RUEF250S

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PTC resettable fuses are slowly gaining popularity as an alternative to traditional fuses, and this is due to their ability to monitor current flow and quickly react when a current surge reaches the protection level. The various types of PTC resettable fuses have different current ratings, and the RUEF250S is no exception. It is a relatively new fuse type intended for applications in which current flux in the range of 6.3 A to 10 A is expected. The RUEF250S is a surface mount type PTC resettable fuse and, as such, it has the advantage of not requiring external hardware for mounting.

The RUEF250S is based on a poly-fuse design, where a polymer material is used as a resistive element. When current passes through this element, it will heat up and eventually melt, thus interrupting current flow. This causes the fuse to trip and stop the current surge. However, due to the special characteristics of the polymer, the fuse then cools down and the polymer resets, and thus allowing the current to resume flowing. Therefore, the RUEF250S can be reset multiple times without needing a replacement.

The internal resistance of the RUEF250S is specified at 0.25 ohms (±20%), and it saturates when the specified current level of 10 A is achieved. This saturation mechanism keeps the fuse temperature under control and prevents accidental destruction due to excessive current. Further, the holding current of the RUEF250S is specified at 8 A, which means that it is capable of sustained current flow of up to 8 A. This feature makes the RUEF250S ideal for protecting circuits that are subjected to long duration currents, such as motors, fans, or LED drivers.

Given its ability to withstand prolonged current flow and its resetability, the RUEF250S is ideal for use in low voltage power supplies. In addition to this, due to its small size and surface mount type design, it can also be used in small-scale applications with limited space available for mounting, and for protecting sensitive electronic components from current surges.

In summary, the RUEF250S is a PTC resettable fuse type intended for a range of applications in which a current rating between 6.3 A and 10 A is expected. It is based on a poly-fuse design, and thus it is capable of resetting itself multiple times after a current surge is interrupted. Thanks to its high current handling capability, its small size and surface mount design, and its resetability, the RUEF250S is ideal for applications in low voltage power supplies and in small-scale circuit protection.

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