What this mains choke delivers on a drive line
The Siemens 4EU3951-4UA00-0A is a 3-phase mains choke (Netzdrossel f. FU) rated for 900 A continuous with a maximum of 1 000 A, built to sit between the supply and a frequency converter's input. At 690 V AC and 50/60 Hz it's sized for heavy industrial drives, not small VFD cabinets. Rated current is 900 A; maximum is 1 000 A. Coil loss is 380 W, iron-core loss is 190 W at 40 °C ambient.
IP00 means no enclosure — this is a panel-mount component that needs a cabinet for protection. Dimensions are 0.41 m wide, 0.385 m tall, 0.229 m deep — plan the mounting footprint and busbar clearance accordingly. Thermal class H per IEC 60085 means the insulation system withstands 180 °C hot-spot temperature. That's standard for line reactors in high-ambient drive panels, but confirm the enclosure ventilation moves enough air to keep the 570 W heat rise within the panel's rating.
The part carries EN 61558-2-20 as the choke standard. No UL listing is stated in the evidence.