MF-RG800-2

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PTC resettable fuses are used to protect electronic circuits from high currents and can be found in everyday electrical products. In this article, we will discuss the application field and working principle of MF-RG800-2, which is one type of resettable fuse.

An MF-RG800-2 is an 8 amp, 125 volt, bi-stable, resettable fuse. It is a polymeric positive temperature coefficient (PPTC) device that employs a proprietary resistor technology to provide both overload and overcurrent protection to equipment. It consists of two components, a polymeric substrate and a tab with two solder points. When the temperature of the polymeric substrate increases, it increases its resistance, thus breaking the circuit. When the temperature returns to normal, the circuit is restored.

The main application field of MF-RG800-2 is as a circuit breaker in consumer electronics such as AC/DC adapters, chargers, power supplies, and other devices. This resettable fuse is also used in industrial applications such as power meters, heaters, and light fixtures. It is designed for current overload protection in low voltage DC or AC applications and is suitable for both indoor and outdoor use.

The working principle of MF-RG800-2 is quite simple. When the current exceeds the rated value of the fuse, the polymeric material in the fuse will heat up due to the Joule heating effect. This increase in temperature causes the resistance of the substrate to rise, and the current is interrupted. When the temperature returns to normal, the resistance decreases and the circuit is then restored.

Additionally, MF-RG800-2 has the advantage of resetting itself after overcurrent or overvoltage stoppage. It is also able to detect short circuits and can signal the user or control system when it is being overloaded. The fuse can also withstand higher peak currents without failing, which is another advantage over ordinary fuses.

In conclusion, the MF-RG800-2 is a 8 amp, 125 volt, bi-stable, resettable fuse designed for current and overvoltage protection in low voltage DC or AC applications. It is capable of resetting itself after overcurrent or overvoltage stoppage, it detects short circuits, and is able to withstand high peak currents without failing. This makes it a popular choice for circuit breaker applications in consumer electronics and industrial applications.

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