PFRA.110

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PTC (Positive Temperature Coefficient) Resettable Fuses are a type of device made of a semi-conductive polymer. They act as an overcurrent protection device for low-voltage applications. PTC Resettable Fuses typically consist of a PTC resistor element connected in parallel with a metal plate. When the fuse is subjected to a current above its rated current limit, the PTC resistor element will heat up, causing it to enter into a highly resistive state. In doing so, it will effectively create an open circuit which will limit the flow of current, protecting the sensitive components downstream. PFRA.110 is a specific type of PTC Resettable Fuse that is suitable for a variety of applications, including consumer electronics, automotive, and aviation.

The PFRA.110 PTC Resettable Fuse is particularly well-suited for applications that require a high level of reliability, miniaturization, and operational versatility. This fuse offers a maximum rated current of 110A, with a corresponding maximum voltage of 50V. It has a low profile design, making it suitable for applications requiring compact circuit designs. Additionally, the wide operating temperature range of -40 to + 85°C makes it suitable for high temperature and/or environmentally demanding applications.

The working principle of the PFRA.110 PTC Resettable Fuse is based on the passive temperature coefficient curve of the PTC device. This curve defines how the PTC device behaves when exposed to different temperatures. Basically, the PTC device heats up as the current that is flowing through it increases, until reaching a certain temperature. At that temperature, the device’s resistance exponentially increases, providing overcurrent protection. By doing so, the device will effectively reduce the current flow and protect downstream components.

The PFRA.110 PTC Resettable Fuse has a few components that are essential to its working principle. These components are the resistor element, the metal plate, and the fuse holder. The resistor element is connected to the metal plate via a set of soldered tabs. The resistor element is made of a semi-conductive polymer material, which is designed to increase its resistance significantly once it reaches a pre-set temperature. The metal plate is used to conduct electricity, while the fuse holder provides a secure mount point for the fuse.

Lastly, the working principle of the PFRA.110 PTC Resettable Fuse requires a certain amount of activation energy to function correctly. This energy is supplied through the current flow, which will heat up the resistor element in the fuse. As the temperature of the element increases, its resistance also increases, thus limiting the flow of current. This high-resistance state will remain until the current returns to a safe level, at which point the device will reset and the resistor element will return to its original resistance.

In summary, the PFRA.110 PTC Resettable Fuse is a highly reliable device suitable for a wide range of applications, including automotive, consumer electronics, and aviation. Its working principle of utilizing the temperature coefficient curve of the resistor element to provide overcurrent protection is essential for ensuring that sensitive components downstream are not adversely affected.

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