What it is and what it does
The Siemens 4EU3652-7UA00-1BA0 is a three-phase mains choke (line reactor) designed for the input of a variable-frequency drive (FU). It sits between the supply and the drive to limit harmonic currents, reduce dV/dt stress on the drive's rectifier, and provide some protection against line transients. Rated for 690 V AC at 50/60 Hz, it carries a maximum continuous current of 710 A and a rated current of 639 A — the rated figure is the one to size by for continuous duty; the 710 A maximum covers short-term overloads.
Key ratings and what they mean for fit
Inductance is 0.035 mH (35 µH) per the rated value, with a relative inductive voltage drop of 2 % at rated current. That 2 % drop is typical for a drive-input choke — enough to smooth current without dropping excessive voltage across the reactor under load. The power loss splits into 409 W in the coil and 140 W in the iron core, for a total of 549 W; that heat must be managed in the enclosure, especially given the IP00 open-frame construction (no enclosure, no fan). Thermal class H (180 °C) on the insulation gives headroom for high-ambient installations up to the rated 40 °C ambient. The main-circuit connection uses flat-type terminals — expect busbar or large-lug wiring, not screw-clamp terminals. Physical footprint: 0.35 m wide, 0.321 m tall, 0.237 m deep. That depth is the mounting dimension; allow clearance for the flat terminals and any busbar bends.
Where it is used
This choke is sized for large variable-frequency drives — think 400–500 kW class on a 400 V supply, or higher on 690 V. It goes on the line side of the drive, not the motor side. The IP00 rating means it is intended for installation inside a clean, dry enclosure (typically a motor control center or drive cabinet), not for floor-mounting in a wet or dusty environment. Compliance with EN 61558-2-20 (safety of transformers, reactors, and power supply units) is stated on the nameplate.