The 4EM50054CB: The Siemens 4EM5005-4CB is a commutating choke — a line reactor sized for 36 A continuous at 50 Hz, used to limit current rise and reduce harmonic distortion on the input of variable-frequency drives or other power-conversion equipment.
Rated 36 A at 50 Hz: this is the continuous current the choke is designed to carry without saturating or overheating. On a 400 V three-phase drive input, 36 A typically corresponds to a motor load around 18–22 kW, depending on the drive topology and duty cycle. The 50 Hz rating means it is tuned for line-frequency operation — fine for standard 50 Hz mains, but if your site runs 60 Hz, the impedance and saturation behaviour shift; verify with the drive manufacturer before committing the BOM line.