The Siemens 4EU4521-0CC10-0B is a three-phase commutating choke for converter applications, rated 1059 A at 1060 V AC, 50 Hz. Its 45 µH inductance limits di/dt and reduces commutation notches on the line side of a thyristor or IGBT converter bridge. This is a high-current, open-frame (IP00) component sized for large drives or power converters. The 1059 A continuous rating and 1060 V insulation class put it in the heavy-industrial band — think mill drives, marine propulsion converters, or large pump/compressor VFD line-ups. Total power loss at rated load sums to 1010 W (660 W coil + 350 W iron core), which means forced-air cooling or a dedicated ventilation slot in the enclosure is mandatory. The thermal class H winding (IEC 60085) allows a 180 °C hot-spot limit, but the 40 °C ambient rating is the design point — derate above that.
Sizing and integration notes
Physical envelope: 0.46 m wide × 0.435 m high × 0.293 m deep. Plan for floor-mount or heavy steel sub-panel. Termination is via flat-type connectors, so the mating busbars or cable lugs need to match a flat interface. No screw-clamp or spring-cage option — budget for custom busbar fabrication if your panel is built around ring terminals. The relative inductive voltage drop is 2.96 % at rated current, frequency, and voltage. That figure tells you the choke's impedance at line frequency — useful for calculating the actual voltage available at the converter input under load.