The Siemens 4EU5021-0AH10-0B is a three-phase commutating choke (line reactor) designed for use with converter drives, rated for 495 A continuous current with a 550 A maximum at 50 Hz and 380 V AC.
Thermal and connection details
Thermal class H per IEC 60085 allows a 180 °C hot-spot temperature, which combined with the 40 °C ambient rating and the combined coil and iron-core power loss of 1821 W (1270 W coil + 551 W iron) means the choke requires forced-air or natural-convection ventilation within the panel — factor the heat load into your enclosure thermal budget. Main circuit connections use flat-type terminals (bus-bar style), not screw-clamp or spring-cage — expect to land copper bus bars or crimp-on flat connectors, not ferruled wire. Physical footprint: 0.518 m wide × 0.565 m high × 0.318 m deep — verify back-panel space and door clearance before committing the layout.