The vacuum arc extinguishing chamber for load switches adopts ceramic insulation shell and low current cutoff value, long-life WCu contact material, which has the characteristics of small size, long life, high insulation level, and reliable performance. The load switch matched with it has the advantages of simple maintenance, no explosion hazard, no pollution, and low noise, and can be widely used for control and protection of power transmission and distribution systems such as electricity, machinery, metallurgy, chemical industry, mining, etc.