Patent ID: 8854782

Claim:
An overcurrent protection device, comprising: at least one power input terminal electrically connected to a power supply, at least one power output terminal electrically connected to a computer motherboard, a first signal terminal electrically connected to the power supply, a second signal terminal electrically connected to the computer motherboard, wherein when a user inputs a power-on instruction using the second signal terminal, the first signal terminal and the second signal terminal are electrically connected to each other, causing the power supply to start to work, and if the first terminal and the second terminals are disconnected from each other when the computer motherboard works, the power supply stops working; a testing circuit comprising a fixed resistor and a control chip which are parallel electrically connected between the power input terminal and the power output terminal, the control chip storing a predetermined voltage threshold, and configured for detecting voltage between the two terminals of the fixed resistor, and comparing the measured voltage with the predetermined voltage threshold; and a switch element configured for disconnecting the first signal terminal and the second signal terminal when the measured voltage is greater than the predetermined voltage threshold.