Patent ID: 7808361
Filing Date: 2010-10-05
Classification: H01H

Abstract:
1. A dual protection device for a circuit, comprising: a cover made of a conductive material and having a first terminal connected thereto; a first protection unit comprising an elastic contact piece and a first conductive member, the elastic contact piece including a first end fixed to the cover and a second end having a first contact point disposed thereon, the elastic contact piece being made of metal, slightly curved, and capable of bending toward two opposite directions due to temperature change, the first conductive member having a second contact point disposed on a top thereof, the first contact point located corresponding to the second contact point; wherein the first contact point contacts with the second contact point when the circuit is in a normal state, the elastic contact piece is deformed and bent toward another direction to separate the first contact point from the second contact point when the elastic contact piece reaches a first predetermined temperature; a second protection unit having a second conductive member, a second terminal, a first fuse member connecting the second conductive member with the first conductive member, a second fuse member connecting the second conductive member with the second terminal and a biasing member having a first end pressing against the second conductive member; when a second predetermined temperature is reached, the first fuse member and the second fuse member melt and the biasing member pushes the second conductive member away from the second terminal; and a base having a recess defined therein so as to receive the first conductive member, the second conductive member and the biasing member in the recess.