What this mains choke does in a drive line
The Siemens 4EU4351-5UB00-0A is a three-phase mains choke (Netzdrossel f. FU) sized for a 1440 A rated current with a 1600 A maximum, designed to sit between the supply and a variable-frequency drive's input rectifier. Its 17 µH inductance and 4 % relative inductive voltage drop smooth line-side harmonics and limit peak currents during commutation events — the kind of duty that keeps upstream breakers from nuisance-tripping on a multi-drive line.
Rated current and thermal margin
The 874 W coil loss plus 370 W iron loss total about 1.24 kW of heat to vent out of the enclosure — that is not a trivial thermal budget; plan forced airflow or derate if the panel ambient climbs above 40 °C.
Voltage and frequency range
Rated for 400 V and 480 V AC supplies at 50 or 60 Hz, so it covers the common industrial voltages across both 50 Hz and 60 Hz regions without re-rating. The 4 % voltage drop at rated current is the standard impedance for a drive input choke — enough to attenuate harmonics without dropping excessive volts across the reactor under load.
Open-frame IP00 — no enclosure, so it mounts inside a cabinet on a dedicated sub-panel or chassis. Dimensions are 0.46 m wide by 0.435 m tall by 0.265 m deep. Main circuit connections are flat-type terminals, which means bus-bar or heavy cable lugs, not spring-cage or screw-clamp. Plan for the physical footprint and the bus-bar routing before the panel layout is locked.