This paper introduces the structure and working principle of VFX high-breaking AC vacuum load switch-fuse combination, expatiates the development content of the product and solves the key technical process. Finally, the new high-breaking high-voltage AC vacuum load switch- Combination of electrical advantages. Vacuum load switch - fuse combination of electrical appliances in China is the most promising a load switch. load switch according to the insulation medium is divided into gas-type load switch, pressure load switch, vacuum load switch and SF6 load switch.
China in the initial stage of development to gas and pressure-type load switch-based, and gas-based load switch due to poor arc suppression capability, is now rarely used. Compressed load break switch by compressed air for arc, breaking with visible arc, the maximum breaking transfer current is small, about 1200A. The SF6 gas in the Kyoto Protocol is included in one of the six restricted greenhouse gases and is a highly potent greenhouse gas. Although SF6 density is greater than air, but with turbulence, it can still move to the upper part of the atmosphere. And once it arrives there, its greenhouse effect will be 24,900 times larger than CO2. The existence of SF6 is estimated to be between 8000 and 10,000 years, the most optimistic estimate is not less than 3200 years. So the vacuum load switch in China is the most promising a kind of load switch.
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