PFRA.250

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PTC Resettable Fuses are a reliable safety feature found in many electronic devices. The PTC Resettable Fuse ensures that current always flows in the correct direction, protecting expensive and difficult-to-replace components. When the current load exceeds a predetermined level, the fuse will fast and permanently deactivate or trip, shuttering the flow of electrons stopping a dangerous situation. As the current load decreases, the resin inside the fuse will cool, resetting the system and allowing current to flow again.

The PTC Resettable Fuse PFRA.250 is one of the most popular PTC fuses on the market. It is a radial leaded fuse rated at 125VAC with a time-delay of 10s plus or minus 20%. Designed for use in residential appliances, the PFRA.250 is a reliable and efficient choice when looking to protect against current overload and short-circuits. It is also a cost-effective solution as the cost of replacing a blown fuse is significantly less than replacing the entire component system.

The working mechanism of the PFRA.250 begins with the positive temperature coefficient (PTC) element. This element is the heart of the fuse and is made from special thermoplastic material. When current flows through the fuse, the heat generated by the element causes it to expand and its resistance increases exponentially. As the current load increases further, the element’s resistance continues to rapidly increase, eventually breaking the circuit, thus preventing a dangerous overload.

Once the current overload has been eliminated, the PTC Element will begin to cool. This cooling causes a decrease in its resistance and allows current to flow again. The time taken for the fuse to reset depends on the magnitude of the overload and the temperature of the surrounding environment. It usually takes between four and five minutes for the fuse to reset itself at 21°C (70°F).

The PTC Resettable Fuse PFRA.250 is a reliable and efficient fuse that can be used in a wide range of applications. It can be used to protect motors, power supplies, computers, televisions, microwave ovens, air conditioners, and other household appliances. However, because of its time-delay characteristics, it should not be used in applications that require fast tripping times, such as those involving short-circuits.

In summary, the PTC Resettable Fuse PFRA.250 is a safe and cost-effective solution for safeguarding against current overload and short-circuits. It is an ideal choice for safeguarding residential appliances and other household electronics. Its unique time-delay properties allow it to protect against most short-circuits and reset quickly after the overload has been eliminated.

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