Harmonic Circuit Filter Reactors are designed for dampening the effects of harmonic currents on PFC capacitors and are used to prevent harmonic resonance from occuring. Chosing correct harmonic circuit reactor for correct PFC application is requires a carfeul examination of system. Type: Open type Protection index: IPOO Safety class: Class 1 Ambient temperature: ta40°C/B According to: EN61558 2-20