MF-R700

PTC Resettable Fuses: MF-R700 Application Field and Working Principle

Polymeric Positive Temperature Coefficient (PPTC) or PTC resettable fuses, such as MF-R700, are vital components used to protect electronic equipment from electrical overcurrents and short circuits. In addition to their wide range of application areas, these fuses also have many advantages compared to traditional fuses. This article aims to provide a comprehensive insight into the application field and working principle of MF-R700.

Application Field of MF-R700

MF-R700, part of PTC Resettable Fuses of Multi Fuses brand, are used in many different applications including industrial equipment, AV equipment, consumer electronics, office automation, automobiles and tools. These fuses do not require manual resetting; they are designed to automatically reset after a fault has been cleared. This feature makes it ideal for use in applications where resetting needs to be avoided.

Working Principle of MF-R700

The working principle of MF-R700 is based on the PTC resettable fuse technology. This technology employs a positive temperature coefficient material that has a higher resistance in its cold state and a lower resistance in its hot state. When an overcurrent flows through the fuse, the PTC material heats up and causes its resistance to increase, interrupting the circuit. After the current is interrupted, the PTC element cools and its resistance reduces, allowing the circuit to be reset.

MF-R700 has two distinct temperature ratings; the Holding Temperature and the Trip Temperature. The Holding Temperature is the temperature at which the fuse will remain in its low resistance (ON) state and allow current to flow through the circuit. The Trip Temperature is the temperature at which the fuse will go into its high resistance (OFF) state and interrupt the current flow. The difference between the two temperatures determines the current that the fuse can handle.

Conclusion

MF-R700, part of PTC Resettable Fuses series of Multi Fuses brand, offers users many advantages in comparison to traditional fuses, and thus has found use in many applications. In addition, it is designed based on the PTC resettable fuse technology that increases its resistance when subjected to electrical overcurrents and then automatically resets after the fault has been cleared. Overall, MF-R700 is an important component for protecting electronic equipment against electrical overcurrents and short circuits.