The Siemens 4EP3801-0DS00 is a 3-phase commutating choke (line reactor) for converter applications, rated 72A continuous with an 80A maximum current capability. It's built for 400V AC, 50 Hz systems, with an inductance of 0.18 mH and a relative inductive voltage drop of 2% at rated conditions. This choke sits between the converter and the supply line to smooth current ripple, limit di/dt, and reduce harmonic distortion on the mains — a standard fit for variable-frequency drive input or DC-link circuits.
The 72A rated current (80A max) tells you this choke handles the continuous full-load current of a drive in that range — think a 37–45 kW motor at 400V depending on drive efficiency and duty cycle. The 2% voltage drop at rated current is low enough that it won't steal significant voltage from the drive's DC bus under load. Thermal class B insulation (130°C rise) means the choke can run hot in an enclosure without derating, as long as ambient stays at or below 40°C. The 53.4W copper loss plus 17.8W iron loss (71.2W total) is heat that stays in the panel — factor that into your enclosure ventilation if you're stacking multiple chokes.
Mounting and connection realities
IP00 means no enclosure protection — this is an open-frame component for inside a cabinet only. It measures 0.178m wide by 0.153m tall by 0.12m deep, so it'll fit a standard 200mm-deep panel but check your backplate layout before drilling. Main circuit connections are flat-type terminals (not ring or fork lugs), so plan for crimp-on flat connectors or busbar taps. No DIN-rail clip here — this one bolts directly to the panel backplate.