Vacuum interrupter

A vacuum interrupter comprising:

• a vacuum container which includes an insulation tube made of ceramics and having openings at both ends thereof, and sealing metals for hermetically sealing said openings respectively;
• and
• a pair of contacts which are disposed in said vacuum container so that these contacts can contact detachably to each other;
• wherein the composition of the material constituting at least one of said sealing metals comprises 25 to 55 wt % of Ni, 0.02 to 1.0 wt % of Si, 5.0 wt % or less in total of Fe and Co, and substantially the residual content of Cu.

A vacuum interrupter comprising:

• a vacuum container which includes an insulation tube made of ceramics and having openings at both ends thereof, and sealing metals for hermetically sealing said openings respectively;
• and
• a pair of contacts which are disposed in said vacuum container so that these contacts can contact detachably to each other;
• wherein the composition of the material constituting at least one of said sealing metals comprises 25 to 55 wt % of Ni, 0.02 to 1.0 wt % of Si, 0.02 to 1.5 wt % in total of Si and Mn, and substantially the residual content of Cu.

A vacuum interrupter comprising:

• a vacuum container which includes an insulation tube made of ceramics and having openings at both ends thereof, and sealing metals for hermetically sealing said openings respectively;
• and
• a pair of contacts which are disposed in said vacuum container so that these contacts can contact detachably to each other;
• wherein the composition of the material constituting at least one of said sealing metals comprises 25 to 55 wt % of Ni, 0.02 to 1.0 wt % of Si, 0.02 to 1.5 wt % in total of Si and Mn, 5.0 wt % or less in total of Fe and Co, and substantially the residual content of Cu.