What this choke does in the circuit
The Siemens 4EU3022-0EJ00-1BA0 is a three-phase commutating choke (line reactor) designed for the converter side of a drive system. It limits the rate of rise of current during commutation, reducing harmonic distortion and protecting the converter diodes from di/dt stress. Rated for 400 V AC at 50/60 Hz, it carries a maximum current of 410 A and a continuous rated current of 369 A.
The 0.074 mH inductance is the core parameter that defines the choke's impedance at line frequency. At 50 Hz the inductive reactance is about 23 mΩ, producing a relative voltage drop of 4% at rated current. That 4% drop is typical for a commutating choke — enough to limit fault current rise but low enough to keep most of the line voltage across the load. The 369 A continuous rating is the thermal limit at 50 °C ambient; the 410 A maximum is the short-time overload ceiling, not a steady-state figure. If your drive's continuous input current exceeds 369 A, this choke will overheat.
Thermal and mounting constraints
Total power loss is 365 W — 205 W in the coil and 160 W in the iron core. That heat must be dissipated into the enclosure air; the IP00 rating means no enclosure of its own, so it relies on the panel's ventilation. Thermal class H per IEC 60085 means the insulation system is rated for 180 °C hot-spot, which gives margin in a 50 °C ambient but still requires airflow. The flat-type terminals accept busbar or large cable lugs — no screw-clamp terminals for fine-stranded wire. Dimensions are 0.3 m wide, 0.269 m tall, and 0.221 m deep; plan panel space accordingly.