The Siemens 4EU3622-0EL00-1BA0 is a commutating choke for converter applications — a 3-phase AC line reactor rated for 600 V operating voltage and 50 Hz. It handles a maximum continuous current of 825 A, with a rated current of 743 A, and also carries a DC rated value of 1 011 A. The inductance is 0.0208 mH (20 µH), and the relative inductive voltage drop at rated conditions is 1.55%. This is the component that limits di/dt and smooths commutation notches on the line side of a large thyristor or IGBT converter, protecting both the converter semiconductors and the upstream transformer.
This is a panel-mount component — no DIN rail, no snap-on. The enclosure is IP00 (open frame), so it needs to live inside a cabinet with its own ventilation or forced-air cooling. The main current circuit connects via flat-type terminals (bus-bar style), which means you're bolting copper bars or heavy cable lugs directly to the choke. Dimensions are 0.35 m wide by 0.321 m tall by 0.227 m deep — about the size of a small suitcase. Plan for at least 100 mm clearance around it for airflow and safe access.
Thermal class and ambient limits
Rated ambient temperature is 40 °C, with thermal class H per IEC 60085 — that means the insulation system is rated for a 180 °C hot-spot temperature. In practice, if your cabinet ambient runs above 40 °C, you'll need to derate the current or add forced cooling. The IP00 rating means no dust or splash protection; keep it in a clean, dry enclosure.