Commutating Choke for Converter Duty
The Siemens 4EU3022-5BA00-0AA0 is a 3-phase commutating choke designed for converter applications, rated at 500 V AC with a maximum AC current of 280 A at 50 Hz. It provides an inductance of 0.098 mH and a relative inductive voltage drop of 4% at rated current, voltage, and frequency. The choke is designed to limit di/dt and smooth commutation notches in the DC link of variable-speed drives and rectifier systems. Built to thermal class H per IEC 60085, the choke handles a coil power loss of 220 W and an iron core loss of 110 W at a 40 °C ambient temperature.
The 280 A AC maximum current (Ithmax) at 50 Hz defines the thermal continuous rating — the choke can carry this current indefinitely without exceeding its temperature rise limits. The 252 A AC operational current (ILN) is the rated continuous current under nominal conditions, and the 343.1 A DC rated value reflects the current-carrying capability in DC link applications. The 350 A peak current rating indicates the short-duration surge capacity the choke can withstand without saturating. The 4% relative inductive voltage drop (Uk) at rated current is a key parameter for system designers: it determines the voltage sag across the choke under load and must be accounted for in the DC link voltage budget. The 0.098 mH inductance value is relatively low, typical for commutating chokes that are sized to limit switching transients rather than provide significant energy storage.
The choke measures 0.3 m wide, 0.269 m high, and 0.211 m deep. The main circuit connections use flat-type terminals, which require busbar or flat-cable lugs — not round wire ferrules. At 220 W coil loss plus 110 W iron loss, the total 330 W heat dissipation must be ventilated or cooled within the enclosure. The thermal class H insulation (180 °C hot-spot rating) gives headroom for overloads, but the 40 °C ambient rating is the design point for continuous operation.