PFRT.008.250 Circuit Protection

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PTC resettable fuses are becoming increasingly popular in modern electronics due to their ability to protect against over-current and over-temperature events. PTC resettable fuses are made up of two components; an initial resistor and a thermal switch. After a certain amount of current is passed through the circuit, a preset trigger voltage is reached and the thermal switch is activated, then the current is shut off. The advantage of using a PTC resettable fuse over conventional fuses is that it can bereset, allowing current to be restored to the circuit after a brief cooling period.

PFRT.008.250 is a member of the PTC resettable fuse family. It is a surface mount device typically used in high-temperature applications such as automotive or telecom applications. It consists of a ceramic body, a PTC element, a metal contact, and a striker pin. The PTC element is made from an electrically-conductive ceramic material, which has a stable resistance at room temperature. When triggered by a predetermined current, the PTC element heats up, increasing its resistance, and consequently, breaking the circuit.

The working principle of PFRT.008.250 is quite simple. When the rated current of PFRT.008.250 is passed through it, the resistance of the PTC element increases, raising its temperature significantly. When the temperature of the PTC element reaches 125°C, its resistance increases rapidly, causing the circuit to be broken. When the current is reduced to a low level, the PTC element will cool down and return to its stable resistance state, restoring the circuit.

PFRT.008.250 is well suited for applications where over-current, over-temperature, and short circuit protection are critical. It is an ideal solution for high power applications such as telecom cabinets, electric motors, and heavy-duty automotive circuit boards where traditional fuse protection may not be adequate. PFRT.008.250 can also offer voltage protection in applications where the load does not exceed 125°C.

In conclusion, PFRT.008.250 is an excellent addition to the PTC resettable fuses family, offering superior performance and protection in high temperature and high power applications. It is ideal for automotive, telecom, and other industrial applications where over-current, over-temperature, and voltage protection are needed.

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