Product Description:

The HNL01.1E-0038-N0650-N-690-NNNN is a three-phase mains choke produced by Bosch Rexroth Indramat in the HNL Mains Chokes series. It is installed between the incoming utility line and a compatible inverter or servo drive, where it adds inductance ahead of the drive’s rectifier stage. This helps smooth the current drawn from the supply, reduces line-side stress during rapid load changes, and lessens the sharp peaks that can occur when DC bus capacitors charge. In automated systems with repeated acceleration and deceleration, that behavior supports more stable input conditions for the connected power electronics.

The unit has a protection rating of IP00, so it is intended for protected cabinet installation rather than open mounting on the machine. Because the enclosure does not provide touch protection by itself, shielding from dust and accidental contact must come from the surrounding control cabinet. Its insulation is suitable for a supply range of 3 x AC 380 V -15% to 3 x AC 690 V +10%, which covers a broad span of three-phase mains systems used in industrial panels. The product is listed as Design Version 1, and it is used in a feeding topology upstream of the DC bus capacitor so the line current is conditioned before it reaches the drive input stage.

The unit is identified as Series 01, which places it within the first series designation for this design. Its main purpose is to raise line-side impedance so the connected drive draws current more smoothly and returns fewer disturbances to the plant supply. By limiting harmonic currents and reducing switching transients at the input, it helps protect rectifier sections and supports cleaner electrical conditions in shared cabinets. This line-side placement also means its effect is directed at incoming power quality rather than motor cable behavior or output waveform shaping.