TRF250-120T-R1-B-0.5

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PTC Resettable Fuses - TRF250-120T-R1-B-0.5 Application Field and Working Principle

PTC Resettable Fuses, also known as polyfuses, are a technological advancement in the field of overcurrent protection. They offer the best of both worlds; the ease of use and time savings as well as well as the safety of traditional fuses. They can save time by only requiring the user to open and reset if an overload occurs instead of waiting for fuses to be replaced or reset.

The TRF250-120T-R1-B-0.5 is a polymeric Positive Temperature Coefficient Resettable Fuse that has an operating current of 250 mA and a hold current of 120 mA. This type of fuse is designed to protect circuits from overloads, overcharges and short circuits. It is typically used to protect small, low power electronic devices such as computers, LED lights and other sensitive electronics.

The TRF250-120T-R1-B-0.5 can be mounted directly onto a circuit board and connected through PCB mounting pins. It will open when the circuit current exceeds the operating current, interrupting the circuit and protecting it from any damages caused by an overload. The fuse will then reset itself automatically when the current drops back to a safe level.

The working principle of the TRF250-120T-R1-B-0.5 is as follows: This device consists of a PTC or polymeric Positive Temperature Coefficient material integrated in a metal alloy housing. When the current in the circuit exceeds the rated operating current, the metal alloy housing heats up due to the Joulean heating effect, causing the PTC material to start expanding. This expansion compresses the disc shaped rotating member in the middle, and eventually causes it to block the contact between the two disconnected points. This interrupts the current flow, thus protecting the circuit. When the overcurrent is removed, the PTC material cools and resumes its original shape, thus resetting the fuse.

The TRF250-120T-R1-B-0.5 provides robust protection against overcurrent and has a higher current handling capacity than traditional fuses. It also requires minimal maintenance and can reset itself automatically in the event of an overload. This makes the device an ideal choice for small, low power electronic devices, as it can provide a reliable protection with minimal effort.

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