What this mains choke does on the line
The Siemens 4EU3951-0BA10-0A is a three-phase mains choke (Netzdrossel) rated for 360 A AC at 690 V, 50/60 Hz, with 0.27 mH inductance. It sits between the supply and a variable-frequency drive or converter, smoothing line-side harmonics and limiting inrush current. The 9.2 % relative inductive drop at rated current tells you the voltage it eats at full load — factor that into your drive bus design.
Thermal and enclosure reality
IP00 means no enclosure — this choke is a bare core-and-coil assembly for cabinet mounting, not a standalone box. Thermal class H (180 °C winding hot-spot) and a 45 °C ambient rating give headroom in a warm panel, but the combined copper and iron losses run about 1554 W (975 W coil + 579 W iron core). That heat has to leave the cabinet; plan forced ventilation or a properly sized enclosure.
Physical fit and connections
Dimensions: 0.385 m high, 0.41 m wide, 0.229 m deep. The main circuit terminates on flat connectors — no ring lugs or bus-bar studs. Verify your panel's mounting plate and bus-bar layout against those dimensions before committing the cutout.
Designed to EN 61558-2-20, the standard for separating transformers and chokes. The 690 V rated voltage covers 400 V and 480 V systems with margin; the 50/60 Hz rating means it works on either line frequency without derating.