B59840C0080A070

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PTC resettable fuses, commonly referred to as polyfuses, are passive electronic components whose primary purpose is to protect circuits from current overloads, short circuits, and other potentially damaging electrical malfunctions. The B59840C0080A070 resettable fuse is among the most common varieties. It is a Type II, two-winding device designed to provide additional protection for sensitive electronic components.

In normal operating conditions, the current passing through the B59840C0080A070 resettable fuse remains within its specified current rating. However, when an overload appears, the fuse will open the circuit, and the temperature of the fuse will increase to a point where the fuse reset phase begins. The reset phase will begin as soon as the external current is decreased to a safe level, and the internal temperature of the fuse falls below a certain level. Once the reset phase is complete, the fuse will be ‘reset’ and functioning once again.

The primary application for a B59840C0080A070 resettable fuse is non-critical, low-power circuits or systems where the device can be used to protect against current surges, shorts, or other minor faults. It is mainly used to protect PC peripherals such as USB ports, PCs, laptops, printers, and other such equipment. They are also suitable for consumer electronic devices, such as mobile phones.

The working principle of the B59840C0080A070 resettable fuse is relatively simple. It is basically an up-down voltage scaling or thermal mechanism. As the current increases, the up-scaling voltage heats up the bimetal strip and reduces the contact resistance, which in turn increases the current. At a certain current level (specified by the manufacturer), the bimetal strip snaps open, and the current is cutoff. When the current is reduced to a safe level, the bimetal strip cools down and snaps back, restoring the contact between the two terminals and restoring the circuit.

In conclusion, the B59840C0080A070 resettable fuse is a very useful component in the protection of sensitive electronics. It is mainly used in non-critical, low-power circuits or systems where it can protect against current surges, shorts, or other minor faults. Its working principle is based on up-down voltage scaling or thermal mechanisms, where it opens the circuit when the current exceeds a certain threshold, and resets the circuit when the current falls below that threshold.

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