Is a new type of GIS product researched and developed based on such advantages of type ZF7A as superior breaking performance and reliable operation etc., so to meet the requirement of smaller land area, higher integration of components, maintenance-free and un-manned duty from the clients etc. The product is of three-phase enclosed and such key technology as complete aluminum alloy enclosure and three-position disconnector is adopted. The product possesses the bay width of 1 meter or less, compact structure, small land area, small space, bay shipment, convenience in installation, commissioning, and shorter installation period at site. The product has the dielectric level and breaking capability at 145kV and has passed the whole type test at China National High Voltage Apparatus Quality Supervision and Testing Center in Xi’an.