DR High-Performance Filters Delta Electronics / Power DR High-Performance Filters are two-stage filters with a 2A to 20A current rating that suppress both line-to-line and line-to-ground noise. The DR series offers a variety of termination options, 50Hz/60Hz operating frequency, and 115VAC/250VAC rated voltage. The filters have hipot ratings (1 minute) of 2250VDC for line-to-ground voltage and 1450VDC for line-to-line voltage. Delta DR High-Performance Filters are UL recognized, CSA certified, and VDE approved.