Circuit breaker

A circuit breaker comprising:

• a main circuit contact section having at least one fixed contact shoe, a movable contact shoe situated near the at least one fixed contact shoe, a contact shoe holder for holding the movable contact shoe, and a contact spring for urging the movable contact shoe toward the at least one fixed contact shoe;
• an opening and closing lever located above the main circuit contact section and having a journaled rear end and a tip located at a portion facing a top surface of the contact shoe holder;
• and
• a contact opening and closing mechanism located above the main circuit contact section and having a toggle link linking with the opening and closing lever, an opening and closing handle with a handle lever, an opening and closing spring extending between the handle lever and the toggle link, and a latch linking with the toggle link, wherein said toggle link includes a toggle shaft, a first link having a lower end coupled to the opening and closing lever and an upper end connected to the toggle shaft, and a second link extending between the toggle shaft and the latch as to overlap the first link in a V-form, said opening and closing spring extending between the toggle shaft and a tip of the handle lever coupled to the opening and closing handle to extend downward.