The Siemens 4EU4521-5BA00 is a 3-phase commutating choke (line reactor) for converter applications, rated 1000 A continuous with a 1250 A peak capability. Open-frame IP00 construction means it mounts inside a cabinet — no washdown or outdoor duty. The 488 W coil loss plus 404 W iron loss at 40 °C ambient need to be ventilated; class H insulation (180 °C) gives thermal headroom if the enclosure runs hot.
Integration notes
Footprint is 0.46 m wide by 0.435 m tall by 0.293 m deep. Flat-type terminals for the main power circuit accept busbar or lug connections — no ring terminals. Mount it on a panel backplate with clearance for airflow around the core; the combined 892 W dissipation (coil + iron) needs forced ventilation in a sealed cabinet. Operating frequency is 50 or 60 Hz; the inductance value is specified at the rated current and frequency, so verify harmonic content if the drive uses a high pulse number.