What this reactor does on a 3-phase line
The SIDAC 4EP4000-1KP00 is a 3-phase filter reactor rated for 400 V AC at 50 Hz, with a rated current of 15.8 A and a maximum of 17.6 A. Its 7% relative throttling factor means it introduces a 7% voltage drop at rated current — typical for harmonic mitigation and inrush limiting on drives and power converters. The 0.0039 H inductance and 189 Hz resonant frequency place it in the standard line-reactor class for 6-pulse rectifier front ends. IP00 means it's an open-frame component — no enclosure protection.
Sizing and thermal considerations
Rated for a 40 °C ambient with thermal class B insulation per IEC 60085, meaning a 130 °C continuous temperature limit on the winding. The reactive power rating of 10 kvar gives a quick sanity check: at 400 V and 15.8 A, the apparent power per phase is about 6.3 kVA, so the 10 kvar total across three phases is consistent with a reactor that's mostly reactive at line frequency.