The Siemens 4EP3804-0ES00 is a 3-phase commutating choke for converter applications, rated at 400V AC and 34A AC with an inductance of 0.82 mH. It's built for line-side or DC-link duty in variable-speed drives and rectifier front-ends, where it limits di/dt and smooths commutation notches. The IP00 enclosure means it's an open-frame component intended for installation inside a cabinet — no washdown rating, so keep it dry and away from conductive dust.
What the ratings mean for fit
The 34A AC rated current and 41.6A DC rated current tell you this choke handles the continuous RMS current of a 34A AC drive input or a 41.6A DC bus. The 3.8% relative inductive voltage drop at rated current, voltage, and frequency means the choke will drop about 15.2V at 400V line — enough to soften current spikes without starving the DC bus of voltage. Thermal class B insulation allows a 130°C hot-spot limit, and the 46.9W coil loss plus 17W iron loss add up to roughly 64W total heat to vent inside the panel at 50°C ambient.
Integration notes
Mounting dimensions: 0.178m wide, 0.153m tall, 0.12m deep. Screw-type terminals accept standard lug or ring-tongue terminations — no spring-cage here. The 50Hz operating frequency is fixed; if your drive runs 60Hz, the choke still works but the voltage drop percentage shifts slightly. Plan for the 64W heat dissipation inside the enclosure — don't bury it next to a heatsink without airflow.