HPS Synergy® energy efficient K-factor distribution transformers are rated for 600 volts and below. K-factor transformers are most frequently used for applications such as commercial or institutional buildings. Energy efficient K-factor transformers are energy efficient general purpose transformers, but are designed to tolerate the harmonics distortion associated with non-linear loads. HPS Synergy® transformers are designed to tolerate heating due to harmonics associated with non-linear loads. Harmonics can indicate their presence in a number of ways: overheating, device malfunctions, telephone interference, equipment vibration and breakers tripping.