RXEF040S

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PTC resettable fuses are becoming increasingly popular in the electronic industries as they provide overcurrent protection of both AC and DC circuits. An example of a PTC resettable fuse is the RXEF040S which is often used in a range of different applications. This article will discuss the various applications of the RXEF040S and the underlying working principle of these fuses.

Applications of RXEF040S

The RXEF040S is mainly used for overcurrent protection in a wide range of applications. It is often used in products such as routers, low-voltage DC power supply, battery-powered equipment, power adapters, and low-power computer systems. The RXEF040S provides reliable overcurrent protection in such applications due to its low power consumption and minimal impedance.

Furthermore, this PTC resettable fuse is often used for inrush current protection during start up of different appliances. During start-up of heavy-duty motors, for example, inrush current can cause surge voltages and potentially damage equipment. The RXEF040S helps to limit the inrush current and is often used in motor start circuits to prevent such damage. It is also often used in combination with other overcurrent protection devices for additional redundancy.

The RXEF040S is also used as an overvoltage protector. This fuse is designed to trip when voltage rises higher than safe working levels and protect the connected equipment from damage. This effective overvoltage protection is often used in products such as vacuum cleaners, electric drills, and hand-held power tools.

Working Principle of RXEF040S

The working principle of a PTC resettable fuse is based on the positive temperature coefficient (PTC) temperature characteristic of certain plastics and ceramics. When a certain current is exceeded, the PTC material heats up due to the Joule effect which increases its resistance. This thermostatic effect helps to limit the current and thus protect the electronic device from overload.

The RXEF040S operates on a similar principle to other PTC resettable fuse products. The fuse is composed of a PTC thermistor and a nickel-plated contact element, which are encased in a flame-resistant plastic housing. The thermistor is designed to sense current levels in order to trip at a certain predetermined level.

When excessive current passes through the RXEF040S, it heats up the PTC thermistor and this in turn causes the gas filled capsule surrounding the contact element to expand. This expansion leads to breakage of the contact element and thus the RXEF040S gets opened. This effectively cuts the circuit and limits the current, thus providing reliable overcurrent protection. After the current reduces to normal levels, the expanded gas capsule slowly contracts, allowing the contact element to rejoin. The RXEF040S can then be reset manually by pressing the reset button.

Conclusion

The RXEF040S is an efficient and reliable PTC resettable fuse which finds applications in a variety of products. It is often used for applications involving overcurrent or overvoltage protection. The working principle of the RXEF040S is based on the PTC temperature characteristic of certain plastics and ceramics, which reduces its resistance when temperature rises. This effectively cuts off the current and helps protect the connected equipment.

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