Bimetal plate laminated thereon positive temperature coefficient material layer and Device of blocking over current in electrical circuit using the same

摘要

The present invention relates to a bimetal plate bonded to a positive temperature coefficient (PTC) material layer and an overcurrent blocking device using the same. The bimetal plate according to the present invention includes first and second metal layers having different thermal expansion coefficients and facing each other, and a PTC material layer directly bonded on the first or second metal layers. In addition, the overcurrent blocking device according to the present invention is connected to the electrical circuit between the power supply and the load to block the supply of the overcurrent to the load, the bimetal plate, the upper and lower contacts for performing a switching operation for blocking the overcurrent And overcurrent is generated in the electrical circuit, the contact between the upper contact point and the lower contact point is released due to the bending of the bimetal plate, and thereafter, the PTC material layer generates Joule heat due to leakage current. By continuously maintaining the bent state, it is characterized in that the repetitive trip (cycling trip) phenomenon is essentially blocked.