The Siemens SIDAC 4EU3652-0ED00-4BA0 is a 3-phase AC output reactor (choke) designed for the motor side of a variable-frequency drive. Its job is to limit the rate of voltage rise (dV/dt) and reduce motor-bearing currents caused by reflected wave effects on long cable runs — a common failure mode on VFD-fed motors over 50 m of cable.
Rated 185 A at 1000 Hz fundamental, this reactor handles motor full-load current up to that figure — sized for a 90–110 kW 400 V drive depending on motor efficiency. The 8 kHz switching frequency matches the carrier frequency of most modern IGBT drives; if your drive runs a higher PWM frequency (12–16 kHz), derate the current or step to a reactor rated for that band. Inductance is 0.05 mH (50 µH) per phase. That is a relatively low value — typical for a 3% impedance reactor on a high-current output. It knocks down the dV/dt enough to protect 460 V motor windings on cable runs up to about 100 m. For longer runs or older motor insulation, a higher-inductance reactor (2–5% impedance) would be needed.
Thermal and mounting reality
Total power loss is 502 W — 281 W in the coil and 221 W in the iron core. That heat must be removed from the enclosure. IP00 means no ingress protection: this is an open-frame component intended for a ventilated cabinet or a dedicated electrical room. Class H insulation rated for 180 °C continuous gives thermal headroom, but the ambient limit is 40 °C; above that, derate per IEC 60085 guidelines.
Physical dimensions and connections
Footprint is 0.35 m wide by 0.32 m tall by 0.22 m deep. Main circuit connections are flat-type terminals — expect bus-bar or large-crimp lugs, not screw-clamp blocks. Panel layout needs clearance around the IP00 frame for airflow and service access.