The Siemens 4EU2722-8BA00-0AA0 is a 3-phase commutating choke for converter drives, rated 400V AC at 50Hz. It carries 315A AC continuous (ITHMAX) or 386A DC, with an inductance of 66µH and a 4% relative inductive voltage drop at rated conditions. This is the line reactor that sits between the drive's DC link and the inverter stage — it limits current rise during commutation, reduces harmonics, and protects the converter's semiconductor switches.
Mounting is open-frame (IP00), so it goes inside a cabinet — not on the panel door or in a washdown zone. Dimensions: 0.270m wide × 0.248m high × 0.187m deep. Connections are flat-type terminals sized for the 315A current path; expect busbar or large-gauge cable lugs. Thermal class H (180°C) insulation per IEC 60085 means it can run hot in a sealed enclosure, but the 174W copper loss plus 75W iron loss (249W total at rated load) needs to be vented — don't bury it in a tight compartment without airflow.