XGN17-12(ZF.R) AC high-voltage vacuum ring switchgear, within which equipped with FZN-12QD type or LK-VLBS1 type indoor high-voltage vacuum load switch, FZRN-12QD type or LK-VLBS2 type indoor high-voltage vacuum load switch fuse combinations and CT12 spring operating mechanism, it is suitable for three-phase AC power distribution system of 12kV, 50Hz. For breaking or closing load current, breaking short circuit current, closing short-circuit current, breaking transformer no-load current, charging current from the overhead line or cable line in certain distance, it can control and protect power equipment. This product is the important switchgear of ring network power supply and terminal power supply, can be widely used in electric department and both high-voltage and low-voltage prefabricated substation, such as substations, industrial and mining enterprises, high rise buildings, residence community. The technical specification is totally reached the requirements of IEC298, IEC420, GB3906, GB3804, DL404.