The Siemens 4EP4000-1US00 is a 3-phase AC mains choke (line reactor) sized for variable-frequency drive input filtering. It's rated 500 V operating voltage, 80 A maximum AC current, with 0.23 mH inductance and a 2% relative inductive voltage drop at rated current and frequency. The 71.7 W coil loss and 24.2 W iron core loss add up to about 96 W total heat to vent in the enclosure. Thermal class B (130 °C rise) per IEC 60085 means it's standard industrial grade — fine for a 40 °C ambient, but push the ambient higher and you'll need to derate or add airflow.
IP00 means no enclosure — this choke mounts inside a cabinet. The flat-type terminals for the main circuit accept busbar or cable lugs. Dimensions are 0.219 m wide × 0.179 m high × 0.143 m deep.