Product Description:

The HNL01.1E-0400-N0051-A-480-NNNN is a three-phase line choke produced by Bosch Rexroth Indramat for the HNL Mains Chokes series. Installed upstream of frequency converters, it raises network impedance, lowers total harmonic distortion, and limits transient overcurrents during switching. By smoothing the current drawn from the utility, the choke protects drive rectifiers and helps prevent voltage dips that could trip sensitive automation equipment. This placement also supports more stable input conditions for the converter during rapid load changes.

This model is intended for three-phase plants that operate on 3 x AC 400 – 480 V -15/+10%, 50/60 Hz. At that range, the choke presents a nominal inductance of 400 µH, which sets the impedance seen by the supply at the fundamental frequency and directly affects harmonic attenuation. When fully loaded, it carries 51 A rms current, so cable cross-sections and protection devices must be sized for continuous conduction. The core and winding assembly are housed in an enclosure with an IP10 degree of protection, which guards against accidental contact with live parts but does not seal against dust or water. The device is intended for a feeding supply system, so it is installed on the line side of the converter rather than in the motor circuit.

The choke follows design version 1, which aligns its footprint and terminal geometry with related units from the same release. The product is in series 01. This configuration uses standard copper bus terminals and a plain accessory plate. These features support straightforward panel integration and keep line connections easy to access inside an enclosed cabinet. The terminal arrangement also helps maintain an orderly layout where incoming supply conductors must be routed cleanly to the converter input.