The JLSZW-6/12 are fitted with voltage and current instrument transformers. The product is used in three-phase systems of rated frequency of 50/60Hz and rated voltage of 12kV. The product is alternative to JLSJW-12 oil-immersed combination transformer. The products are used in metering electric energy, voltage controlling and relay protection applications. The products are suitable for outdoor transformer substations in rural areas, as well as for industrial services. It is alternative to JLS-12 oil immersed combination transformer.