Passive Harmonic Filters

Designed for three-phase diode and thyristor rectifier

  • Passive Harmonic Filters
    Passive Harmonic Filters

Schaffner offers the new Ecosine evo filters, which combine superior technology to reliably mitigate excessive harmonics with an evolutionary modular product concept. 

Quality standards and performance

The new ecosine filters FN 3440, FN 3450 and FN 3452, designed for three-phase diode and thyristor rectifier, are achieving a THID ≤ 5% even without DC-link choke included in the drive. They guarantee compliance with the toughest requirement of IEEE-519 and other stringent international power quality standards while being the most compact passive harmonic filters available in the market. The filters offer excellent performance at rated power with minimal reactive power, even at partial or no-load conditions. With the installation of the new ecosine filters, the electrical infrastructure is unburdened and its utilization is much more efficient and reliable. Furthermore, the service life cycle of electrical equipment is extended and energy costs are reduced.

Modular concept

Thanks to the modular concept, the filter design also offers great flexibility. It allows to provide the optimal solution by merely “plugging in add-on modules”, according to different installation requirements and motor drive setups. Thus, utilizing the new modular filters allows for the best tailored solutions for applications


Ecosine evo filters are rated for 50 Hz/400 VAC, 50 Hz/500 VAC and 60 Hz/480 VAC grids, respectively, with standard power ratings available from 1.1 to 250 kW. They are available as open frame IP 00 and protection category IP 20. All filters are CE-marked, UL listed and RoHS compliant. The ecosine evo filters are easy to install and maintain and are be fully supported in Schaffner’s simulator SchaffnerPQS3.  

Marta Roberti graduated in Linguistic Sciences at the Catholic University of Milan in February 2016. At the same University, she also obtained a Master in Publishing for Print and Digital Media in November 2016. Since June 2016 she is part of the editorial staff of IEN Europe and IEN Italia in TIMGlobal Media.

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