The Siemens 4EU3032-0EA28-0EA0 is a 3-phase filter reactor rated at 37.5 kVAR at 400 V, 50 Hz, with a 14% p impedance. It's built to EN 61558-2-20 for choke duty — that standard covers safety and performance of transformers, reactors, and power supply units, so this part is certified for continuous harmonic filtering and line conditioning in industrial power systems. The 14% p impedance means it's a relatively high-impedance reactor, sized to suppress harmonic currents from variable-frequency drives or other non-linear loads on a 400 V, 50 Hz network. The 133 Hz resonant frequency (FRES) tells you where the series resonance sits — well above the 5th harmonic (250 Hz), so it's tuned to avoid amplifying common harmonics in a 6-pulse drive system. IP00 enclosure means it's open-frame — no protection against dust or water ingress. The free conductor ends (TYPE OF TERMINALS:FREE CONDUCTOR ENDS) simplify wiring into a panel but require proper strain relief and termination at the load side.
That's the number to match against your drive's input current and the system's harmonic mitigation requirements. The 14% p impedance is the key selection parameter — it determines the voltage drop and the harmonic attenuation. A 14% reactor is considered a heavy-duty line reactor, typically used on drives with significant 5th and 7th harmonic content or where the utility imposes strict THD limits. The ripple voltage percentages (110 /0 /6 /5) describe the harmonic spectrum the reactor is designed to handle — the 110% figure likely refers to the fundamental voltage, while 6% and 5% are the 5th and 7th harmonic attenuation levels at the rated impedance. The 40 /H thermal class (TA/ISOKL:40 /H) means the reactor is rated for a 40 °C ambient with Class H insulation (180 °C), giving generous thermal headroom for continuous operation in a warm cabinet.