| 摘要 |
A vacuum switch comprises a highly conductive member provided on a back surface of a main electrode. The highly conductive member prevents an arc formed upon breaking a large current from becoming locally concentrated or stagnated, and promotes rapid and smooth movement of the arc from the main electrode to an auxiliary electrode. Marked enhancement and stabilization of the vacuum switch tube performance in breaking a large current, as well as enabling a smaller construction, are thereby realized. The main electrode, auxiliary electrode, and highly conductive member are formed of metal alloy materials selected so that the conductivities sigma a, sigma b, sigma h of the main and auxiliary electrodes and the highly conductive member respectively satisfy the relationship sigma a< sigma b< sigma h.
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