Circuit protection element

A circuit protection element formed by bending a metal plate and used on a circuit board after being mounted thereon in a state retaining an elastic stress caused by elastically deforming a part thereof after mounted so as to be used to break a circuit by releasing the elastic stress during operation, comprising:

• a vertical wall serving as a bending reference plane substantially perpendicular to a mounting surface of the circuit board in a mounted state;
• a first mounting part formed by being bent from a first end part of the vertical wall once with respect to the bending reference plane and substantially parallel to the mounting surface of the circuit board;
• a second mounting part formed by being bent from a second end part, different from the first end part, of the vertical wall once with respect to the bending reference plane and substantially parallel to the mounting surface of the circuit board;
• an elastic deformation part formed to project from the vertical wall in a predetermined direction, which has a contact part in the vicinity of an end part thereof on an opposite side to the vertical wall and accumulates an elastic force caused by elastic deformation thereof;
• and
• a self-locking part formed on the vertical wall for maintaining the elastic deformation part in a state elastically deformed.