Vacuum circuit interrupter.

摘要

A vaccum circuit interrupter comprising in a vacuum vessel 12 at least a pair of a separable stationary electrode 7 and a movable electrode 10, and a main shield 13 concentrically surrounding the electrodes. The main shield has a large-diameter central portion and small-diameter portions at opposite ends. The axial length L of the large-diameter portion of the main shield is the length expressed by : <MATH> where, DIAMETER 2 = inner diameter of the large-diameter portion of main shield, and DIAMETER 1 = outer diameter of the electrode. The taper angle from the large-diameter portion to the small-diameter portion is selected to be 80 DEG SIMILAR 100 DEG .