AHRF750-2 Circuit Protection

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PTC resettable fuses are devices that protect electronic systems from damage due to overcurrents, using a combination of a thermal-magnetic element and an electrically controlled molecular switch. The AHRF750-2 is a new type of such fuse, designed for mobile device applications. In this article, we’ll go over the application fields and working principle of the AHRF750-2.

Application Field

The AHRF750-2 fuse is designed for use in smartphones, laptops, other mobile devices, and Internet of Things (IoT) applications. Since it is a relatively small size, it fits in most form factors. It is also very reliable, with a 100% current trip and reset rate.

Working Principle

PTC resettable fuse works on the principle of a thermal-magnetic element and an electrically-controlled molecular switch combined. The thermal-magnetic element has resistance decreases as current increases. This resistance decrease causes the temperature of the element to increase, eventually melting the fusible element. This will cause the over-current to shut off. Additionally, when the current flow drops below the trip level, a molecular switch allows current to flow again, resetting the fuse.

To prevent continuous on/off cycling due to momentary over-currents, the switch is designed to be non-conductive until the current is below the reset level for a specific amount of time. This ensures the fuse will not continuously cycle on and off, avoiding damage to the circuit.

Conclusion

The AHRF750-2 PTC resettable fuse is an outstandingly reliable device for protection of electronic systems from over-currents. It is small in size, making it ideal for mobile applications and IoT devices. The working principle of the fuse is simple and effective, and can reliably protect the circuit from damage by over-currents. The AHRF750-2 is an ideal choice for any application that needs reliable protection from over-currents.

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