The Siemens SIDAC 4EU3031-2UA00-0A is a 3-phase output reactor rated for 460 V AC. It handles a maximum AC current of 370 A at 120 Hz, with a rated operational current of 333 A. The 0.011 mH inductance (1.1E-5 H) and 1.15 % impedance (UK) are sized to limit voltage spikes and reduce harmonic distortion on the motor cable — a common need on long drive-to-motor runs where reflected wave events can punch through winding insulation.
The 370 A maximum at 120 Hz is the thermal limit under worst-case switching conditions; the 333 A rated current is the continuous duty figure you size the drive against. Both exceed what a typical 200–250 HP drive would pull, so this reactor pairs with a large-frame VFD driving a motor on a conveyor, pump, or fan. The 3 kHz switching frequency (F TAKT) matches the carrier frequency of many modern PWM drives — if your drive runs a higher carrier (4–8 kHz), you need to check the derating curve because the iron-core losses climb with frequency. The IP00 enclosure means it has no drip shield or finger guard; it mounts inside a cabinet, not on the wall or in a washdown area. Flat-type terminals accept busbar or large cable lugs — plan for a bolted connection, not a spring clamp.
Thermal class and power loss
Total power loss is 385 W — 205 W in the coil and 180 W in the iron core. At a 40 °C ambient, the thermal class H insulation gives a 180 °C hot-spot limit, so the reactor can sit in a warm cabinet without forced cooling as long as the enclosure has enough natural convection. Dimensions are 0.3 m wide × 0.26 m tall × 0.21 m deep — plan for a footprint roughly the size of a shoebox, mounted on a flat panel or subplate, not a DIN rail.