What it is and where it fits
The Siemens 4EU2732-5MA08-0AA0 is a SIDAC-branded 3-phase filter reactor rated for 400V AC at 50Hz. It carries a maximum AC current of 80.3A and an operating current of 72.3A, with a 7% relative throttling factor and a resonant frequency of 189Hz. The 223W power loss at rated load means it needs ventilation clearance in the panel — IP00 rating confirms it is an open-frame component for cabinet mounting only, not for washdown or outdoor exposure. Thermal class H (180°C) insulation gives headroom for elevated ambient temperatures up to 40°C.
What the ratings mean for your panel
The 7% throttling factor means this reactor limits harmonic currents and reduces voltage notching on the line side of a variable-frequency drive or soft starter — a common choice for 6-pulse rectifier front ends. The 189Hz resonant frequency is well above the 50Hz fundamental, so it does not create a low-impedance trap at line frequency. At 72.3A operating current and 50 kvar reactive power, it is sized for drives in the 37–45 kW range on a 400V supply. The flat connector / screw-type terminals accept busbar or cable lugs; plan for the 0.187m depth and 0.27m width when laying out the sub-panel. IP00 means the reactor must be inside a grounded enclosure — no exposed live parts in the cabinet.