What this choke does in the drive cell
The Siemens 4EU3921-6BA00-0A is a 3-phase commutating choke (line reactor) for converter front-ends, rated 710 A AC continuous (639 A operational) at 500 V, 50 Hz, with a DC rated current of 870 A and a peak current capability of 888 A. The IP00 open-frame construction means it mounts inside a panel or enclosure that provides its own protection — no exposed installation in a washdown or dusty area.
Thermal class H and power loss budget
Thermal class H (180 °C winding hot-spot) per IEC 60085 lets this choke run hot — useful when it shares a cabinet with drives that raise ambient well above 40 °C. Total power loss splits 378 W in the coil and 210 W in the iron core at rated load, so the panel ventilation needs to clear roughly 590 W of heat from this one component. The 40 °C ambient rating is the reference point; above that, derate the continuous current.
Termination and physical fit
Main circuit connection uses flat-type terminals — expect bus-bar or large-lug cabling, not ring-tongue on a terminal block. Dimensions are 0.41 m wide × 0.385 m high × 0.229 m deep, so it needs a clear footprint on the panel floor or a dedicated mounting plate. IP00 means no touch protection; the enclosure must provide the guarding.
The choke is UL/CSA recognized and designed to EN 61558-2-20, covering safety of transformers, reactors, and power supply units. That recognition matters for panel builders who need a UL 508A listed component in the BOM.