Line reactor for VFD input — what the ratings mean
The Siemens 4EP4000-8US00 is a three-phase mains choke (Netzdrossel f. FU) designed to sit between the supply and a variable-frequency drive. Its job is to smooth current harmonics, limit inrush, and protect the drive's DC bus from line transients. The 112 A maximum current and 100.8 A rated operational current at 500 V AC, 50 Hz tell you this reactor is sized for a drive in the 55–75 kW range depending on load profile — think a 75 kW pump or a 55 kW conveyor with heavy starting duty. The 0.16 mH inductance with a 2% relative voltage drop at rated current is a standard impedance match for most general-purpose VFDs; it keeps the voltage sag low enough that the drive still sees full bus voltage under load. The IP00 rating means this is an open-frame component — no enclosure, no drip shield. It belongs inside a panel, bolted to a mounting plate with adequate clearance for airflow. The 78 W coil loss plus 21.5 W iron loss totals about 100 W of heat to vent; that's not trivial in a sealed cabinet. Plan for forced ventilation or a larger enclosure than the drive alone would need. The Class B insulation (130 °C rise) is the standard thermal class for industrial reactors — it handles the heat without derating up to the 40 °C ambient the rating is based on.
Termination and mounting
Terminals are flat-type connectors — bus-bar style, not ring lugs or spring cages. That means you'll need a flat copper bar or a crimp-on flat terminal to match. The footprint is 0.219 m wide by 0.179 m tall by 0.143 m deep; it's a substantial block, roughly the size of a shoebox on its side. Mounting is via the core's through-holes — no DIN rail clip, so plan for a drilled backplate or a mounting bracket in the panel layout.