MF-R800

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PTC Resettable Fuses, or Polyfuse, are unique as they are able to reset automatically after a power surge or current excess. MF-R800 is an example of such devices. It is a popular form of resettable fuse, and widely used in consumer, industrial, automotive, medical and aerospace/defence industries.

The MF-R800’s working principle is based on a polymer technology using a ceramic-filled organosilicon resin on a plastic substrate. It is a self-resetting device, meaning that it will resume its intended current-carrying capacity after a thermal event occurs. This happens when the device it is connected to experiences an over-current condition, causing the internal resistor to heat up and reduce the current flow.

During normal operation, the device’s resistance stays low, allowing current to flow according to the design specification. But when the current rises to a certain level, the internal resistance of the device increases significantly. This causes the internal temperature to rise, creating a “thermal runaway reaction,” which limits the current that can pass through the device.

MF-R800 applications vary depending on the features it provides, such as its compact size, low profile, and high inrush capability. It is often used in equipment, such as in computers, cell phones, audio-visual equipment, battery packs, power adapters, motor control systems, and other applications that require over-current protection.

For automotive applications, the MF-R800 is used in electronic control units (ECUs) to protect sensitive output drivers and low-voltage applications in warning systems and electronic assemblies. In medical devices, it is used to protect systems from dangerous or sudden power surges caused by medical equipment, such as defibrillators and power cords. For aerospace/defence applications, it is used to protect against anomalies caused by lightning strikes, electromagnetic interference, and other power surges.

Overall, the PTC Polyfuse MF-R800 offers a range of advantages in its use. Its compact size and low profile make it suitable for various applications, and its ability to reset automatically is beneficial in many situations. The device can also withstand high inrush current and long-term high-current operation, making it a suitable over-current protection solution for many applications.

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