What it is and what it does
The Siemens 4EP3911-0BS00 is a three-phase filter reactor rated at 10 kvar at 400 V, 50 Hz, with 7% detuning. The resonant frequency is 189 Hz, built to EN 61558-2-20.
What the ratings mean for fit
The 10 kvar rating matches a capacitor bank of the same size — this reactor goes in series with the capacitor to form a detuned filter bank. The 7% detuning (p=7) is the standard choice for industrial networks with six-pulse drives; it blocks the 5th harmonic from resonating with the cap bank. The 189 Hz resonant frequency confirms that. IP00 means it's open-frame, intended for inside a clean, dry enclosure — not out on the plant floor where dust and moisture get in.
Termination and integration
Terminals are screw connection — standard for panel wiring. No DIN-rail clip; this is a bolt-down reactor, so plan for chassis mounting inside the enclosure with proper clearance around the magnetic core for cooling.