PFRA.075.2

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PTC (positive temperature coefficient) resettable fuses are widely used in consumer electronics as a form of external overcurrent protection. The PFRA.075.2 is a self-resettable polymeric fuse which uses the PTC resistor element to protect against shorts, overloads, and overvoltage. In comparison to standard fuses, resettable fuses offer the advantage of resetting automatically and continue to provide protection without the need to replace the fuse. The following sections will cover the application field and working principle of the PFRA.075.2.

Application Field of the PFRA.075.2

The PFRA.075.2 is a PPTC (polymeric positive temperature coefficient) resettable fuse designed for consumer electronics, such as power supplies, adapters, chargers, audio/video players, TVs, battery-powered equipment, etc. It offers an instantaneous response speed of less than one second and has the ability to interrupt high inrush current caused during the start-up of the equipment.

The PFRA.075.2 provides both overcurrent protection and overvoltage protection. Its wide operating temperature range (–55°C to +125°C) allows it to be used in a broad range of applications. The low internal resistance of the fuse (−1.2 mΩ at rated current) reduces heat generation and power loss in the circuit, which makes it highly efficient.

Working Principle of the PFRA.075.2

The PFRA.075.2 has a unique construction featuring a combination of two components: an NTC (negative temperature coefficient) and a PTC (positive temperature coefficient). The NTC resistor is used to detect overvoltages while the PTC resistor is used to detect overcurrents. Both components use different resistive mechanisms to detect and protect these conditions.

When the PFRA.075.2 is exposed to an overcurrent or overvoltage, the NTC resistor and PTC resistor elements go into a fail-safe mode and the device trips, reducing the current and voltage in the circuit. The device then self-resets automatically, allowing the current and voltage to return to normal levels.

The PFRA.075.2 also has the ability to absorb large transients, which is made possible by the combination of the NTC and PTC resistors in the device. This feature makes the PFRA.075.2 an ideal choice for applications that are prone to transients, such as medical equipment and power systems.

In conclusion, the PFRA.075.2 is an excellent choice for applications requiring effective overcurrent and overvoltage protection. It is reliable, cost efficient, and easy to use and integrate into existing systems. The device is highly robust and offers a wide operating temperature range for use in a range of applications.

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