It sits between the AC line and the converter's rectifier to limit current rise, reduce harmonic distortion, and protect the DC bus from line notches. Rated 90 A maximum with a continuous 81 A rating at 50 Hz, it handles the ripple and commutation notches a six-pulse drive throws back at the line. The 0.14 mH inductance provides a relative inductive voltage drop of 0% at rated conditions, meaning it's sized for current-limiting duty rather than significant voltage drop — the choke absorbs the switching edges without stealing voltage headroom from the drive.
Thermal and mounting reality
IP00 open-frame construction means this choke expects a clean, dry enclosure — no washdown, no dust. Panel builders should mount it inside a cabinet with adequate ventilation; total power loss is 87 W (76 W coil + 11 W iron core) at the 40 °C ambient rating, so that heat has to leave the enclosure. Thermal class B per IEC 60085 means the insulation system is rated for 130 °C hot-spot, which gives a comfortable margin above the 40 °C ambient. Dimensions are 0.178 m wide by 0.153 m tall by 0.12 m deep — roughly the footprint of a small contactor but deeper. Main circuit connections are flat-type terminals, which typically accept busbar or ring-tongue lugs; verify lug width against the terminal pad before panel layout.