LFZZJ-10 current transformer, epoxy resin casting insulation and fully enclosed support construction, encloses primary & secondary windings and annular core in the epoxy resin casting body. The product has large external insulation creepage distance, withstands nastiness and dampness. It is widely used for measuring current, electric energy and relay protection in the electrical system with the rated frequency 50Hz or 60Hz and highest voltage for equipment 12kV.