Commutating Choke for Converter Duty — 800 A, 33 µH
The Siemens 4EU3622-4AA00-1BA0 is a three-phase commutating choke (line reactor) designed for converter input circuits, rated at 720 A continuous with an 800 A maximum thermal current at 400 V AC, 50 Hz. The 33 µH inductance limits the rate of current rise (di/dt) during converter commutation, reducing harmonic distortion and protecting the converter's input diodes and thyristors from excessive switching stress.
The 800 A maximum thermal current (Ith) governs the conductor and terminal sizing — the flat-type connectors are designed for bolted bus-bar or large cable lugs, not DIN-rail terminal blocks. Total power loss is 467 W (280 W coil + 187 W iron core), which must be ventilated — IP00 means no enclosure, so it is intended for cabinet mounting with forced or natural convection clearance around the core.