The Siemens 4EU2722-4AA08-0AA3 is a three-phase commutating choke designed for converter applications — it limits the rate of current rise during commutation, protecting the converter's semiconductor switches from di/dt stress. Rated 225 A continuous (250 A max) at 400 V AC, 50 Hz, with an inductance of 0.1 mH and a relative inductive voltage drop of 4%. Thermal class H (180 °C) per IEC 60085 means the winding insulation holds up in high-ambient environments up to 40 °C rated ambient.
Enclosure dimensions: 0.27 m wide × 0.248 m high × 0.187 m deep. Main circuit connection uses flat-type terminals; plan for crimp lugs or bus-bar interface. The 225 A rated current is the continuous AC figure; note the DC rated value is 306.3 A if your converter line-up runs on a DC link.