i'v rresearched on it. Not completely sure if wt i have is correct. Though its not complete. : for current transformer; Variables for Consideration Current Range Overload current rating Primary conductor opening Sensitivity - volts per amp Burden VA and resistance Internal / external termination Frequency response Accuracy and linearity Ambient temperature / allowable temperature rise Dielectric / insulation resistance Cost....... I'v still not gotten for voltage transformers. Hoping y'all will help mi out with ideas and reference