VACUUM INTERRUPTER

摘要

A vacuum interrupter a vacuum envelope of which including in the main a cylindrical metallic housing with at least one end opening and a disc-shaped and aperture insulating end plate of insulating ceramics which is hermetically sealed to the opening end of the housing. A metallized layer to which the opening end of the housing is hermetically brazed is in an outer-diameter region of a sealing surface of the plate, while another metallized layer to which other metallic members of the envelope is hermetically brazed is in an inner-diameter region of the plate. There is provided near at least either of two spaced edges appearing within the envelope of the innerdiameter side and outer-diameter side metallized layers a metallized-layer-edge shield to prevent the occurrence of electric field concentration. The shield much increases the internal dielectric strength of the envelope.