The Siemens 4EP3800-2DS00 is a 3-phase commutating choke designed for converter applications. This choke limits the rate of current rise and smooths commutation notches on the line side of a converter — essential for reducing harmonic distortion and protecting upstream components.
The 36A AC rated current and 40A maximum AC current define the continuous and peak load capability. The DC rated current of 49A and peak current of 50A cover the DC-link side — useful when sizing for a drive with a higher DC bus ripple. The 4% voltage drop is the impedance at rated conditions; a higher drop means more smoothing but also more voltage loss, so match it to the drive's tolerance. Thermal class B means the winding insulation withstands 130°C hot-spot temperature, adequate for most industrial converter cabinets at 40°C ambient.
The choke measures 0.178 m wide, 0.153 m high, and 0.12 m deep. Connections are via screw-type terminals, so no special crimp tooling is needed. The total power loss is 60 W in the coil plus 14.5 W in the iron core — account for that heat in the enclosure's thermal budget.
It is a mature, standard catalog item — not a special or a phase-out line.