This type of high-voltage vacuum load switch and combined electrical appliance is suitable for three-phase AC 40.5kV, 50HZ power system, or with the power distribution equipment and ring network switchgear, combined power station, etc., widely used in wind power generation. Cheng network construction and transformation projects, industrial and mining enterprises, high-rise buildings and public facilities, etc., can be used as a ring network power supply unit or terminal equipment, which plays a role in the distribution, control and protection of electric energy. The technical performance of the product meets the requirements of GB16926-1997 "AC high voltage load switch-fuse combination electrical appliance" and IEC420 "AC High voltage load switch-fuse combination electrical appliance". This product has the advantages of large breaking capacity, safety and reliability, long electrical life, frequent operation, compact structure, small size, light weight, and basically no maintenance. It has the ability to break the rated current, overload current, short circuit current and prevent the equipment from running without phase, the switch has an obvious isolation fracture, and is equipped with a ground switch and an electric spring mechanism related to the closing capacity, and has the remote control ability.