RUEF250U-2

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PTC Resettable Fuses are an essential component in electrical protection applications, designed to protect circuits from overcurrents, overvoltages, and over-temperatures. The RUEF250U-2 is a 250VAC and 30VDC resettable thermal fuse with a marked current rating of 2A at 25°C and full cycle current trip rate of 1.8A. The RUEF250U-2 is designed for AC or DC primary protection when used with appropriate overcurrent protection, and is AEC lightweight qualified.

The application field of the RUEF250U-2 includes but is not limited to wireless data products such as Bluetooth, cellular phones, Wi-Fi access points, and other consumer equipment such as wireless audio and video streaming devices. It is also suitable for a number of industrial systems such as AC/DC power adapters, robotic systems, medical devices, and more. This resettable thermal fuse works effectively and reliably in any circuit where overcurrent protection is required.

The working principle of the RUEF250U-2 is based on a patented temperature sensitive material, PTC. When the current flowing through the device exceeds its rated maximum value, IPM-level heat is generated, and this increases the resistance of the PTC material. A higher resistance causes a current reduction and thereby reduces the power dissipated, controlling the maximum current to the set level. Furthermore, an overtemperature protection mechanism is provided by the PTC, which trips the device into self-protection mode if the temperature of the PTC exceeds its rated maximum temperature.

The RUEF250U-2 is available in epoxy-encapsulated 1.2 mm x 0.9mm (L x W) SMD footprints and can be used with surface mount temperature assemblies such as main board metallization, as well as many other mounting materials such as dielectrics, copper, and aluminum. Its fast response, low operating temperature, and temperature cycling capability allow for robust protection in applications where space is limited.

The RUEF250U-2 is designed to safely dissipate heat from the fuse, thereby ensuring that the temperature remains in a safe operating range. The small size of the fuse makes it ideal for applications where space is at a premium, such as consumer electronic devices. Furthermore, the fuse has a quick response time and can be reset by simply disconnecting and reconnecting the power.

In conclusion, the RUEF250U-2 is an effective and reliable resettable thermal fuse for AC or DC primary protection in a variety of applications. With its fast trip response, low operating temperature, and easy reset functionality, the RUEF250U-2 is an ideal solution for controlling currents up to 2A in thermal protection applications.

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