What this mains choke does in the panel
The Siemens 4EU5021-0AF10-0B is a three-phase mains choke (Netzdrossel) rated for 350 A continuous at 690 V AC, 50 Hz, with 0.35 mH inductance. It sits between the supply and the drive input to smooth line harmonics, limit inrush current, and provide a defined inductive voltage drop of 12.5% at rated current and frequency. The IP00 enclosure means it's an open-frame component intended for inside a cabinet — no washdown rating, no outdoor mounting. Thermal class H insulation (180°C continuous) gives it headroom for high-ambient or overload conditions up to 40°C ambient. Main circuit connections are flat copper busbar terminals, so plan for busbar or cable lug interfaces, not screw-clamp wiring.
That's the figure to match against your drive's input current — not the motor FLA. The 0.35 mH inductance at 12.5% voltage drop is typical for a 3% impedance reactor at this current class; it's sized to limit di/dt and reduce harmonic distortion without dropping excessive voltage under load. The physical footprint is substantial: 0.518 m wide, 0.565 m tall, 0.318 m deep. That's a 19-inch rack width and roughly half a meter of panel height — verify your enclosure backplate has the real estate before committing. The flat connector interface means you're running busbar or compression lugs, not ring terminals on a DIN rail.
Mounting is via the chassis frame — no DIN rail clip, no snap-on. Plan for adequate ventilation around the IP00 core; thermal class H allows 180°C winding temperature, but the surrounding components need clearance. The 0.318 m depth means it won't fit a shallow enclosure — verify door clearance with the gland plate and any front-mounted devices.