Product Description:

The HNL05.1R-0175-N0471-N-A5-NNNF is a mains choke produced by Bosch Rexroth Indramat within the HNL Mains Chokes series. It is intended for cabinet integration in high-current drive systems, where a line-side inductor is installed between the plant supply and the converter front end. In that position, the choke smooths input current, helps reduce harmonic content on the incoming line, and limits electrical stress on upstream components during dynamic drive operation. This role is especially useful in installations with large converters that draw rapidly changing current from the mains.

This unit is designed for a three-phase input of 3 x AC 525–690 V (-15/+10%), and it provides a nominal inductance of 175 µH across that operating range. That inductance helps limit current rise at the converter terminals, which reduces peak current demand and supports cleaner electromagnetic behavior on the supply side. The winding supports a continuous load current of 471 A for use with high-power inverters under sustained demand. Heat is removed by liquid cooling through internal coolant passages, and the open-frame assembly has a protection rating of IP00, so it must be installed inside a guarded cabinet. The exposed construction also means the unit depends on the enclosure for protection against accidental contact and airborne contamination.

The choke is matched for regenerative operation, making it suitable for systems that return energy to the supply during braking or overhauling conditions. Core and copper losses amount to 1500 W under rated conditions, while the coolant circuit can remove up to 2300 W of heat to keep internal temperatures under control during continuous operation. Because the component is part of the input stage rather than the motor circuit, its thermal and magnetic behavior directly affects how the front end interacts with the utility source. This unit is built as design version 1 in the series, and its layout is intended for fixed cabinet mounting with protected access to energized parts and cooling connections.