Protection element

The utility model discloses a protection element, protection element include insulation substrate, install the first terminal, second terminal, spring leaf, bimetallic strip on insulation substrate, be located the bimetallic strip below and all the time with the PPTC of bimetallic strip contact, the third terminal and the heat -generating body that are located the insulation substrate bottom stillhave, through bimetallic strip control spring piece and the first terminal lug connection or disconnection, when making the bimetallic strip temperature rise after bimetallic strip self temperature is perhaps generated heat through the heat -generating body simultaneously, bimetallic strip control spring piece and the first terminal disconnection to make this protection element overflow, the homoenergetic enough makes spring leaf and the disconnection of second terminal and makes the first terminal must pass through PPTC with electric connection the between the second terminal when excessivepressure, excess temperatu