DP Switching Transient Filters Delta Electronics / Power DP Switching Transient Filters have a 3A to 30A current rating and provide EMI suppression for line-to-line and line-to-ground noise. These two-stage, high-performance filters are available in terminal, wire, or screw termination options. Other features include 50Hz/60Hz operating frequency, 115VAC/250VAC rated voltage, and hipot ratings (1 minute) of 2250VDC for line-to-ground voltage and 1450VDC for line-to-line voltage. Delta DP Switching Transient Filters are offered in a standard version for general purpose applications as well as a medical version.