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PTC Resettable Fuses RXEF025-2 Application Field and Working Principle

PTC resettable fuses (also known as polyswitch, polyfuse, resettable device, multishot fuse, PPTC, AIC, solid-state fuses, polyfuse cellular fuses, thermal breakers, etc.) are self-resetting current-limiting devices that can be used in a variety of applications to protect people and equipment from electric shock, power surges, and short circuit damage. These devices also provide important circuit protection by limiting the amount of current that passes through a circuit in the event of a fault or overload condition. The PTC resettable fuse RXEF025-2 is a specific type of device in this product family.

Application Field

The RXEF025-2 has a wide range of applications in consumer and industrial devices. It is primarily used for protecting two-wire cables and circuit board traces from overloads, shorts, and other electrical problems. It can be used to protect motors, actuators, solenoids, and other electromechanical devices as well. This device is ideal for applications where UL or CSA approval is required, since it is UL/CSA approved.

The RXEF025-2 is also suitable for use in home appliance, office equipment, automotive, and medical device applications. Its compact size makes it suitable for space-constrained designs, and it is designed to operate in extreme temperatures. It is typically used in AC and DC circuits up to 16A and 250V.

Working Principle and Characteristics

The RXEF025-2 is a PTC resettable fuse that conforms to the IEC standard and utilizes Positive Temperature Coefficient (PTC) thermistor technology. The PTC thermistor is made from a semi-conductive ceramic material with a unique temperature sensitive resistive characteristics.

When a current surge occurs, such as a short circuit, the resistance in the thermistor decreases rapidly due to the Joule heating effect. This causes a decrease in the voltage over the device, allowing current to flow and the fuse to open. Once the current drops, the resistance will increase again, and the device will reset itself. This makes it an ideal device for applications that require intermittent over current protection.

The RXEF025-2 has a high rate of resettability and low tripping current, making it well suited for applications where a high degree of protection is required. It also has a fast response time, making it suitable for use in high-impedance circuits. The wide range of operating temperatures and contact ratings make it a suitable choice for various applications.

The RXEF025-2 has several advantages that make it a good choice for many applications. It is low-cost, self-resetting, UL/CSA approved, and has a wide range of contact ratings. It is also thermally stable and has a fast response time. Additionally, it is easy to use, and can be directly installed in an existing circuit with minimal effort.

Conclusion

The RXEF025-2 is a robust and reliable PTC resettable fuse that can be used in a variety of applications for circuit protection. It offers a high rate of resettability, a wide range of contact ratings, and can be used in extreme temperatures. It is UL/CSA approved, and its low cost and easy installation make it a popular choice for many applications.

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