Application of self recovery fuse in overcurrent protection of Industrial internet of things equipment

　　USB ports are increasingly included in Industrial internet of things (IIoT) devices. The data speeds of USB 3.0, 3.1 and 3.2 vary from 5GB/s to 20GB/s. USB protocol can provide bandwidth and reliability required by almost all industrial applications. The USB port provides a connection between the host and IIoT devices for real-time monitoring and control, enabling users to make smarter decisions and improve productivity across multiple processes. Overcurrent and overvoltage in IIoT devices may be caused by power overload, surge, or short circuit, which can generate a large amount of heat and increase the risk of physical damage or electrical fire.

　　self recovery fuses can disconnect the circuit during a fault event like disposable fuses, but they are recoverable, allowing them to achieve longer lifespan of the product. Each fuse is composed of a positive temperature coefficient material, and its internal resistance increases exponentially with increasing operating temperature. The self recovery fuse provides a very high resistance in response to faults such as short circuits or overheating when in action or "tripped" state. This limits the current flowing through the device until the material cools down and then returns to low resistance mode. The device maintains low resistance within a safe range of current.

　　The self-healing fuse adopts compact surface mounting and radial packaging, which can provide reliable overcurrent protection for the communication port of the Industrial internet of things system. They can operate over a wide temperature range and are highly suitable for maximizing the normal operating time of industrial applications, including industrial computers, USB peripherals, smart meters, control devices, and embedded connectors in new Industry 4.0 devices.

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