What this mains choke does for a VFD line
The Siemens 4EU3652-6UB00-0AA0 is a three-phase mains choke — a line reactor — sized for the input of a variable-frequency drive (Netzdrossel f. FU). Its job is to limit harmonic distortion, smooth line-side current spikes, and protect the drive's rectifier from grid-borne transients. Rated for 360 A continuous with a 400 A maximum, it sits upstream of the VFD in a 500 V AC, 50 Hz system. The 0.091 mH inductance and 4 % relative inductive voltage drop are the key numbers for sizing: that drop tells you how much voltage the choke consumes at rated current, which you need to budget in the drive's input voltage margin.
The 360 A rated current (I LN) and 400 A maximum (Ithmax) define the thermal envelope: the choke can carry 360 A continuously in a 40 °C ambient without exceeding Class H (180 °C) insulation temperature rise. Total copper loss is 300 W, iron-core loss 135 W — that heat must be shed. IP00 means no enclosure; the choke is an open-frame component intended for mounting inside a ventilated panel or drive cabinet. UL and CSA recognition per EN 61558-2-20 is noted in the description — a signal for North American panel shops that the component meets transformer / reactor safety standards.
The choke measures 0.35 m wide by 0.321 m tall by 0.237 m deep — roughly 14 × 12.6 × 9.3 inches. That is a substantial block; verify panel door clearance and mounting plate space before committing. The flat-type terminals call for bus-bar or compression-lug connections, not ring-tongue terminals on small-gauge wire. IP00 means no drip shield — keep it above any potential condensation path or dripping cable glands in the enclosure.