What this choke is and where it fits
The Siemens 4EP4002-3DS00 is a 3-phase commutating choke (line reactor) for converter applications, rated 400V AC at 50Hz. It handles a maximum continuous current of 91A and a rated current of 81.9A, with a DC-rated value of 111.5A. The inductance is 0.31mH, and the relative inductive voltage drop is 4% at rated current, frequency, and voltage — a standard value for limiting current rise and harmonics on the line side of a drive.
Key ratings and what they mean for your drive line
The 91A maximum current (81.9A rated) and 111.5A DC rating tell you this choke is sized for a drive drawing around 75–90A continuous on the line side. The 4% inductive voltage drop is typical for a commutating choke — it provides enough impedance to smooth commutation notches and limit di/dt without dropping excessive voltage under load. The 72.6W coil loss plus 35.8W iron-core loss (108.4W total at rated conditions) is heat that must be dissipated; with IP00, the choke is open-frame and relies on cabinet airflow — no enclosure to trap heat, but also no protection from dust or accidental contact.
Physical fit and panel integration
Dimensions: 0.219m wide, 0.179m high, 0.143m deep. This is a panel-mount component, not a DIN-rail snap-on — it bolts into the cabinet. The 0.143m (143mm) depth is the front-to-back dimension; allow clearance for the flat-type terminal connections and bending radius of the incoming cables. IP00 means no finger-safe enclosure, so it belongs behind a locked panel door or inside a dedicated drive cubicle.