Electrical circuit breaker

An electric circuit breaker, including a housing, a cut portion that is arranged in the housing and forms a part of an electric circuit, a cutting member that cuts the cut portion, and a power source arranged on a first end portion side of the housing,

• the electric circuit breaker comprising a moving body that includes the cutting member and a first arc extinguishing space adjacent to the cutting member, the moving body comprising a space that allows the cut portion to be inserted and accommodated therein by surrounding with an upper wall, a lower wall, and side walls,
• wherein the housing includes a cylindrical portion capable of moving the moving body between the first end portion and a second end portion on a side opposite to the first end portion,
• wherein the moving body is configured such that the cutting member provided in the moving body cuts the cut portion accommodated in the space of the moving body while the moving body moves from the first end portion toward the second end portion by the power source, and the cut portion moves along with the moving body while the cut portion remains accommodated in the space of the moving body, and
• wherein the first arc extinguishing space of the moving body is configured to be located between a separation piece of the cut portion that is cut and separated and a main body portion of the cut portion that remains in the housing without being separated when the moving body moves,
• wherein the first arc extinguishing space does not accommodate the main body portion of the cut portion remained not separated in the housing.