The Siemens 4EU4321-0BC00-0A is a three-phase commutating choke designed for converter applications — it sits between the converter and the line or load to limit current rise rates and reduce harmonic distortion. The 0.00002 H inductance and 2 % relative inductive voltage drop are sized for high-current drives where a small inductance is enough to shape commutation notches. Thermal class H insulation (180 °C) means the winding can run hot without accelerated aging — important when the choke is in the same enclosure as the converter.
Sizing and installation constraints
Mounting dimensions are 0.46 m wide by 0.435 m tall by 0.265 m deep; plan for a panel floor area roughly 0.46 × 0.435 m with clearance around the flat-type terminals for busbar or cable lugs. Total power loss is 1010 W (660 W coil + 350 W iron core) — that heat stays inside the cabinet, so the ventilation or air conditioning budget must account for it. The flat connector type on the main current circuit accepts busbar or large cable lugs; no DIN-rail clip here, it bolts directly to the panel floor.