The Siemens 4EM5200-1CB00 is a 1-phase commutating choke (also called a line reactor or commutation reactor) designed for converter applications. The inductance is 0.0012 H (1.2 mH), and the relative inductive voltage drop at rated conditions is 4%.
The 36 A rated current (40 A maximum) sets the continuous load capacity for motor-drive or converter line-side filtering. The 4% impedance is typical for a line reactor that limits harmonic distortion and reduces peak currents on the converter input — a standard value for most variable-frequency drives in industrial panels. The 0.0012 H inductance, combined with the 400 V / 50 Hz rating, means this choke is sized for a single-phase converter branch drawing up to 36 A.
This choke mounts in a converter or drive panel, typically on the input side of a variable-frequency drive or DC drive to smooth current ripple and limit inrush. The screw-type terminals (main circuit connection) accept standard power wiring. Dimensions: 0.128 m deep, 0.121 m wide, 0.131 m high — fits a standard cabinet footprint. The thermal class B (IEC 60085) insulation system allows a 40 °C ambient with a 19.8 W coil loss and 33.7 W iron-core loss; derate if ambient exceeds 40 °C.