Over-current protection device and protective circuit board containing the same

An over-current protection device adapted to be soldered onto a circuit board and being a rectangular cuboid of an upper surface, a lower surface and four lateral surfaces connecting the upper and lower surfaces, comprising:

• a PTC material layer having opposite first and second surfaces;
• a first electrode foil in physical contact with the first surface of the PTC material layer;
• a second electrode foil disposed at a lower surface of the over-current protection device and electrically connecting to the second surface of the PTC material layer;
• at least one bonding section disposed at a lower surface of the over-current protection device and being separated from the second electrode foil;
• and
• at least one metal connecting member disposed on at least one of the lateral surfaces;
• wherein the second electrode foil is adapted to be soldered onto an electrode section of the circuit board, and the bonding section and metal connecting member connect to at least one joint section of the circuit board by soldering.