PFRA.025.3

PTC Resettable Fuses

PTC resettable fuses, also known as polyfuse or polyswitch, are self-regulating, temperature-sensitive thermistors that serve as an over-current protection device in electrical circuits. They are designed to protect against dangerous short-circuits as well as other over-current situations. PTC resettable fuses are widely used in applications such as electrical motors, consumer electronics, automotive, and power recording equipment.

PFRA.025.3 resettable fuses are surface mount devices that provide over-current and short-circuit protection. It provides over-current protection for current peaks up to 25A and is suitable for continuous current ranging from 0.7A to 10A. The PFRA.025.3 fuse features a unique polyswitch technology which effectively and reliably detects and shuts off current when an over-current situation occurs. The fuse automatically resets itself after the fault has been cleared and the current returns to a safe level.

Application Field

The PFRA.025.3 resettable fuse is well suited for applications involving sensitive electronic components. its compact design allows it to be easily installed in electronic circuits and provides space-saving advantages. Its temperature-sensitive design ensures that it triggers when there is a risk of current over-pressure or over-temperature. Compared to conventional circuit breakers, it offers better current flow generation and faster response times. Additionally, the PFRA.025.3 resettable fuse also has lower power dissipation and a low resistance value.

The PFRA.025.3 resettable fuse can be used in applications such as power supplies, refrigerators, air-conditioners, televisions, washing machines, battery banks, portable computers, electric vehicles, and other electrical and consumer electronics.

Working Principle

The PFRA.025.3 resettable fuse uses a unique polyswitch technology to ensure reliable and effective over-current protection. The polyswitch is composed of a PTC element which has two functions. First, it acts as a temperature-sensitive resistor. Secondly, it acts as a self-regulating switching device.

When the operating current rises above the threshold level, the PTC element begins to generate heat which causes an increase in the resistance of the element. This results in a decrease in current flow which effectively reduces the risk of a short circuit. When the current returns to a safe level, the PTC element begins to cool down and the resistance decreases back to its original level, allowing the fuse to reset automatically.

The PFRA.025.3 resettable fuse also has an adjustable reset current value. This value is the maximum current that the fuse will tolerate before triggering the shutdown process. This feature allows users to customize the protection levels of their circuits according to their specific requirements.

Conclusion

The PFRA.025.3 resettable fuse provides reliable and effective over-current protection for a wide range of applications. It utilizes a unique polyswitch technology to detect and shut off current when an over-current situation occurs. Additionally, it also has an adjustable reset current value which allows users to customize their protection levels. Overall, the PFRA.025.3 fuse is an ideal solution for electrical and consumer electronics applications.