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PTC resettable fuses are a type of fuse that are built with a specialized technology, allowing them to reset after a surge or current overload occurs. This style of fuse utilizes a positive temperature coefficient (PTC) thermistor which will trip and disconnect the circuit when the current passing through it passes a certain threshold. This not only protects the components in the circuit, but it also allows for the current to be restored after the surge or overload is no longer present.

The application of PTC resettable fuses is varied and can encompass both high-powered and low-powered equipment. Most commonly these fuses are found in consumer electronics, such as cell phones, computer power supplies, laptop chargers, and gaming consoles. Their low power consumption and fast reset time makes them desirable in these applications, as well as in industrial operations. They are also often used in higher power equipment such as appliances, heaters, and water heaters.

The working principle of a PTC resettable fuse is relatively simple. It utilizes a specialized thermistor that acts as a temperature sensor, which is embedded in the interior of the fuse. This thermistor is what allows the fuse to reset after the current overload has passed, as it monitors the temperature of the internal components and will trip if it becomes too hot. Once the current overload has passed, the thermistor cools off and the fuse automatically resets. This process can take anywhere from a few milliseconds to several minutes, depending on the type of fuse.

PTC resettable fuses offer a number of benefits over traditional fuses, such as cost savings, faster reset times, and longer lifetimes. Not only do these fuses provide reliable and efficient protection from overloads, they are also an inexpensive alternative to traditional fuses and are often much smaller than standard fuse designs. Additionally, they typically reset much faster than traditional fuses, so it makes them great for applications that require a fast response time. Finally, they are also designed to last much longer than traditional fuses, often boasting lifetimes of many hundreds of thousands of hours.

In conclusion, PTC resettable fuses are a reliable and efficient way to protect circuits from overloads. Utilizing an embedded thermistor, these fuses can trip and reset quickly in response to changes in current, while also boasting long lifetimes and smaller designs than traditional fuses. They are most commonly found in consumer electronics and appliances, and can offer cost-savings, faster reset times, and improved lifetimes over more traditional fuse solutions.