Output reactor for VFD motor protection
The Siemens SIDAC 4EU3052-0EC00-0A is a 3-phase output reactor rated for 166 A maximum continuous current and an 8 kHz switching frequency, with 0.05 mH inductance per phase. It sits between the variable-frequency drive and the motor to limit dv/dt and reduce bearing currents on long cable runs.
The 166 A maximum governs the drive size it pairs with — match it to a drive whose rated output current does not exceed this figure. The 8 kHz switching frequency matches modern IGBT drives; lower-switching drives still work, but the reactor's core is optimized for that band. The 0.05 mH inductance is a moderate value — it smooths edges without dropping excessive voltage under load. The IP00 enclosure means it is not sealed; mount it inside a clean, dry cabinet away from washdown or dust.
Dimensions are 0.3 m wide by 0.26 m tall by 0.21 m deep — a compact footprint for a 166 A reactor. Connection is via flat-type terminals, so plan for lug or bus-bar terminations, not spring-cage. The thermal class H winding handles 180 °C hot-spot; combined copper and iron losses total 396 W at rated load, which must be ventilated out of the enclosure.