Patent ID: 7355139

Claim:
A miniature circuit breaker, comprising: a hollow housing including at least two contact terminals, a first contact terminal and a second contact terminal having a second contact point; an elastic contact piece being a bended strip, whose one end is a fixed end fixed to the first contact terminal and the other end is a free end having a first contact point; and a rod-shaped push button movably inserted in the housing, and contacted with a surface of the elastic contact piece; wherein the elastic contact piece comprises an elastic curved section close to the fixed end thereof; a U-shaped elastic curved section is capable of deforming and resuming an original state after deformation; when the elastic contact piece is heated, the elastic curved section is deformed, thereby making the elastic contact piece extend and deflect; when the elastic contact piece is heated, the elastic curved section deforms to open an angle using an arc center of the elastic curved section as a rotational axis, and the first contact point at the free end of the elastic contact piece moves a distance, thereby separating the first contact point from the second contact point and ensuring the circuit in an OFF state.