The vacuum arc extinguishing chamber for contactors adopts ceramic insulation shell and low current cutoff value Cu (W+WC) contact material. The product has the characteristics of small volume, long service life, and reliable performance. The contactor matched with it has the advantages of simple maintenance, no explosion hazard, no pollution, and low noise. It can be widely used for control and protection of power transmission and distribution systems such as electricity, machinery, metallurgy, chemical industry, mining, etc., especially suitable for places where frequent operation is required for switching inductive loads.