Adopting ceramic as a shell, this kind of vacuum interrupter uses vacuum as insulation medium. With smaller volume, this product has got higher voltage-resistance and breaking capacity, together with longer life. Contact terminals are maintenance-free, much safer and reliable. Matching with appropriate operating mechanism, the product can be assembled into high and low voltage vacuum contactors and circuit breakers for power distribution control which are widely used in coal mines, electricity substations, chemical engineering industry, metallurgical industry,  petroleum industry.