The Siemens SIDAC 4EU2531-3UA00-0A is a 3-phase output reactor — a choke placed between a variable-frequency drive and the motor to smooth the PWM waveform and limit voltage spikes from long cable runs. It is rated for a maximum continuous current of 146 A at 120 Hz and a rated operational current of 131.4 A, with an inductance of 0.03 mH (30 µH). The switching-frequency rating of 3 kHz tells you the reactor is designed for drives running a typical IGBT carrier frequency up to that point; above that, core losses climb and the filtering effect degrades. The 460 V line-to-line voltage rating (from the description field) and Class H insulation (thermal class per IEC 60085) mean the winding insulation withstands sustained temperatures up to 180 °C, with a 40 °C ambient rating. Total power loss at rated load is 221.5 W — 123 W in the coil and 98.5 W in the iron core — so the panel needs to move that heat out; IP00 open-frame construction means it is intended for enclosure mounting with forced or natural ventilation, not standalone outdoor use.
This reactor mounts in the motor branch circuit, downstream of the drive output and upstream of the motor. The flat-type terminals accept bus-bar or lug connections, typical for panel builds at this current level. Dimensions are 0.22 m wide by 0.21 m tall by 0.16 m deep — roughly 9 by 8 by 6 inches — so it occupies a significant footprint on the backplate; plan the gland plate and cable routing accordingly.
The reactor is recognized under UL and CSA standards, tested to EN 61558-2-20 (safety of transformers, reactors, and power supply units). This covers the essential safety and flammability requirements for industrial control panels in North American and European installations.