Vacuum interrupter

A vacuum interrupter comprising:

• a hollow insulated container having opened top and bottom;
• a seal cup installed on an upper end of the insulated container;
• a fixing electrode including a fixing shaft having one end fixed to the seal cup and the other end disposed within the insulated container, and a fixing contact member installed on the other end of the fixing shaft;
• at least one diaphragm installed on a lower end of the insulated container to seal an interior of the insulated container, and formed stretchably in a vertical direction, wherein the diaphragm is not a bellows;
• a movable electrode including a movable shaft having one end fixed to the diaphragm and the other end disposed within the insulated container and formed to be linearly movable, and a movable contact member installed on the other end of the movable shaft to be selectively contacted to the fixing contact member, wherein the diaphragm is formed in a disc form of a concave and convex shape having an opened center;
• and
• a guide member disposed within the insulated container, wherein the guide member includes:
• a body part having a guide hole into which the movable shaft is inserted;
• and
• a protrusion extending outwardly from a lower end portion of the body part,
• wherein a first end of the diaphragm is coupled to a top surface of the protrusion, which prevents the movable shaft from moving in a horizontal direction,
• wherein the diaphragm is installed on the insulated container using a separate connection member, and
• wherein a step is formed on an outer circumference surface of the movable shaft.