TRF250-090UT

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PTC (positive temperature coefficient) resettable fuses are fuses made from a conductive polymer that provides over current protection with a low resistance segment at moderate temperatures which dramatically increases at higher temperatures. TRF250-090UT, specifically, is designed to limit (and eventually cut) the current in an electrical circuit when an excessive current has been detected. This type of overcurrent protection is becoming common in a variety of applications.

TRF250-090UT is a miniature-size, thermosetting, film-based, resettable fuse designed for use in electronic and electrical applications where space is limited. TRF250-090UT is designed to provide over current protection and short circuit protection in cell phones, MP3 players, charging circuitry, portable electronic devices, etc. The circuit has a typical resistance of 0.090 ohms when no current is applied. When the current flows trough the device, its resistance increases to a preset value, which is typically 10-50 times higher than the normal resistance of the device.

The working of TRF250-090UT is based on the principle of a thermistor. A thermistor is a device which changes its resistance with variation in temperature. When current passes through the TRF250-090UT resettable fuse, the device heats up. As it heats up, the resistance to current flow increases, thus reducing the amount of current flowing through it. This results in overheating, and ultimately the melting of polymer in the fuse. At this point, the device switches from its low-resistance state to its high resistance state, which effectively reduces the flow of current.

TRF250-090UT can operate with DC and AC current up to 10 amps maximum at 85°C. It is capable of consuming almost 90% of the full rated current and still remain in a low-resistance state. When the device heats up to 135°C, it will switch to its high resistance state, breaking the current flow and effectively protecting the circuit from further damage. It has a typical response time of 0.2 seconds and a typical hold current of 200 mA. The device is also RoHS and UL certified.

TRF250-090UT offers several advantages over conventional thermal fuses, such as high current capacity, low cost, and a self-resetting mechanism. It is a cost-effective solution for applications requiring reliable short-circuit protection, and it simplifies the circuitry in the design process. It also allows for easy circuit repair or troubleshooting, because it reduces the need for replacing the thermal fuse. With its low self-heating and high reliability, TRF250-090UT is an ideal choice for applications where space is limited.

In conclusion, TRF250-090UT PTC Resettable Fuses are an efficient, reliable, and cost-effective solution for providing overcurrent and short circuit protection in electrical and electronic devices with limited space. It offers a self-resetting mechanism that allows the device to reset itself without manual intervention, and its high current capacity makes it an ideal option for high-heat applications. With its low self heating and UL and RoHS certification, it is one of the most widely-used resettable fuses for consumer electronics.

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