Product Description:

The HNL01.1E-0571-N0050-A-500-NNNN is a three-phase mains choke manufactured by Bosch Rexroth Indramat in the HNL Mains Chokes series. It works as a passive reactor installed between the plant utility feed and the input rectifier of a drive system. By increasing line impedance, it reduces harmonic content and limits surge current into sensitive power electronics. The reactor also slows the rate at which current rises at the rectifier input, which helps reduce peak charging current into DC bus capacitors. In automated production lines, this conditioning supports electromagnetic compatibility with neighboring equipment and reduces abrupt current pulses on shared power lines.

The choke accepts 3 × AC 380–500 V and remains functional across a -15/+10% supply range, so normal utility variation does not prevent intended line conditioning. Support for 50/60 Hz allows the same unit to operate on either common mains standard. The housing has an IP10 rating, which helps prevent accidental contact with energized parts but still requires installation inside a control cabinet. Because the unit is open in this protection class, the surrounding enclosure must provide shielding from dust, debris, and unintended contact. The product is in design version 1 and series 01, which identify this configuration within the product line.

Within a feeding supply system, the choke is installed on the grid side rather than at the motor output. Because it reacts to line current instead of motor-side transients, its thermal behavior stays steady when several inverters share the same incoming supply. That position makes it suitable for drive groups where line behavior needs to remain predictable as machine demand changes. This order code is supplied as a fixed configuration, so the electrical characteristics remain consistent across distributed variable-frequency drive panels. The unit is intended for line conditioning and input protection, not for motor switching or output filtering.