The Siemens 4EP3600-3US00 is a three-phase mains choke (line reactor) designed for use with frequency converters — the German product designation "Netzdrossel f. FU" tells you exactly that. It's rated for 22.4 A maximum continuous current at 500 V AC, 50 Hz, with an inductance of 0.82 mH and a relative inductive voltage drop of 2% at rated conditions. That 2% drop is typical for a line reactor sized to smooth incoming power and limit harmonic distortion and peak currents on the drive's input side. The 22.4 A rating is the thermal maximum (Ithmax) — the continuous current it can carry at 40 °C ambient without exceeding the Class B temperature rise limit per IEC 60085. The slightly lower 20.16 A operational current (I LN) reflects the nominal load point under rated voltage and frequency. Total power loss splits between 49.6 W in the coil and 3.8 W in the iron core, which matters for enclosure heat buildup.
Dimensions are 0.148 m wide by 0.139 m tall by 0.078 m deep, with screw-type terminals for the main circuit connections. Plan for adequate clearance around the choke for airflow; the 49.6 W coil loss needs ventilation to stay within the 40 °C ambient rating.