The Siemens 4EU3951-7UA00-0A is a three-phase mains choke rated for 500 V AC at 50 Hz, with a maximum continuous current of 710 A and a rated operational current of 639 A.
The 710 A maximum current is the thermal limit at 40 °C ambient — derate above that. The 639 A operational current is the continuous rating under the 50 Hz fundamental. The 0.051 mH inductance is low enough for high-current drives; a higher-inductance choke would drop more voltage and may not be needed if the line impedance is already decent. The 540 W coil loss plus 192 W iron loss means the choke dissipates about 732 W total at rated load — that's heat that stays in the enclosure, so factor it into your panel cooling. Thermal class H means the winding insulation can survive 180 °C hot-spot, which is generous for a choke that normally runs cooler; it gives headroom for overloads.
IP00 means no enclosure — this is an open-frame choke meant for a cabinet, not a standalone box. The flat-type terminals are heavy-duty bus-bar lugs, not screw clamps; you'll need to bolt on ring-tongue lugs or bus bars sized for 710 A. Dimensions are 0.41 m wide by 0.385 m tall by 0.229 m deep — it's a substantial block, roughly 16 by 15 by 9 inches. Plan for adequate clearance around it for airflow; the 732 W dissipation won't vent well if it's jammed against other gear.