The Siemens 4EU3652-4UA00-1BA0 is a mains choke (line reactor) designed for installation ahead of a variable-frequency drive (VFD) — it limits harmonic distortion, reduces peak currents, and protects the drive's DC bus from line transients. Rated for 3-phase, 500V AC, 50 Hz, it carries a maximum current of 910A and a rated continuous current of 819A (cites:,).
The 910A maximum / 819A rated current tells you this choke is sized for a high-power VFD — think large conveyors, pumps, or compressor trains in the 400–500 kW range on 500V supply. The 0.02 mH inductance (20 µH) is low, which is correct for a high-current line reactor; the 2% voltage drop confirms it's a light-duty filter that won't starve the drive of voltage (cites:,). IP00 means it's an open-frame component — no enclosure, no finger-safe cover. The 394W coil loss plus 130W iron loss (524W total at full load) must be dissipated; factor that into your panel thermal budget (cites:,).
Dimensions are 0.35 m wide × 0.321 m tall × 0.237 m deep — roughly 14 × 12.6 × 9.3 inches — so it occupies a significant footprint in the cabinet (cites:,). Main circuit connections use flat-type terminals (bus-bar compatible), not screw clamps; plan for bolted lugs or bus-bar stubs (cites:). Listed to EN 61558-2-20 (safety of transformers, reactors, and power supply units) and UL/CSA recognized (cites:).