SMD300-2

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PTC Resettable Fuses were originally invented in the 1950’s and have evolved over the years to become a vital component in the modern electrical system. SMD300-2 PTC Resettable Fuses are one of the most frequently used and reliable circuit protection solutions on the market today.

SMD300-2 PTC Resettable Fuses are designed to protect circuits from being overloaded which can lead to electrical fires or other catastrophic events. The concept is simple—the fuse contains a plastic material that will expand when the current levels reach a certain threshold, and then act as an insulator to protect the circuit from further damage. When the current is stabilized, the material will contract and the resistance of the fuse will reset itself.

SMD300-2 PTC Resettable Fuses are primarily used in the automotive industry in a range of applications including airbag, fuel pump, ECU, and other power supplied electronic components. They are also used for computer peripherals such as scanners and printers. Additionally, recent advances have seen them being efficiently used to protect against spikes and surges in electric lines, audio/video systems, and flash memory.

In terms of working principle, SMD300-2 PTC Resettable Fuses are based on the thermistor principle. A thermistor is a conductive material that changes its electrical resistance based on temperature changes. This is made possible by the fact that the material inside the fuse holds the temperature-resistance characteristics of a Positive Temperature Coefficient, or PTC. When the current passes through the component, it will heat the material which will trigger an increase in the electrical resistance. When the current levels exceed the fuse’s rating, the resistance will increase dramatically which will act as a barrier to protect the circuit.

When the current levels decrease, the temperature of the material will also decrease and the electric resistance of the PTC will go back to its original level. This is why SMD300-2 PTC Resettable Fuses are also referred to as self-resetting fuses.

SMD300-2 PTC Resettable Fuses offer several advantages compared to traditional fuses. This type of fuse is capable of automatically resetting itself multiple times and it is also more reliable than traditional fuses since the material inside the fuse can tolerate a higher operating temperature without breaking down. Furthermore, the fuses are relatively cheaper than traditional fuses as they are easy to mass produce.

In conclusion, SMD300-2 PTC Resettable Fuses are a reliable and cost-effective solution for protecting circuits from overloads and surges. The thermistor principle behind these fuses allows them to automatically reset themselves to the original state once the current levels decrease. They are increasingly being used in the automotive industry as well as various other applications.

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