PFRA.020.2 Circuit Protection

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PTC Resettable Fuses, such as the PFRA.020.2, are primarily used to achieve overcurrent protection in electric circuit systems. They are typically used as a circuit interrupter or short-circuit protection device to help prevent catastrophic damage and prevent electrical fires from breaking out due to overloaded circuits. To ensure that the fuse operates correctly, it must be installed correctly. Depending on the specific application, the physical characteristics and performance levels must also meet the particular application requirements.

PFRA.020.2 resettable fuses combine polymeric positive temperature coefficient (PPTC) technology with a standard fuse construction, which allows the fuse to "sense" fault currents and interrupt the circuit when a predetermined current is exceeded. Once the fault is removed and a low residual current is present, the fuse will automatically reset and begin to conduct electricity again without having to be replaced.

When the PFRA.020.2 device is exposed to an over-current situation, the current passes through the thermistor section of the device which then heats up and begins to expand. Once a predetermined current level is reached, the increased heat causes the thermistor to abruptly expand, opening up the connection and interrupting the circuit. The current is then lowered back to a safe level, allowing the device to cool and reset. This resetting action allows the circuit to resume its normal operation and the device is protected from further overload damage.

These types of resettable fuses are generally used in low voltage applications in consumer electronics, automotive, computer and IT equipment, as well as in transformer and surge protection circuits. Additionally, the PFRA.020.2 can be used in AC and DC circuits and is particularly suited for small space components, such as in power strips, small UPS systems, and even home security systems.

The features and advantages of the PFRA.020.2 resettable fuse include a fast response time, high dielectric strength, simple installation, and a strong non-conductive construction. The fuse is also highly reliable and can be used in both low voltage and high voltage applications. The maximum rated voltage and current of the PFRA.020.2 is 125V and 20A respectively.

In summary, the PFRA.020.2 resettable fuse is a popular and reliable device for providing over-current protection for electric circuits. It combines PTC technology with a standard fuse construction and is suitable for most low voltage applications. It has the advantages of fast response time, high dielectric strength, simple installation, and strong non-conductive construction. The PFRA.020.2 is also highly reliable, offering maximum rated voltages and currents up to 125V and 20A respectively.

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