Product Description:

The HNL01.1R-0540-C0094-A-480-NNNA is a three-phase mains choke produced by Bosch Rexroth Indramat for the HNL Mains Chokes series. Installed between facility power and a drive controller, it raises source impedance to reduce differential current spikes and lower harmonic distortion at the converter input. By smoothing line current and limiting inrush, the unit helps protect semiconductor switching devices and DC-bus capacitors in industrial automation cabinets. It is used on the line side of the drive rather than at the motor terminals, where the choke acts directly on the incoming supply waveform.

It is rated for 3 x AC 400 to 480 V, -15/+10%, 50/60 Hz, covering common low-voltage industrial supply networks. The enclosure has an IP10 protection rating, which shields against accidental finger contact while leaving airflow open for convection cooling. A filter stage with capacitors helps reduce high-frequency switching disturbances, and design version 1 identifies the winding and core arrangement used for this unit. The choke is intended for regenerative supply systems that return braking energy toward the mains.

Placed on the incoming side of the power path, the choke moderates abrupt current changes before they reach the converter front end. That added inductance helps keep input current more uniform during startup, deceleration, and other operating states in which the connected drive would otherwise draw sharply changing current from the supply. Because the device works as a passive line component, it provides input conditioning without added switching electronics or separate control logic. It also supports cleaner interaction between the plant supply and the drive system, reducing electrical stress on line-side power components and helping the cabinet power section operate more smoothly during changing load conditions. This placement is especially useful in cabinets that contain dynamic motion equipment and shared power distribution, where supply quality at the converter input has a direct effect on stable operation.