The Schneider Electric VW3A46122 is a passive harmonic filter designed to reduce current harmonics from Altivar variable speed drives. It sits between the line supply and the drive input, cleaning up the current waveform so the installation meets IEC 61000-3-4, IEC 61000-3-12, and G5/4 engineering recommendation limits. Rated 14 A input and output at 400 V +/-10%, 50 Hz, it is sized for drives up to 7.5 kW / 10 hp across the ATV61, ATV71, ATV630, ATV650, ATV930, and ATV950 families.
Harmonic performance and what the THDI numbers mean
THDI (total harmonic distortion of current) varies by drive model: 10 % for ATV61H, ATV71H, ATV71P, and ATV71W; 5 % for ATV61W, ATV630, ATV650, ATV930, and ATV950. That 5 % figure on the newer platform drives means the filter nearly eliminates the 5th and 7th harmonics that typically cause transformer overheating and nuisance breaker trips. The filter also delivers power factor correction — cos φ of 0.99 at full load, 0.85 at 75 % load, and unity at 150 % line current — so you are not paying a VAR penalty on the utility bill.
Efficiency, thermal load, and derating
At 98 % efficiency, the filter dissipates 184 W as heat. That is the number to use for enclosure ventilation sizing. Operating ambient is 5 to 45 °C without derating; above 45 °C up to 60 °C, derate current 3 % per °C. Above 1000 m altitude, derate 5 % per additional 1000 m. The filter is Class F insulated and rated IP20 (IP55 when enclosure-mounted), so it is intended for a clean, dry electrical room or a sealed cabinet.