SM66 unit type SF6 ring net cabinet with SF6 load switch as main switch, for whole cabinet is suitable for electric distribution automation and compact also expandable metal close switchgear. It characters in its simple structure, flexible operation, reliable interlocking and convenient installation etc. With the adoption of sensor technology and the protection relay up to date, plus the advanced technology and flexible assembly project, SM66 unit type SF6 ring net cabinet can meet the requirement of continuously variable market. It can take self-produced RLS-40.5 load switch or SFG type SF6 load switch by ABB; also per user's demand can be assembled with the internationally top-ranking RCB series vacuum CB with AREVA permanent magnetic mechanism or AREVA/ABB HD4 type SF6 circuit breaker or with our VS1-12 type vacuum CB with permanent magnetic mechanism.