RUEF400K-0.138

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PTC resettable fuses, commonly known as polyfuses, are overcurrent protection devices used in electrical circuits. The RUEF400K-0.138 is no exception. It is a fusible resistor with bi-metallic elements laminated between two copper electrodes. It provides a resettable solution to overcurrent protection for automotive, consumer, and telecom applications.

The reactive elements in a RUEF400K-0.138 fuse are made from two dissimilar metals, usually a nickel-iron combination. Nickel-iron is used because it’s highly resistant to electrical corrosion and has a large temperature coefficient of resistance (TCR). When the current exceeds the rated value, the metals expand and cause a phase shift in the electrical current, which results in an increase in resistance.

The increase in resistance causes a large amount of heat to be generated, which pushes the temperature of the fusible resistor beyond its Curie temperature. This causes the nickel-iron elements to become magnetized and the resistance drops to a low value, usually zero ohms. This effectively shuts off the power supply, protecting the circuit elements from damage.

When the overload is removed, the heat dissipates and the metal elements relax, causing the resistance to rise again. Depending on the design, the resistance returns to its initial value or slightly higher than its initial value. This allows for a safe reset of the circuit, without the need for an external reset button or switch.

The RUEF400K-0.138 fuse, with its high temperature coefficient and resettable function, is ideal for multiple applications. Automotive applications include automotive electronics, heating and ventilation systems, and airbags. Consumer applications include computers, home appliances, batteries, and electrical appliances. Telecom applications include VoIP phones, routers, and servers.

In addition to its range of applications, the RUEF400K-0.138 fuse also features a wide range of current ratings, from 0.25A to 8A. Depending on the application, different ratings are available, allowing the user to select the right fuse for their particular application. The wide range of ratings also allows for maximum flexibility when designing new products.

The RUEF400K-0.138 fuse has proven to be a reliable and cost-effective solution for overcurrent protection in a variety of applications. Its resettable function ensures long-term reliability and protection of sensitive equipment, while its wide current ratings and multiple applications provide additional flexibility to designers. Thus, it is safe to say that the RUEF400K-0.138 is a great choice for any PTC resettable fuse requirement.

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