What this mains choke does in the drive circuit
The Siemens 4EU3022-0ER00-0AA0 is a three-phase mains choke (line reactor) designed for installation ahead of a variable frequency drive. It attenuates harmonics and limits current rise during commutation events, protecting the drive's DC bus capacitors and extending semiconductor life. The 0.34 mH inductance at 575 V AC, 60 Hz produces a 5% relative inductive voltage drop at the rated 116 A operational current, which is the standard sizing for general-purpose drive input filtering. The 129 A maximum current rating (Ithmax) at 60 Hz sets the thermal limit for continuous operation; the 116 A rated operational current (ILN) is the design point for the 5% voltage drop. For a 575 V class drive, this choke is sized for a motor load drawing roughly 100–110 A under full load — typical for a 75–90 kW induction motor on a 480 V system, or a 100–125 HP motor on a 575 V system. The 217 W copper loss plus 176 W iron core loss totals 393 W of heat to vent from the enclosure.
Mounting and integration constraints
The IP00 rating means this is an open-frame component — no enclosure, no finger-safe protection. The flat-type terminals accept bus bar or large-gauge ring-tongue lugs; plan for a 0.3 m width, 0.269 m height, and 0.221 m depth footprint on the backplate. Thermal class H insulation (180 °C continuous) allows the choke to run hot, but the 40 °C ambient rating means the 393 W total loss must be ducted out — forced ventilation is recommended in a sealed cabinet.