What this reactor does on the line
The SIDAC 4EP3900-5MS00 is a 3-phase filter reactor rated for 400 V AC at 50 Hz, carrying a continuous rated current of 15.8 A with a maximum of 17.5 A. Its 5.67% relative throttling factor and 0.0031 H inductance are sized to attenuate harmonic currents from VFDs or UPS systems, protecting upstream transformers and switchgear from excessive THD. The 10 kvar reactive power rating gives the panel designer a hard number for capacitor bank coordination. Thermal class B (130 °C rise) per IEC 60085 means it handles the 64 W power loss without forced cooling in a standard IP00 enclosure — mount it in a ventilated cabinet section, not sealed.
Fit and mounting — what the IP00 and terminals tell you
IP00 means no built-in enclosure protection — this reactor is a chassis-mount component for a panel interior, not a standalone box. Dimensions are 0.219 m wide by 0.179 m tall by 0.123 m deep, so it occupies roughly a 220 mm × 180 mm footprint on the backplate.
What the resonant frequency means for your drive system
The filter's resonant frequency is 210 Hz, which is above the 5th harmonic (250 Hz on a 50 Hz fundamental) and below the 7th. This placement means the reactor presents high impedance to dominant harmonics from a 6-pulse rectifier while avoiding series resonance with typical line-side capacitors. If your drive manufacturer specifies a 3% or 5% impedance reactor, the 5.67% figure here is a slightly higher impedance — verify drive compatibility, especially for DC bus voltage drop under load.