The Schneider Altivar VW3SKLN009H004 is a 3-phase line choke (line reactor) rated for 9 A continuous current with 4 mH inductance, designed for use with Altivar variable speed drives to reduce current harmonics on the input side. It operates on 50-60 Hz line supplies and is sized for drives in the 9 A class — typically matching a 4 kW motor at 400 V three-phase.
Sourcing Reality — Obsolete Status
The 9 A rated current is the continuous thermal rating at the choke's nominal temperature rise — it governs the maximum drive input current the choke can handle without saturating or overheating. For a 4 kW drive on 400 V three-phase, this is the correct size. The 4 mH inductance value determines the impedance at 50/60 Hz, which sets the harmonic attenuation level. Higher inductance gives better filtering but increases voltage drop and physical size — 4 mH is a standard value for this drive class. As a 3-phase line choke, it mounts in the drive's input path between the mains supply and the drive rectifier. Panel builders typically install it on DIN rail or a mounting plate near the drive.