What this filter reactor does
The Siemens 4EP4011-0ES00 is a 3-phase filter reactor rated for 12.5 kVAR at 400 V, 50 Hz, with 7% detuning (P(%):7). That 7% detuning shifts the resonant frequency away from the 5th harmonic — the dominant one from six-pulse drives — so the reactor and capacitor bank don't form a parallel resonance that amplifies harmonics. The 189 Hz resonant frequency (FRES(HZ):189) confirms it's tuned to block the 3.78th harmonic, which is standard for 7% detuned filter circuits in 50 Hz networks. Screw terminals (TYPE OF TERMINALS:SCREW CONNECTION) are straightforward for panel wiring; no special crimp tooling needed.
The 12.5 kVAR rating at 400 V tells you the capacitor bank this reactor is paired with: a 12.5 kVAR capacitor at 400 V. The 7% detuning is the standard choice for mitigating 5th and 7th harmonics from six-pulse drives in industrial networks. If your drives are 12-pulse or active front-end, you might not need this — but for a standard VFD line-up, this is the right reactor. The ripple voltage spec (RIPPLE VOLT. (%):110 /0 /6 /5) describes the voltage drop across the reactor at rated current under different harmonic conditions. The 40 °C ambient rating is standard for panel-mounted gear. EN 61558 is the standard for power transformers, reactors, and similar magnetic components — it covers safety, thermal performance, and short-circuit withstand. That certification means the reactor meets European safety requirements for installation in industrial control panels.