Product Description:

The HNL01.1R-0035-N1200-A-480-NNNN is a three-phase mains choke built by Bosch Rexroth Indramat for the HNL Mains Chokes series. Positioned between the facility service transformer and regenerative drive inverters, it adds series inductance that limits current peaks, reduces harmonic distortion, and helps protect power modules from commutation spikes. During motor braking, the choke smooths the waveform returned to the grid so line-side stress is reduced and power quality remains more stable. This operating role makes it suitable for automation systems that use regenerative drive technology and repeatedly cycle between acceleration and deceleration.

The enclosure is rated IP10, so it prevents accidental finger contact but should be installed inside a ventilated cabinet. The unit is supplied as design version 1, which identifies the released build of this product. Its line connection is rated for 3 x AC 400–480 V -15/+10%, which matches common industrial mains with normal voltage variation. Because it is intended for a regenerative mains supply, the choke can handle bidirectional energy flow during motoring and braking without magnetic saturation. The open enclosure style also means the unit is intended for protected indoor installation rather than direct exposure to dust or liquid.

In control cabinets, the inductance works with the DC link to moderate line current at 50/60 Hz. The suffix 01 identifies the inductance class within the family. A standardized coil geometry provides the required impedance while keeping winding temperatures within thermal class limits during normal operation. This helps reduce current ripple on the supply side when connected converters return braking energy to the mains. The result is smoother line behavior during repeated machine cycles that include frequent deceleration.