EMI/RFI Power Line Filters Adam Tech EMI/RFI Power Line Filters prevent electromagnetic interference signals from reaching the input power line or the equipment. The filters offer flanged panel or chassis mount options with fused or switch versions. The power line filters are ideal for switching power supplies and medical applications. The Adam Tech EMI/RFI Power Line Filters operate with a 115VAC to 250VAC voltage range and a 1A to 20A current range. Other typical applications for power line filters include industrial, computer, networking, and test and measurement equipment.