Vacuum circuit breaker

A vacuum circuit breaker comprising:

• a grounded tank;
• a vacuum chamber disposed in the grounded tank;
• an insulating tube disposed between one side end surface inside the grounded tank and one side end surface outside the vacuum chamber;
• a fixed rod inserted into the vacuum chamber;
• a fixed-side electrode disposed in the vacuum chamber at one end of the fixed rod;
• a movable-side electrode disposed in the vacuum chamber so as to face the fixed-side electrode;
• a movable rod partially disposed in the insulating tube and having one end with the movable-side electrode disposed thereon;
• a slider disposed on the movable rod so as to slide in the insulating tube;
• a first partition wall in the insulating tube between one side end surface of the grounded tank and the slider;
• a contact pressure spring disposed at the movable rod between the one side end surface of the grounded tank and the slider.