The Siemens SIDAC 4EU4521-0BV08-0B is a 3-phase output reactor rated for 110 A continuous at a switching frequency of 8 kHz, with 0.6 mH inductance per phase. It sits between the VFD output and the motor leads, smoothing the PWM waveform and limiting the voltage rise rate (dV/dt) that can cause premature motor insulation failure on long cable runs. The 400 V AC rating and Class H thermal insulation (180 °C) mean it handles the reflected-wave stress common in drives feeding motors more than 30 meters away.
The 110 A maximum at 8 kHz switching frequency is the key fit parameter — it tells you the reactor is sized for a drive output stage that switches at that carrier frequency. If your drive runs at a higher switching frequency, the core losses increase and you may need to derate the current. The 0.6 mH inductance is a moderate value, typical for general-purpose motor protection on 400 V systems. It limits the peak-to-peak ripple current but doesn't add excessive voltage drop at the motor terminals. IP00 means this is an open-frame component — no enclosure, no drip shield. It's intended for mounting inside a cabinet where the ambient temperature stays at or below 40 °C, as stated in the rating. The flat-type terminals accept busbar or large cable lugs; plan for a panel-mount bracket since there's no DIN-rail clip.