The Siemens 4EU4321-3BA00-0A is a three-phase commutating choke for converter applications — a line reactor that sits between the converter and the AC supply to limit current rise rates, reduce harmonics, and protect the DC link from line-side transients. Its 567 A rated current (630 A maximum) at 750 V AC, 50 Hz makes it suitable for medium-to-large drive and converter systems.
Maximum is 630 A for short-time overload. That 4 % impedance is typical for line reactors sized to limit fault current and smooth commutation notches without dropping excessive voltage across the choke under load. Power loss is 460 W in the coil and 315 W in the iron core. At IP00 the choke is open-frame and requires cabinet mounting.
This is a panel-mount component — 0.435 m high, 0.46 m wide, 0.265 m deep — that connects via flat-type terminals on the main circuit. It is designed for three-phase AC lines at 50 Hz. The open-frame IP00 construction means it belongs in a ventilated electrical cabinet, not a standalone enclosure.