Patent ID: 8461956

Claim:
An over-current protection device, comprising: a first conductive member comprising a first electrode foil and a second electrode foil, wherein the first electrode foil and the second electrode foil are formed on a same plane; a second conductive member; a resistive device exhibiting positive temperature coefficient or negative temperature coefficient and being laminated between the first conductive member and the second conductive member; and a temperature sensing switch configured to switch the first electrode foil and the second electrode foil between conductive status and current-restriction status according to temperature variation; wherein a threshold temperature of the temperature sensing switch is lower than a trip temperature of the resistive device; when the temperature sensing switch is in conductive status, current goes through a conductive path of the first electrode foil, the resistive device and the second conductive member and a conductive path of the second electrode foil, the resistive device and the second conductive member; when over-current occurs in the conductive paths, the resistive device is tripped from low resistance status to high resistance status for over-current protection; when the over-current is gone, the resistive device is returned to low resistance status; when a temperature of the temperature sensing switch exceeds the threshold temperature, the temperature sensing switch is switched to current-restriction status, current instantly goes through a conductive path of the first electrode foil, the resistive device and the second conductive member and generates heat to trip the resistive device from low resistance to high resistance status; when the temperature is decreased to below the threshold temperature, the resistive device is returned to low resistance status.