Overcurrent protection assembly

The utility model discloses an overcurrent protection assembly, which makes use of the characteristic that the outsides and the insides of an upper metallic conduction piece and a lower metallic conduction piece have unbalanced coefficient of thermal expansion to form a deforming torsion toward outside; through the torsion, a current detecting unit is torn to present at least one fracture surface, which leads to an effect similar to electrical open circuit of a fuse; consequently, the utility model achieves the purpose of avoiding the accident that the over-current protection assembly is out of work and burned in case to cause short circuit and lead to using danger for any circuit.