SPFJ125.X

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SPFJ125.X are speciality fuses used in electrical systems. They serve as an overcurrent protection device that protects the wiring and components in a circuit from overcurrents resulting from overloads, short circuits, and high inrush currents.

The SPFJ125.X has a number of applications such as electronic protection from falling voltage, reverse feed protection, reverse feed power bridge protection, surge capacitor protection, and electromagnetic interference (EMI). They are also used as isolators that allow disconnection of the circuit in the event of an overcurrent. The SPFJ125.X is an ideal protection device for applications such as high frequency switching, low voltage inductive switching, and extreme conduction of DC current.

The primary workings of the SPFJ125.X are based on a thermosetting polymer system and a high temperature fusible alloy. A thermosetting polymer system constantly monitors the inrush current and amperage and will open the circuit when the pre-set current is exceeded. The high temperature fusible alloy triggers the device to open the circuit at a temperature of around 200°C, ensuring complete protection.

The SPFJ125.X follows a simple accepted formula to determine its current rating. The current rating is equal to the ampacity of the conductor multiplied by the safety factor. The safety factor should be taken into consideration when setting the current rating of the SPFJ125.X, depending on the application. It is also important to consider the environmental conditions of the application and select the appropriate fuse for the application. This will ensure that the device is suitable for the intended application and will provide the necessary protection.

For high inrush current applications the SPFJ125.X is often used in conjunction with a time-delay fuse. This adds a delay to the opening of the circuit and helps to reduce the peak inrush current. This is typically used for applications such as inductive switches, motors, transformers, and capacitors.

The SPFJ125.X is also available in a range of sizes including fast, very fast, and ultra-fast-acting. Fast Acting fuses are used for low inrush current applications and will open in a few milliseconds. Very fast and Ultra-fast Acting fuses open in microseconds and are suited for high inrush current applications.

The SPFJ125.X is a reliable protection device that is designed for a range of electrical applications. It is important to choose the right fuse for each application to ensure that the circuit is adequately protected from overcurrents and short circuits. A time-delay fuse can be used for high inrush current applications, and a range of sizes are available to suit the specific needs of each application.

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