TRF250-183-2 Circuit Protection

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PTC Resettable Fuses

PTC resettable fuses, or polymeric positive temperature coefficient (PPTC) devices, are used in a wide range of applications, including consumer electronics, telecommunications, household appliances, automotive, and renewable energy applications. The TRF250-183-2 device is a typical example of a PTC resettable fuse. This article will discuss the application field and working principle of the TRF250-183-2.

Application Field

TRF250-183-2 devices are small, low-cost, area-saving fuses that provide over-current protection in small electronic devices. The device is designed to be suitable for a wide range of applications, including telecommunication, consumer electronics, automotive, industrial, and renewable energy applications. It has a low power dissipation down to 250 mW, which makes it suitable for battery operation. The device also has a wide operating temperature range of -40°C to +105°C, which makes it suitable for high temperature applications.

The TRF250-183-2 device is also designed to be RoHS/WEEE compliant with a wide operating current range from 0.6 A to 5 A. This makes it suitable for both high and low-power applications. The device also has a low resistance, which allows for the optimization of the current carrying capacity. Additionally, the device is ESD protected with an IEC 61000-4-2 level 4 discharge rating.

Working Principle

The TRF250-183-2 device works by sensing the current flowing through it and tripping when the current rises above the predetermined level. The device is designed to recover reliably when the current drops below the trip current, ensuring longer product life and improved safety. The device is constructed with a special polymeric material that works as a resistive element. This material is heated by the current flowing through it and acts as a thermo-switch that trips when the current gets too high.

The PTC resettable fuse operates when the current increases above the set trip value. When this occurs, the material will heat up quickly and reach a temperature at which it will open the circuit. As the current decreases, the device will cool down and return to its original low resistance state allowing the flow of current to resume. This process can be repeated until the device has reached its maximum trip count, at which point the device will fail open and can no longer be used.

Conclusion

In conclusion, the TRF250-183-2 device is a PTC resettable fuse designed for small electronic devices. It is ideal for applications with wide temperature ranges and low power dissipation. The device is RoHS/WEEE compliant with a low resistance that allows for higher current carrying capacity. Lastly, the device works by tripping when the current rises above the predetermined level and recovering when the current falls below the trip point.

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