ABB's K-Factor transformers are designed to withstand the additional heating that accompanies the presence of harmonics in electrical systems. K-Factor transformers are designed not to eliminate harmonics, but to withstand their negative effects. They are available with aluminum or copper windings and in all three temperature rise ratings. K-Factor transformers meet DOE 2016 efficiency standards and are UL Listed and Energy Verified. Qualified to the seismic requirements of IEEE-693-2005 and the IBC-2021 and CBC 2022.