RUEF300K-2 Circuit Protection

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PTC Resettable Fuses are used in a variety of applications. The RUEF300K-2 is a particular type of resettable fuse, designed and manufactured by Renesas Electronics. It is an ultra-low voltage, high-current resettable fuse designed for use in AC adapter circuits and other products requiring overcurrent and short-circuit protection.

RUEF300K-2 is a single-channel, ultra-low voltage resettable fuse that uses PTC (Positive Temperature Coefficient) thermistors as the temperature sensitive element. It is rated for up to a maximum of 300V DC and 1.2A current. RUEF300K-2 consists of a PTC element, which is housed in a two-pin package.

In normal operation, the fuse acts as a low resistance path for the flow of current up to its maximum rated current. When an overcurrent occurs, or an excessive short-circuit, the temperature of the PTC element increases rapidly, forcing it into its high impedance (“off”) state. This interrupts the current flow, and protects the device and circuit from further damage.

In order to reset the fuse after an overcurrent or short-circuit event, the PTC element needs to be allowed to cool down. When it reaches a safe temperature, the PTC element will reset and switch back on, restoring normal circuit operation. This feature allows the RUEF300K-2 fuse to protect devices and circuits from damage due to overcurrents and short-circuits, while still allowing them to return to normal operation after a suitable amount of time.

The RUEF300K-2 resettable fuse is suitable for use in power supplies, power adapters, UPS systems, charging circuits, and lithium ion battery packs. It offers protection from overcurrents and short-circuits, while at the same time providing protection against damage due to overheating. Additionally, the RUEF300K-2 does not require a manual reset after an overcurrent or short-circuit event, allowing for more reliable operation and safer designs.

Renesas has developed a number of devices and technologies for circuit protection, and the RUEF300K-2 is an example of their advanced engineering. The RUEF300K-2 is a reliable, low-cost resettable fuse that offers a simple and effective solution for AC adapter circuits and other power applications where overcurrent and short-circuit protection are required.

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