The Siemens SIDAC 4EU4521-0BS00-4B is a 3-phase output reactor rated for 480 V AC with a maximum continuous current of 120 A and an inductance of 0.0002 H. It sits between a drive and motor, smoothing PWM edges and limiting voltage rise rate on long cable runs.
The 8 kHz switching frequency rating matches typical IGBT carrier frequencies. The 0.0002 H inductance and 76% impedance limit motor-terminal overvoltage on long cable runs. IP00 means it's an open-frame component — no drip shield, no enclosure. It belongs in a ventilated cabinet, not on the plant floor exposed to washdown or dust. The Class H insulation (180 °C thermal class per IEC 60085) gives headroom for the 184 W coil loss and 445 W iron-core loss at the rated 40 °C ambient. Flat-type terminals for the main circuit mean the connection is a bus-bar or heavy-crimp lug interface, not a spring-cage or screw-clamp. Factor that into your panel wiring plan — you'll need the right crimp tool and clearance for the lug stack height.