The Siemens 4EU2722-0GB00-0AA0 is a three-phase commutating choke designed for use with line-commutated converters — the kind found in DC drives, battery chargers, and electrolysis supplies. Its job is to limit the rate of rise of fault current and smooth the commutation notches that would otherwise reflect back onto the supply. Rated at 204 A continuous (227 A maximum) on a 50 Hz line, with an inductance of 0.06 mH and a relative inductive voltage drop of 4%, it's sized for a specific converter current and impedance window — not a generic line reactor. Operating voltage listed as 0 V; choke is specified by current and impedance. DC rating 278.1 A. Thermal class H insulation, ambient 40 °C.
IP00 — no enclosure, no drip shield. This choke mounts inside a converter cabinet or a dedicated IP54 panel, not in a wet or dusty environment. The flat-type terminals accept busbar or heavy cable lugs; plan for a bolted connection, not a spring-cage or screw-clamp. Dimensions are 0.27 m wide by 0.248 m tall by 0.187 m deep — roughly the footprint of a small shoe box. Mounting is via the core clamping structure; verify the panel-mounting kit or bracket is available separately.