The Siemens 4EU3622-1DA00-0AA0 is a three-phase commutating choke — a line reactor — designed to sit between a converter (VFD or DC drive) and the AC supply. Its job is to limit current rise during commutation, reduce harmonic distortion, and protect the converter's input diodes from voltage notching and transient spikes. Rated for 690 V AC at 50/60 Hz, it handles a maximum continuous current of 355 A and a rated current of 319.5 A, with a peak current capability of 444 A. The inductance is 0.1 mH (0.103 mH per the description), and the relative inductive voltage drop at rated conditions is 4%. Total power loss breaks down as 320 W in the coil and 180 W in the iron core, for a combined 500 W at rated load and 40 °C ambient. The thermal class is H (IEC 60085), meaning the insulation system can handle 180 °C hot-spot temperatures — important for sustained high-current duty in a confined panel.
This is an open-frame choke, IP00 — no enclosure. It mounts via its own chassis (footprint 0.35 m wide × 0.321 m tall × 0.227 m deep) and terminates through flat-type connectors for the main circuit. Plan for a dedicated mounting plate or sub-panel; it's not a DIN-rail snap-on part. Because it's IP00, it needs to live inside a cabinet that provides the environmental protection. The flat-type terminals accept busbar or cable lugs — no screw-clamp blocks. Leave adequate clearance around the choke for airflow; 500 W of heat at full load needs to get out.
The choke carries UL/CSA recognition per EN 61558-2-20, so it's accepted in North American panels without a separate evaluation. The description also notes compliance with that standard's construction and testing requirements.