The Siemens 4EU2722-0EW00-1BA0 is a three-phase commutating choke (line reactor) designed for converter front ends. It sits between the supply and the converter's rectifier, limiting current rise rates and reducing harmonic distortion on the line side. Rated for 400 V AC at 50/60 Hz, it handles a maximum continuous current of 164 A and a rated current of 147.6 A, with an inductance of 0.18 mH and a relative inductive voltage drop of 4% at rated conditions. The IP00 rating means it's an open-frame component — no enclosure protection against dust or moisture. Thermal class H (180 °C) insulation per IEC 60085 gives it headroom in high-ambient environments up to 40 °C, with power losses split between the coil (159 W) and iron core (104 W). Flat-type terminals for main circuit. Width 0.27 m, height 0.248 m; bolt-down mounting on a plate.
The 164 A maximum current (Ithmax) is the thermal limit for continuous operation at 50 Hz. The 147.6 A rated current (I LN) is the nominal design point where the 4% voltage drop is specified. If your converter's input current exceeds 164 A, this choke will saturate or overheat — step up to the next frame size. The 200.9 A DC rated value suggests this same core can also serve in DC-link applications, but the primary role is AC line commutation. The 0.18 mH inductance and 4% impedance are a matched pair — they define the choke's filtering and current-limiting performance. A lower inductance would pass more harmonics; a higher one would increase voltage drop under load. For replacement, both values must be held to maintain the converter's commutation margin and DC-link ripple.