PFRT.012.250 Circuit Protection

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PTC resettable fuses are used in a variety of applications which require reliable, cost-effective protection of electronic and electrical components. The protective device works by providing a fuse-like feature (current limiting) that is resetable, using a temperature response of the device. The PTC resettable fuse usually consists of two parts, a PTC (positive temperature coefficient) element and a varistor (variable resistor) element. PFRT.012.250 is one type of PTC resettable fuses often used in industrial and consumer products such as lighting and telecommunications equipment, as well as automotive and marine applications.

PFRT.012.250 has a maximum current rating of 12A and a continuous current rating of 10A. It also has a trip current of 150mA, 125mA, and 100mA. Each trip value has a lower resistance than the other, allowing it to trip at a higher current rating. The PFRT.012.250 also has a hold current of 250mA, which is the maximum amount of current the device can withstand before it starts to trip.

The function of the PFRT.012.250 is to protect and prevent damage to electrical and electronic components from over-temperature or over-current. When the device is exposed to a current flow that exceeds its trip current, the internal temperature of the PTC resettable fuse increases rapidly due to the Joule heating effect. This causes the resistance of the PTC element to increase significantly, which limits the current flow. As heat continues to build up, the temperature of the device increases to a point where the device trips. At this point, the varistor element of the device begins to conduct current, allowing the device to act as an electrical short circuit.

Once the device has tripped, the current flow is heavily restricted, protecting the components in the circuit. The temperature then starts to cool down, and the PTC element begins to reduce its resistance back to its initial value, allowing the device to be reset. This reset process can be manually triggered by pressing a small button on the device, or by simply reducing the amount of current flowing through the device. Once the device has been reset, it is ready to be used again.

The PFRT.012.250 is an ideal device for use in circuit protection applications because it can be used in both high and low current applications. It is also reliable, cost-effective, and simple to use. For these reasons, the PFRT.012.250 is often used in a variety of circuits, such as those used in consumer electronics, automotive and marine applications, as well as telecommunications and lighting equipment.

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