TRF250-120T-2 Circuit Protection

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Resettable fuses, also known as polymeric system fuses (PPTC) or polymeric positive temperature coefficient (PPTC) devices, are devices that use solid-state ferroelectric polymers as their temperature-dependent resistive element. As a class, these fuses have a wide variety of applications and can be used as circuit protection, overvoltage protection, current surveillance, overcurrent protection, and temperature monitoring. TRF250-120T-2 is one type of PPTC fuse and its application field and working principle will be discussed in this paper.

The TRF250-120T-2 is a commercial, automotive grade, RoHS compliant, resettable current fuse specifically designed for automotive, industrial and consumer applications, with a wide range of operating current ratings from 0.3A to 20A. It is a self-recovering protective device designed to protect circuits from over-currents or short-circuits in the event of a fault. This device is manufactured with a unique polymeric material that provides extremely fast response times and low trip factors allowing it to respond quickly to over-current events and reset itself when the fault is removed.

The TRF250-120T-2 utilizes the thermal effect of polymeric material to respond to over-current events. It is designed such that when an over-current is detected, the resistance of the polymeric material inside the fuse increases, resulting in a rise in temperature. This increase in temperature causes a thermally induced current limiting action that protects the system from over-current faults. The device then resets itself when the fault is removed and the temperature returns below the fusible point. This makes this device an ideal solution for system safety and protection as it is not necessary to polarize or replace the fuse after being used.

The range of operating current ratings available for the TRF250-120T-2 makes it suitable for a variety of applications, including automotive, industrial, consumer and medical applications. Some of the specific application areas for this device include automotive power supplies, automotive electrical systems,.motor drives, consumer electronics, security appliances, industrial control circuitry, consumer appliances, and medical equipment. It is suitable for being used in a wide range of applications, from low current, low voltage, AC/DC systems to high-current, high-voltage systems.

The TRF250-120T-2 is also designed to withstand temperature and vibration, making it ideal for automotive applications where the operating environment may vary widely. Additionally, its unique polymeric material has a wide temperature range, from -40°C to +125°C. This allows it to function reliably in extreme temperatures.

In summary, the TRF250-120T-2 is a reliable resettable fuse specifically designed for automotive, industrial and consumer applications. It uses special polymeric material to provide extremely fast response times and low trip factors, making it suitable for a wide range of applications, from low current, low voltage systems to high current, high voltage systems. Additionally, it is designed to withstand extreme temperatures and vibration, making it ideal for automotive applications.

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