The Siemens 4EM5200-0AK00 is a 1-phase commutating choke designed for converter applications. It carries a maximum current of 90 A and a rated current of 81 A at 230 V AC, 50 Hz — the 81 A figure is the continuous thermal rating under the specified ambient of 40 °C and thermal class B insulation per IEC 60085, so that is the number to use for sustained line-side filtering duty. The 90 A maximum is the short-term overload ceiling, not a steady-state limit. Inductance is 0.0002 H (0.2 mH), with a relative inductive voltage drop of 1.91% at the rated current, voltage, and frequency. That drop figure tells you the choke's impedance at 50 Hz — useful for predicting voltage sag across the component in the converter's DC link or AC input stage.
This is an open-frame (IP00) component — no enclosure, so it must be installed inside a panel or cabinet that provides the environmental protection. Dimensions are 0.149 m depth, 0.121 m width, 0.109 m height. The screw-type terminals accept the main circuit wiring; plan for panel space that accommodates the choke body and clearance for air circulation around the thermal class B winding.