The passive VLT® Advanced Harmonic Filter is specifically designed to match the Danfoss frequency converters with a facility to switch in /out the capacitance during stop periods. Optimised harmonic performance for VLT® frequency converters. Compared to traditional harmonic trap filters, the VLT® Advanced Harmonic Filter offers a smaller foot print and higher harmonic reduction.

The filter is available in two variants, AHF 005 and AHF 010. When connected at the input to a Danfoss VLT® frequency converter, the harmonic current distortion generated back to the mains is reduced to 5% or 10% Total Harmonic Current Distortion (THiD) at full load. With efficiency exceeding 98 % the passive filters AHF 005 and AHF 010 off er cost-effective and very robust harmonic solutions specifically for power ranges up to 250 kW. 

As stand-alone options the advanced harmonic filters feature a compact housing that is easily integrated into existing panel space. This makes them well-suited for retrofit applications with limited adjustments of the frequency converter.