The Siemens 4EU3022-0EF00-0AA0 is a three-phase mains choke (line reactor) designed for the input side of variable frequency drives. It smooths current harmonics and limits inrush, protecting both the drive and the upstream supply. Rated for 400 V AC, it carries a maximum continuous current of 112 A and a rated current of 100.8 A at 50 Hz — the 6% voltage drop at rated conditions is the design target for typical drive input filtering.
The 100.8 A rated current (112 A max) tells you this choke is sized for a drive with a comparable input current rating — oversizing by more than a frame risks losing the harmonic attenuation, undersizing cooks the winding. The 0.395 mH inductance (0.0004 H) and 6% voltage drop are paired; a different impedance changes the filtering curve. Thermal class H (180 °C insulation) means the winding can survive sustained overloads that would cook a class B or F choke — relevant if your drive cycles hard or runs near a hot panel wall. IP00 means no enclosure — this choke mounts inside a cabinet, not in a washdown area. The flat-type terminals accept busbar or cable lugs; plan for a 0.3 m width and 0.221 m depth on the mounting surface.
This is a panel-mounted component, not DIN-rail. The 0.3 m width and 0.269 m height footprint needs a backplate or sub-panel; the 0.221 m depth projects into the cabinet, so check your enclosure depth before committing. Flat-type terminals suit busbar connection or ring-tongue lugs — no spring-cage or screw-clamp here. Mount it between the supply disconnect and the drive input; keep power wiring short to minimize radiated noise.