TRF250-120ST-RG-B-0.5

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PTC Resettable Fuses

PTC resettable fuses, more commonly known as polyfuses, are relatively new devices intended to offer protection to electrical circuits by switching power off automatically if the current passing through them is too high. A PTC resettable fuse is based on a polymer and a metal alloy that undergoes a physical transformation when it is subjected to an electric current that exceeds the rated current of the device. TRF250-120ST-RG-B-0.5 is a PTC resettable fuse.

Application Field

The TRF250-120ST-RG-B-0.5 is suitable for use in battery powered/portable equipment such as personal computers, laptop adapters, and electric tools. It is also used in switch-mode power supplies, motor control circuits, and various other sensitive electronic systems and instruments. The relatively small size of the PTC resettable fuse makes it suitable for use in tight places where a traditional fuse would not fit such as in headphones or even mobile phones.

Working Principle

The fuse element of a TRF250-120ST-RG-B-0.5 is made of a metal alloy which is encased in a special polymeric material. The metal alloy inside is conductive and has a predetermined resistance. When the current flowing through the device is lower than the rated current, the thermally induced resistance of the metal alloy remains constant and the device does not react. However, when the current flowing through the device is higher than the rated current, the resistance of the metal alloy rapidly increases several hundred times, quickly reducing the current flow. This temperature-sensitive behavior is activated by the metal alloy being heated due to an electric current higher than its rated value.

When the current exceeds the rated current of the device, the temperature rises, causing the impedance of the device to increase quickly and the current to be redirected away from its original path. Thus, the device interrupts the flow of current, acting as a switch which deactivates itself when the current flow is cut off. The device then cools down and returns to its initial state, blocking the electric current yet again.

The TRF250-120ST-RG-B-0.5 is designed to reset itself automatically after the fault current has been halted. This is because the device has a multi-cycle design, in which the switching and resetting process can be repeated multiple times in case of current surges or spikes. This feature is unique to the TRF250-120ST-RG-B-0.5 and not possible with traditional fuses.

In conclusion, the TRF250-120ST-RG-B-0.5 is a PTC resettable fuse designed to provide reliable protection to sensitive electrical circuits from potentially harmful surges while being conveniently compact in size for tight spaces. Its multi-cycle design and resetting feature make it a reliable and cost efficient choice for many applications.

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