| 主权项 |
1. An over-current protection device, comprising:
a PTC material layer having a first surface, a second surface, a first lateral surface and a second lateral surface, the second surface being opposite to the first surface, and the second lateral surface being opposite to the first lateral surface; a first electrode layer in physical contact with the first surface of the PTC material layer and extending to the first lateral surface; a second electrode layer in physical contact with the first surface of the PTC material layer and extending to the second lateral surface, the second electrode layer being insulated from the first electrode layer by a first separation; and a third electrode layer being a continuous single member in direct contact with the second surface of the PTC material layer and extending across the first separation; wherein the first, second and third electrode layers and the PTC material layer extend parallel with one another to form a laminate structure, and the third electrode layer has a portion overlapping the first and second electrode layers to form a circuit containing two PTC thermistors in serial connection; wherein the first electrode layer and the second electrode layer are substantially bilaterally symmetrical to each other, and serve as interfaces for current flowing in and out of the over-current protection device, respectively; wherein current flows in and out of the over-current protection device through a path of the first electrode layer, the PTC material layer, the third electrode layer, the PTC material layer and the second electrode layer in order when the over-current protection device is in use. |
