RXEF300K

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PTC Resettable Fuses are a specialized type of fuse which provides protection against short-circuits or over current situations without the need for replacement after trips. The RXEF300K is a polymeric positive temperature coefficient (PPTC) fuse designed to provide over-current, short-circuit, and over-voltage protection. It is a compact, single-local fuse designed to provide complete and reliable protection for sophisticated electronic circuits. It features a unique design that combines arc extinguishing technology with a physical opening element for safety.

Application Field

The RXEF300K can be used in a wide range of applications, including consumer electronics, automotive, power supplies, and telecommunications. It is well suited for protecting electric motors, solenoid valves, and high-power components from over-current and short-circuit damage. Its fast response time and low trip level make it ideal for applications that require quick response times and maximum protection. It is suitable for use in applications such as Industrial systems, Home Automation, Robotics, LEDs, Automobiles, Solar Inverters and other industrial control systems.

Working Principle

The RXEF300K works by using Physical Opening (PO) and electrical arcing (EA) mechanisms to protect an electronic device or circuit from excessive or dangerous current flow. When an overload or short circuit occurs, the Polymeric Positive Temperature Coefficient (PPTC) material expands and triggers the PO and EA mechanisms which open the fuse. These mechanisms activate quickly to cut off the current before serious damage occurs. After the current has been blocked, the PPTC material cools off and contracts, allowing the fuse to reset and remain closed until the next overload. If the condition persists, then the PPTC material will heat up again and the fusing action will occur repeatedly.

The RXEF300K is designed for safety, with a fast response time and a low trip level. The fast response time helps to prevent fire and other hazards, while the low trip level prevents excessive current from damaging the protected device or circuit.

In short, the RXEF300K is a reliable and effective PTC Resettable Fuse that provides over-current, short-circuit, and over-voltage protection in a variety of challenging applications. With its robust design, fast response time, and low trip level, it is ideal for providing maximum protection for sensitive electronics.

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