Small-sized vacuum ring main unit

The utility model relates to a small-sized vacuum ring main unit, which comprises a body, A-phase, B-phase and C-phase buses, A-phase, B-phase and C-phase bus insulators, A-phase, B-phase and C-phase disconnecting switches, A-phase, B-phase and C-phase disconnecting switch driving mechanisms, A-phase, B-phase and C-phase embedded poles, A-phase, B-phase and C-phase vacuum interrupter operating mechanisms and A-phase, B-phase and C-phase current transformer. The small-sized vacuum ring main unit is characterized in that an insulating cover is arranged among the A-phase, B-phase and C-phase disconnecting switches so as to guarantee electrical safety, simplify a transmission device and realize simple and reliable five-protection interlock, one of the main buses is arranged transversely while the other two main buses are arranged vertically so as to guarantee electrical safe distance and simultaneously reduce space of a main bus chamber, vacuum interrupters, vacuum interrupter operating mechanisms and lower wire