Vacuum interrupter.

摘要

An inventive vacuum interrupter exhibits a high interruption performance. The interrupter includes a metal end plate (4) constituting part of its vacuum envelope (1), and a coil (10) disposed outside the vacuum envelope (1) and near the metal end plate (4) and generating an axial magnetic field parallel to a path of an arc in an arcing gap between a pair of separable contact (8, 9) within the vacuum envelope (1). The contact (8) near the coil (10) is made of a material superior in interruption performance to the end plate (4) and is mounted with a clearance onto the end plate (4). The clearance is at least 2 mm and at most 30% of the diameter of the coil-side contact (8).