NOVELTY - A surface-mounted over-current protection device has conductive composite module (9), metal electrodes (41',42'), and insulating layer (30) provided between metal electrodes (41',42') to electrically insulate metal electrode (41') from metal electrode (42'). The conductive composite module has positive temperature coefficient material layer (10) laminated between metal foils (22',23'), and has resistivity of 2 Omega .cm. The positive temperature coefficient material layer contains conductive filler distributed in crystalline polymer, and has resistivity of 500 mu Omega .cm.    USE - Surface-mounted over-current protection device is used for lithium battery.    ADVANTAGE - The surface-mounted over-current protection device has high resistivity and hold current, and favorable positive temperature coefficient characteristics.    DETAILED DESCRIPTION - A surface-mounted over-current protection device has conductive composite module, metal electrodes (41',42'), and insulating layer provided between metal electrodes (41',42') to electrically insulate metal electrode (41') from metal electrode (42'). The conductive composite module has positive temperature coefficient material layer laminated between metal foils (22',23'), and has resistivity of 2 Omega .cm. The positive temperature coefficient material layer contains conductive filler distributed in crystalline polymer, and has resistivity of 500 mu Omega .cm. The metal electrodes (41',42') are electrically connected to metal foil (22',23'), respectively. The surface-mounted over-current protection device in which hold current value divided by product of covered area and number of conductive composite module, is 0.16-A/mm2 at 25 degrees C.    DESCRIPTION OF DRAWING(S) - The drawing shows schematic view of surface-mounted over-current protection device.    Conductive composite module (9)    Positive temperature coefficient material layer (10)    Metal foils (22',23')    Insulating layer (30)    Metal electrodes (41',42')