The Siemens 4EU4321-0CE10-0B is a commutating choke (line reactor) for converter drives — three-phase AC, rated 1000 A continuous at 400 V, 60 Hz. That 1000 A figure is the thermal maximum (Ith) at 40 °C ambient, so it carries the full converter current without saturating. The 0.036 mH inductance and 6 % relative inductive voltage drop are sized for typical 6-pulse rectifier front ends, limiting di/dt and reducing harmonic stress on the DC link capacitors. At DC the same choke is rated 1225.4 A — that's the current it can handle if the converter output is feeding a DC bus or a regenerative load. The IP00 open-frame construction means it's intended for enclosure mounting, not standalone floor placement; plan for a cabinet with proper ventilation and clearance around the 0.435 m height × 0.46 m width × 0.265 m depth footprint.
Thermal class and connection
Thermal class H per IEC 60085 means the insulation system withstands 180 °C hot-spot temperature — that's the margin for overload cycles and high ambient inside a drive cabinet. The main circuit terminates on flat-type connectors (bus-bar style), not ring lugs or spring cages; plan for bolted connections sized to 1000 A continuous.