The Siemens SIDAC 4EU3052-0AK00-1BA0 is a 3-phase output reactor (output choke) rated for 400 V AC, 45 A maximum, with an inductance of 0.8 mH. It sits between the drive output and the motor cable, limiting the rate of voltage rise (dV/dt) and reducing capacitive charging currents in long cable runs. That keeps reflected-wave overvoltage from punching through motor winding insulation — a common failure in drives with IGBT switching frequencies around 1 kHz.
Rated for 45 A continuous, this reactor handles the full-load current of a 22–30 kW motor at 400 V, depending on the drive's duty cycle. The 0.8 mH inductance is sized for a 1 kHz switching frequency — the reactor core saturates if you push a significantly lower switching frequency at full current. IP00 means no enclosure — mount it in a clean, dry panel section, not in a washdown zone.
The reactor measures 0.3 m wide by 0.26 m tall by 0.21 m deep — a substantial block that needs a dedicated footprint on the panel backplate, not DIN-rail snap-on. Terminals are flat-type connectors for the main circuit, so expect bus-bar or heavy cable lugs. The 205 W coil loss plus 160 W core loss means the panel's thermal budget must account for 365 W of heat from this one component; keep it clear of heat-sensitive electronics and ensure airflow across the fins.