TRF250-120T-B-0.5

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PTC Resettable Fuses have several different applications and varied types that can be used in various ways. The TRF250-120T-B-0.5 is a type of resettable fuse, reading 250m ohm for its resistance, 120 for its voltage and 0.5 for its current rating. This combination of features allows the fuse to be applicable in a wide variety of situations.

The most common application for the TRF250-120T-B-0.5 is as a power and/or protection circuit for equipment in portable, low-power applications. Such examples would include USB devices, laptop computers, cellular phones, and other electronics that require relatively low voltages and currents. The characteristic of the PTC fuse being adjustable over a range of current and voltage ratings, allows it to be used to protect electronic circuits in these types of applications.

PTC Resettable Fuses have the ability to sense and react to excessive current, meaning they will open their circuit and prevent the flow of electricity during an overload or short circuit. This is known as their protective or circuit breaking function. Because of this ability, the TRF250-120T-B-0.5 is useful in providing over-current protection to a variety of circuits and applications.

The internal structures of the TRF250-120T-B-0.5 consist of an electrically insulating, usually polymeric, material with layers of metal-oxide particles bonded into it. When an overloaded current passes through the fuse, the metal particles become hot due to the high resistance which causes the metal-oxide particles to expand, creating an open circuit. Incidentally, the current then stops flowing due to the open circuit, thus preventing further damage. This is the process known as the resetting action of the fuse.

Due to the fact that the material used in the fuse does not reset or “cool down” in the event of an overload, a manual reset is necessary. This is done by following recommended procedures set by the manufacturer that may include pushing, twisting or lifting the trigger light. By restarting the fuse in this manner, the circuit is reestablished, and the current by-passed by the PTC is resumed.

The TRF250-120T-B-0.5 has a variety of applications, but knowing its precise working principle is important for the use and functionality of the fuse in different situations. The internal structure of the fuse is composed of an insulating material with metal-oxide particles and when the current becomes too much, as in an overload, the metal particles become hot and cause the metal-oxide particles to expand, creating an open circuit, thus breaking the flow of electricity.

The fuse will then need to be manually reset and restarted by following certain procedures set by the manufacturer. Knowing all this information is important for the accurate application of the PTC Resettable Fuse as all other uses will depend on how the fuse is set up and which voltage and current are being used. The TRF250-120T-B-0.5 is an essential wire protection component that needs to be taken into consideration in different applications.

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