PFRA.075.3

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Introduction to PTC Resettable Fuses

Polymeric Positive Temperature Coefficient (PTC) resettable fuses are an increasingly popular method of protecting electronic devices against over-current power surges. Developed in the late 1980s, PTC resettable fuses use a unique design that fundamentally changes the way in which they react to increasing currents. PTCs enter a high-resistance state if they detect a current higher than their rated current, and this high resistance drastically reduces the amount of heat that is generated. This heat reduction allows them to be reset by simply providing them with a much lower current, and after a few seconds, they reset and are ready to protect once again.

PTC Resettable Fuse Application Field

PTC resettabl fuses are being used in a wide range of applications, from residential and commercial power supplies, to automotive applications, medical devices and even in military applications. These resettable fuses are designed to provide efficient, reliable and cost-effective protection to sensitive electronic components. They are widely used to protect against over-current events, providing superior protection when compared with traditional fuses and circuit breakers.

In Power Supplies, PTC resettable fuses are used to protect the power supply against excessive current, protecting the equipment and data against permanent damage that could occur if an over-current condition is sustained for too long. PTC resettable fuses are also used in conjunction with circuit breakers in automotive and military applications, where they provide reliable protection without the need to reset breakers manually. Finally, PTC resettable fuses are often used in medical devices, where they protect sensitive circuits from the effects of over-current events.

Working Principles of PTC Resettable Fuses

The working principle behind PTC resettable fuses is based on the phenomenon known as "positive temperature coefficient", or PTC. Basically, as the current passing through the fuse increases, so does the temperature of the wire inside the fuse. This temperature rise is detected by a thermal element inside the fuse, which increases its electrical resistance. This increased resistance is what eventually causes the fuse to trip and reduce the current passing through it.

When the current passing through the PTC resettable fuse is reduced to a safe level, the temperature of the wire inside the fuse drops and so does the resistance. At this point, the fuse will automatically reset, allowing current to flow again. The PTC resettable fuse provides a fast and reliable way of protecting the device against excessive current. Compared to traditional fuses, PTCs provide superior protection, provide cycle after cycle of reset ability and are cost effective.

Conclusion

PTC resettable fuses are an increasingly popular method of protecting electronic devices from over-current power surges. PTCs have a faster response time and provide superior protection than traditional fuses, making them well suited for a wide range of applications, from residential and commercial power supplies, to automotive, medical and military applications. Understanding how PTCs work is important to take advantage of their features and ensure that your device is protected from over-current events.

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