The Siemens 4EP3201-0US00 is a three-phase mains choke (line reactor) designed for the input side of variable frequency drives. It sits between the supply and the drive, smoothing current draw and limiting harmonic distortion. Rated for 400/480V AC at 50/60Hz, it carries a continuous rated current of 2.7A with a 3A maximum, and provides 0.0097H (9.7mH) of inductance with a 4% relative inductive voltage drop at rated conditions.
What the ratings mean in practice
The 2.7A rated current (3A max) tells you this choke is sized for a drive drawing roughly that continuous input current — think a small pump or fan motor on a 400V line. The 4% voltage drop at rated current is the trade-off: you get meaningful harmonic attenuation and dV/dt protection, but the drive sees a slightly lower bus voltage under load. That 4% figure is measured at the rated current, voltage, and frequency — it's the design point, not a worst-case ceiling. The 0.0097H inductance is fixed; this isn't a tunable reactor. It's wound for thermal class B (130°C rise per IEC 60085), with a 14W copper loss and 6W iron loss at rated load. That's 20W total heat you need to vent — IP00 means no enclosure, so it's open-frame and intended for a cabinet with forced air or natural convection. Mount it with clearance around the core.
This choke is panel-mount, not DIN rail. The 0.108m height and 0.088m width footprint fits a standard subpanel, and the 0.057m depth means it won't crowd the gland plate in a 200mm-deep enclosure. Connections are screw-type or tab terminals on the main circuit — solid for a permanent install, but not quick-disconnect. You'll land line-side lugs on one end and drive-side on the other.