What this choke does in a converter circuit
The Siemens 4EU3622-0EA00-1BA0 is a 3-phase commutating choke for converters. Its 0.000098 H inductance at 405 A rated current and 750 V AC gives a 4 % relative inductive voltage drop at rated conditions.
Three current figures govern the fit. The 450 A maximum current is the thermal limit at 50 Hz. The 405 A rated current is the nominal operating current for the 4 % voltage drop. The 563 A peak current handles transient overloads.
Thermal management and enclosure requirements
Total power loss is 463 W — 293 W in the coil (copper losses) plus 170 W in the iron core (hysteresis and eddy-current losses). At 40 °C ambient, this heat must be removed from the enclosure. The thermal class H insulation (180 °C hot-spot) gives headroom, but the surrounding components and wiring must be rated for the radiated heat. Dimensions are 0.35 m wide × 0.321 m tall × 0.227 m deep — a substantial block that needs a dedicated mounting footprint and clearance for the flat-type terminals on the main circuit connections.