Product Description:

The HNL01.1E-0370-N0125-A-480-NNNN mains choke belongs to the HNL Mains Chokes series manufactured by Bosch Rexroth Indramat. Installed between the plant supply and frequency converters, the unit limits inrush current and attenuates harmonics so connected drives see lower peak stress and reduced electromagnetic interference. It also improves the displacement power factor of the upstream network by adding inductance that smooths current waveforms during motor acceleration and regenerative braking. By reducing the steepness of current draw at the converter input, it helps moderate stress on upstream switching devices and line components. This behavior is useful where multiple drives share a common supply and line quality must remain more stable during changing load conditions.

Its enclosure has a protection rating of IP10, which means the windings are guarded from large objects while still allowing ventilation for natural cooling. The open housing also allows heat from the winding and core to dissipate without auxiliary fans or liquid circuits. The choke is released as design version 1, which identifies the first mechanical layout for this unit. For electrical compatibility, the terminals accept a mains connection of 3 x AC 400–480 V -15/+10%. The unit also supports a line frequency of 50/60 Hz, allowing use on common industrial utility systems and accommodating either standard utility frequency.

The choke is configured for a Feeding supply system, so it is installed on the input side of the inverter rather than in the DC link. Because of this placement, it conditions incoming power before the rectifier stage and helps shape the current drawn from the line. Within the HNL family, it is listed as Series 01, grouping it with devices that share the same general inductance class and thermal range. The unit is supplied without optional add-ons such as temperature sensors or surge arresters.