The Siemens 4EU4521-0BN10 is a commutating choke (line reactor) designed for converter applications. It is a 3-phase AC choke rated for 380 V operating voltage and 532 A continuous current, with an inductance of 0.00018 H (0.18 mH). This choke limits current rise and harmonics on the line side of a converter, protecting both the converter and upstream equipment. The 532 A rating means it can handle the full-load current of a large drive or rectifier without saturating.
The 532 A rated current is the maximum continuous current the choke can carry at the rated 380 V AC and 50 Hz without exceeding its thermal limits. For DC applications, the choke is rated at 651.9 A DC — a higher figure because DC current has no skin effect and lower core losses. This makes the 4EU4521-0BN10 suitable for both AC and DC converter circuits within those limits. Total power loss is 1027 W (737 W in the coil plus 290 W in the iron core) at the rated operating point. That loss becomes heat inside the panel — plan for forced ventilation or derating if ambient exceeds 40 °C. The Class H insulation rated to 180 °C hot-spot gives thermal headroom for short overloads. IP00 protection means the choke has no enclosure — it is an open-frame component intended for mounting inside a switchgear cabinet or converter cubicle. The flat-type main circuit terminals accept busbar or large cable lugs, typical for high-current power connections.
This choke is deployed on the AC line side of variable-frequency drives, DC drives, rectifiers, and other power converters to smooth current, reduce harmonic distortion, and limit inrush. It is a standard component in industrial motor control centers and large drive systems where a 3-phase, 380 V, 532 A line reactor is called for.