RKEF075-2

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PTC Resettable Fuses

PTC resettable fuses, also known as Polymeric Positive Temperature Coefficient Resettable Fuses, are components used in electronic circuits to protect against over-current conditions. They work by using semiconductor material that has a positive temperature coefficient. When the current passing through the fuse reaches a certain threshold, the semiconductor material rapidly increases in temperature, creating an open circuit, thus interrupting the current flow. When the current is reduced to a safe level, the semiconductor material will then cool down, returning to its original state and re-establishing the circuit connection.

RKEF075-2 Application Field and Working Principle

The RKEF075-2 is a versatile PTC resettable fuse suitable for use with both AC and DC circuits. It is rated for a maximum voltage of 250VAC/Vdc, and a rated current of 0.5A (which is an important detail, as it gives an indication of the level of current it is designed to handle). It also features a maximum operating temperature of 125°C.

The working principle of the RKEF075-2 is simple. When the current flowing through the fuse reaches its rated value of 0.5A (in case of this model), the temperature of the semiconductor material in the fuse rapidly increases, creating an open circuit, which interrupts the current flow. When the current passing through the fuse drops below the rated level, the semiconductor material cools down and returns to its original state, restoring the circuit connection.

The RKEF075-2 is a reliable and economical choice for use in AC/DC circuits where over-current protection is required. It is particularly suitable for use in industrial and commercial environments, such as office automation systems and consumer electronics, where its low profile and robust design make it an ideal choice.

Applications

The RKEF075-2 can be used in a wide range of applications, including:

• Consumer electronic products, such as TVs, DVD players, stereo systems and cell phones
• Office automation systems, such as computers and printers
• Industrial electronics, including AC and DC power supplies
• Automotive electronics, such as ECUs, speed controllers and sensors
• Communication systems, including radio and satellite transceivers

Advantages

The RKEF075-2 offers a number of advantages over traditional resettable fuses:

• Small, space-saving design
• Robust construction and reliable performance
• High thermal stability and long-term stability
• High tolerance to transient over-currents
• Cost-effectiveness and easy installation

Conclusion

The RKEF075-2 PTC resettable fuse is a reliable and efficient choice for over-current protection in AC/DC circuits. Its small size, robust design and high thermal stability make it suitable for a wide range of applications, including consumer electronics, office automation systems, industrial electronics and automotive electronics. Furthermore, its cost-effectiveness and easy installation make it an attractive option for low-cost electronics.

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