The Siemens SIDAC 4EU3931-6AA00-0A is a 3-phase filter reactor — a line reactor, really — rated for 353 A continuous with a 392 A maximum, at 600 V AC and 50 Hz. Inductance is 0.12 mH.
IP00 open-frame construction — no enclosure, no gaskets. This is a panel-mount component that expects a clean, dry electrical room. Dimensions are 0.41 m wide by 0.385 m tall by 0.229 m deep; you'll need to account for that footprint plus bending radius for the flat/screw-type terminals on the main circuit. Mount it where the cooling air moves; at 620 W power loss it dumps heat into the cabinet.
