Vacuum interrupters for contactors are used for long-distance, frequent connection and disconnection of AC main circuits and large-capacity control circuits of electrical appliances. For example, they are used in coal mines, chemical industry, metallurgy, cement and other industries with explosion-proof, corrosion-proof and fire-proof requirements as well as in places with harsher environments. The advantage of the vacuum contactor is that it can be operated frequently to play a control role, but also to open the short-circuit current, for short-circuit protection. The vacuum interrupter chamber for Hongfa contactors adopts the once-sealed row process, which has the characteristics of high vacuum, good insulation strength, low cut-off value and long life.