The vacuum load switch interrupter is suitable for use in three-phase AC 10KV, 50HZ power systems, or with complete sets of power distribution equipment and ring network switchgear, combined substations, etc. It is widely used in domain network construction and transformation projects, industrial and mining enterprises, high-rise buildings and public facilities, and can be used as ring network power supply or terminal, playing the role of distribution and control of electrical energy. Hongfa vacuum load switch adopts the primary sealing row process, which has the characteristics of high vacuum degree, high voltage resistance, high closing current, long life and low circuit resistance.