The potential transformers of the types JDZX10-3/6/12A(B)(REL-12) are single phase, casting resin insulated and full enclosed products. They are used for metering electric energy, voltage control and relay protection in the electric non-useful-ground neutral system up to rated frequency 50 Hz or 60Hz and rated voltage 3kV, 6kV and 12kV. The transformers can be executed according to the standards IEC60044-2 and GB1207-2006.