RXEF017-1

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PTC（Positive Temperature Coefficient） Resettable Fuses（also known as polyfuse） are electronic protection devices that provide current overload protection for an electrical circuit. They are usually used to protect against over-voltage, over-current and short circuit conditions. The RXEF017-1 is designed for use in a wide variety of applications, including in automotive and industrial electronic equipment and control systems. It is a popular choice for designers seeking reliable, cost-effective, and long-lasting circuit protection.

The RXEF017-1 is a three-terminal, overcurrent protection device. It consists of three differential-connected, two-layer, metal oxide electrodes that monitor the current flow through them. When current exceeds the specified trip level, the metal-oxide electrodes generate a voltage, causing the two-layer metal film to heat up and expand. This expansion forces the electrode to break at the point where it crosses the other metal-oxide layer, and this short-circuits the entire device. The short-circuits immediately trips the device and disables the circuit.

To reset the RXEF017-1, the current must be turned off and the short-circuit caused by the expanding electrode must be reset. Once this is done, the device can be reinitialized by allowing the two metal-oxide layers to cool down and then reconnected. The device can then be re-energized and continue protecting the circuit from over-voltage and over-current.

The short-circuit protection provided by the RXEF017-1 is mainly beneficial in automotive and industrial electronic equipment and control systems. These systems often require protection from large inrush currents that can arise during startup or due to the sudden switching of loads. The RXEF017-1 can handle these short-term, transient currents and thereby protect the system from catastrophic failure. Moreover, since the device does not contain over-fused elements, it can be used in smaller, lower-cost packages compared to other types of fuse technology.

In addition to short-circuit protection, the RXEF017-1 can also provide some secondary, overload protection. This is because the device senses current and triggers a trip if the current is above the set limit. Therefore, if an overcurrent condition exists in the circuit, the device will trip before the overcurrent can cause damage.

In conclusion, the RXEF017-1 is a reliable, cost-effective, and long-lasting circuit protection device suitable for a wide range of applications. It provides reliable low-level access to current overload protection, and its effective thermal management and primary short-circuit protection make it an attractive choice for designers seeking reliable circuit protection.

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