The Siemens 4EU4321-0CC10-0A is a 3-phase commutating choke for converter applications, rated for a continuous current of 1800 A with a maximum of 2000 A at 400 V AC, 50 Hz. Per the datasheet, the total power loss splits into 670 W in the coil and 330 W in the iron core, which together define the thermal load the enclosure must vent.
The 1800 A rated value is the continuous thermal current the choke can carry at 40 °C ambient without exceeding thermal class H (180 °C) insulation limits. The 2000 A maximum is the short-time thermal withstand — the current the choke can handle for a defined overload period without damage. For a converter line, the 1800 A figure governs the continuous RMS load; the 2000 A ceiling provides headroom for transient overloads typical during motor acceleration or fault clearing. The DC rated value of 2450.9 A applies when the choke is used in a DC link rather than the AC line side — a useful cross-check if the application is a DC drive retrofit.
Thermal class and enclosure requirements
Rated thermal class H per IEC 60085 means the insulation system is qualified for a continuous hot-spot temperature of 180 °C. The combined 1000 W total loss (670 W coil + 330 W iron core) must be dissipated; at IP00 the choke relies on forced air or cabinet ventilation — it is an open-frame component, not sealed. Mounting within a panel requires clearance for airflow and a thermal calculation to keep the ambient at the terminals below 40 °C. The flat-type main circuit connectors accept busbar or cable lugs; verify the hole pattern matches your existing buswork before committing the BOM line.