largely unaffected.

The choke is rated for feeding and regenerative duty, so thermal sizing remains appropriate whether power is drawn from the supply or returned to it. This operating arrangement is useful where the same power hardware must handle both motoring and braking intervals during cyclic motion. It is grouped under series code 01, which helps keep physical dimensions and terminal layouts consistent within the range. In power-reversing drive systems, the added inductance helps stabilize the DC-link voltage during fast torque changes and reduces distortion at the point of common coupling.