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 including the cutting member,
• 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 a separation piece of the cut portion while the moving body moves from the first end portion toward the second end portion by the power source,
• wherein the housing includes an outer arc extinguishing space on an outer side of the cylindrical portion, and
• wherein the outer arc extinguishing space accommodates a main body portion of the cut portion that remains in the housing without being cut when the cutting member cuts the cut portion, while allowing the main body portion to be inserted through an inside of the outer arc extinguishing space.