| 摘要 |
PROBLEM TO BE SOLVED: To provide a vacuum breaker capable of meeting the requirement for the environmental protection and for improvement of insulation reliability. SOLUTION: A third electrode 8A is brazed on the inner side of a support 1a projecting from the center on the inner side of an insulating cylinder 1A by way of a support clamp 9. The arc generated between a fixed contact 5A and a moving contact 5B when breaking is guided from the periphery of the fixed contact 5A to the movaing contact 5B by way of the third electrode 8A and cut off at two points, so to speak, so that the probability of insulation breaking, especially for a low voltage, be reduced. The third electrode may be used on either one electrode when the conditioning process is applied by exposing the periphery of the electrode from the insulating cylinder.
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