The Siemens 4EU3621-0AV00-0A is a 3-phase commutating choke for converter applications, rated for 389 A continuous with a 432 A maximum at 60 Hz. It operates at 400 V AC, 50–60 Hz, and delivers 0.14 mH inductance with an 8% relative inductive voltage drop at rated current. That 8% drop is the key sizing figure — it limits the di/dt on the converter's semiconductors, so the choke must match the drive's switching frequency and current ripple requirements. The IP00 open-frame construction means it's intended for enclosure mounting, not standalone floor placement. Thermal class H (180 °C) insulation and a 55 °C ambient rating give it headroom in warm cabinets.
Dimensions are 0.35 m wide × 0.321 m high × 0.237 m deep — a substantial block that needs a dedicated mounting plate or chassis rail, not a standard DIN rail. Main circuit connections are flat-type terminals, so plan for busbar or cable lugs with the correct hole pattern. The IP00 rating means it's open to dust and touch; the enclosure must provide the required ingress protection for the final installation.
Total power loss at rated load is 788 W — 528 W in the coil and 260 W in the iron core. That's significant heat to vent; the enclosure must have forced-air cooling or sufficient natural convection clearance. The thermal class H winding (180 °C) provides a safety margin, but the 55 °C ambient limit means derating above that temperature is required.