PFRA.300.3 Circuit Protection

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PTC Resettable Fuses are a type of over current protection devices used to protect circuits and devices from over current damage. They are a break-before-make type of fuse, and the most common type is the PFRA.300.3, which features a polymeric Positive Temperature Coefficient Resettable Fuse. These fuses are available in a wide range of package sizes, current surge ratings, and operating temperatures.

The PFRA.300.3 is a single-pole, high-current fuse designed to be used both as a main fuse, and as an additional fuse for enhanced protection. This type of fuse features a polymeric Positive Temperature Coefficient Resettable Fuse (PTCR) with a trip current of 1.3A. It is designed to trip off and reset itself after a short time period if an overload situation arises. The resetting is triggered when the over current situation stops and the temperature of the fuse drops below its normal operating temperature. The temperature of the device is kept in check due to the construction of the fuse, which consists of a thin disc made of a special polymer that offers very good thermal conduction.

Unlike conventional fuses, this type of PTC Resettable Fuse does not need to be replaced after every overload situation. Due to its design, it can be reused many times if the overload situation is not too severe. This makes it an ideal solution for applications that require over current protection, such as DC motors, AC motors, computer systems, and automotive electrical systems.

The working principle of the PFRA.300.3 is quite simple. When an overload situation arises, the temperature of the fuse increases, which causes the polymer disc to expand. This in turn triggers the internal electrical contacts, which open the circuit and cut off the current flow. The reset is triggered when the temperature of the fuse goes back down, which causes the polymer disc to contract and close the circuit, thus allowing the flow of current once again.

The PTC Resettable Fuse can be applied in a wide variety of applications, such as protecting high power loads, controlling voltage and current in DC motors, preventing the occurrence of short circuits, and protecting computers from voltage fluctuations or power surges. It is also commonly used in home electronics applications, such as surge protection for TVs, computers, and home entertainment systems. The PFRA.300.3 is certified for use in many hazardous locations, including UL and C-UL listed equipment.

The PFRA.300.3 is a reliable, low-cost, and efficient way to protect devices and circuits from the dangerous effects of over current conditions. It is a safe and cost-effective alternative to traditional fuse systems, and its resettable character eliminates the need for costly emergency repairs or replacements. Its broad range of applications, reliability, and efficient working principle make it an ideal solution for commercial and residential applications.

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