| 摘要 |
<p>In order to obtain a vacuum switch for cutting off a single phase alternating current in which a higher insulation performance is achieved and the reliability can be improved the vacuum switch is characterized in comprising three serially connected vacuum valves (VI) designed for three phase alternating current. More specifically the three vacuum valves designed for three phase alternating current are characterized in being connected so that a current flowing through an adjacent vacuum valve flows in the same direction or being connected so that a current flowing through an adjacent vacuum valve flows in a different direction.</p> |
