Electric circuit cut-off device

An electric circuit cut-off device comprising:

• a housing;
• a to-be-cut part that is disposed in the housing and constitutes a part of an electric circuit;
• a power source disposed on a first end portion side of the housing;
• and
• a moving body that moves in the housing between the first end portion and a second end portion on an opposite side of the first end portion;
• wherein
• a fuse including a fusing portion and an arc-extinguishing material, and
• at least one electrode part connected to terminals on both sides of the fuse are provided;
• the moving body is configured such that a part of the moving body cuts a cut piece located between base pieces on both sides of the to-be-cut part while moving from the first end portion toward the second end portion by the power source;
• when the moving body moves toward the second end portion, a part of the to-be-cut part and the electrode part come into contact with each other in a state where base pieces on both sides of the to-be-cut part are energized via the cut piece, and the to-be-cut part and the fuse are connected to each other;
• and
• thereafter, accompanying a movement of the moving body, a state in which the base pieces on both sides of the to-be-cut part are energized via the cut pieces is cut off.