The Islacontrol Active Tracking Filter Model LPAC-120-1 provides clean AC power by eliminating lower-voltage noise and are ideally installed at specific branch panels or on individual pieces of equipment. Low-voltage noise is caused by everyday events such as turning on appliances or motors, although less dramatic than high-voltage transients, the long-term effect of these frequent disturbances can be just as damaging. Normal Common Mode. 120V, 50/60 Hz, 20.0A.