What this line reactor does in the panel
The SIDAC 4EP4011-0CP00 is a 3-phase filter reactor rated for 400 V AC at 50 Hz, carrying a continuous 18.1 A (20.1 A maximum). It delivers 12.5 kvar of reactive power with a 7% relative throttling factor, meaning it detunes the filter bank away from the 5th harmonic — the standard tuning for preventing resonance with the 250 Hz harmonic common on 50 Hz industrial networks. The resonant frequency lands at 189 Hz, which is the textbook target for a 7% reactor on a 50 Hz supply. The 0.0031 H inductance and thermal class B insulation (130 °C continuous) suit it for power-factor correction banks or harmonic filter cabinets where the reactor sits in series with the capacitor. IP00 means it is an open-frame component — it needs enclosure in a panel or cabinet; there is no finger-safe housing. Connections are free cable endings, so expect to terminate with ring lugs or ferrules inside the cabinet. Rated for a 40 °C ambient, this reactor can be installed in a ventilated low-voltage switchboard alongside other heat-generating components, provided the enclosure is sized for the thermal load. The depth of 0.143 m, width of 0.219 m, and height of 0.179 m define the mounting footprint — verify clearances for the free cable ends and air circulation around the core.
What the 7% detuning means for coordination
A 7% detuning factor is the most common choice for power-factor correction in industrial plants with 6-pulse drives and other non-linear loads. It shifts the filter's resonant frequency below the 5th harmonic (250 Hz on 50 Hz systems), so the capacitor bank does not amplify harmonic currents. The 189 Hz resonant frequency of this reactor confirms that tuning. If the plant has significant 3rd harmonic content from single-phase loads, a 14% reactor (resonant at 134 Hz) would be the alternative — but 7% covers the majority of motor-drive environments. The rated reactive power of 12.5 kvar means this reactor is sized for a capacitor bank of that output. Pair it with a capacitor of the same kvar rating at 400 V. The 18.1 A rated current (20.1 A max) sets the upstream protection: a circuit breaker or fuse should be coordinated to the reactor's thermal class B limit and the capacitor's inrush.