TRF250-120U

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PTC Resettable Fuses are an integral and important element in many electrical systems. They provide a cost-effective way to protect delicate equipment from excessive current, temperature and other forms of electrical disturbances. TRF250-120U is a great example of such smart resettable protection.

TRF250-120U is a pluggable PTC (positive temperature coefficient) resettable fuse designed for protection of system and circuit from short circuits, overloads, and overheating. The device comes with solder pins to facilitate modern soldering methods such as reflow and wave soldering.

The application field of TRF250-120U includes home and office appliances, chargers, computers, set-top-boxes, smart home equipments, etc. It is well-suited for low voltage (<50V AC, <35V DC) applications with continuous current range of 0.3A~15A. >

The working principle of TRF250-120U is quite simple, yet very effective. The device comprises of a polymeric PTC element mounted in a thermally conductive printed circuit board. When an overload occurs, heat generated from the PTC element causes a gradual increase in resistance which reduces the current flow in the circuit, finally bringing the current to below the overload value. This varies the temperature and shrinks the PTC element, thereby drastically reducing the resistance and restoring the normal current through the circuit.

The unique feature of TRF250-120U is the ability to reset itself within seconds after a short circuit or overload condition is removed. This rapid response allows system designers to increase the reliability of their designs by providing effective protection with minimal downtime, hence avoiding expensive repairs and service delays.

TRF250-120U is easy to install and requires minimal maintenance, with no calibration or testing needed. Its combination of robust design, reliable performance, fast reset speed, and competitive cost make it an ideal solution for various applications in need of reliable over-current protection.

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