Product Description:

The HNL05.1R-0125-N0152-N-A5-NNNN is a three-phase mains choke manufactured by Bosch Rexroth Indramat within the HNL Mains Chokes series. Installed between the facility supply network and an inverter or regenerative power module, the unit attenuates high-frequency components, limits inrush current, and reduces harmonics returned to the grid. In regenerative drive chains, it also smooths current flow so upstream protection gear experiences less thermal stress. By lowering voltage peaks at converter terminals, the choke extends the service life of power semiconductors and improves electromagnetic compatibility in factory automation lines. It is commonly used where drive systems draw pulsating current from the mains and where cleaner line behavior is needed around sensitive equipment.

Its nominal inductance is 125 µH, providing the impedance needed to oppose rapid current changes and filter line-side disturbances. A continuous current capacity of 152 A lets the choke pair with medium-power inverters without magnetic core saturation under steady load. The component is intended for AC operation and handles a 3-phase supply, so the inductive effect remains symmetrical across all conductors. Symmetrical impedance across the conductors helps keep phase currents balanced and reduces distortion seen by connected power electronics. With an enclosure classification of IP00, the choke must be mounted inside a protected electrical cabinet where accidental contact or liquid exposure cannot occur.

It is intended for connection to a regenerative supply system, so the magnetic design tolerates bidirectional energy flow during motor braking phases. The hardware corresponds to design version 1, indicating the mechanical footprint and terminal layout used throughout current HNL production. Cooling is entirely convection based because the product is built without liquid cooling, so cabinet ventilation must dissipate winding losses under the stated current rating. Because the unit relies on passive heat dissipation, surrounding clearance and airflow inside the cabinet directly affect temperature rise during continuous operation.