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HXGN15A-12 Box Type Fixed AC Metal-Enclosed Switchgear(hereinafter referred to as "Ring Network Cabinet") is a newly designed switchgear in order to meet the requirements of urban electric network reform and construction. Applicable for AC 50Hz distribution system of 3-10KV, it can be used for breaking of load and short-circuit current as well as closing of short-circuit current. It's widely used as ring network power supply unit and terminal equipment to play a protection role for distribution and control of electric energy and electric appliance for urban electric network construction and reform project, industrial and mining enterprise, tall building and public utility, etc. This ring network cabinet is equipped with vacuum load switch and spring operation mechanism, which is available for either manual or electric operation. Earth switch and disconnecting switch are equipped with manual operation mechanism, and this ring network cabinet owns characters of high complete performance, small volume, no danger of flame and explosion as well as reliable "5-protection" functions. This ring network cabinet complies with relative requirements of GB3906 "3~35KV AC Metal-Enclosed Switchgear" and IEC60420 "AC High-Voltage of Load Switch-Fuse Combined Switch ".