PTC Resettable Fuses: RUE700 Application Field and Working Principle

PTC (Positive Temperature Coefficient) Resettable Fuses, also known as polyfuses, are a type of electronic protection device used in a variety of fields and products. RUE700, a series of PTC resettable fuses supplied by China\'s Eaton Powerware, has many applications in industrial, commercial, and consumer applications. This article will provide an overview of the application of RUE700, the principles on which it works, its advantages, and other considerations for its use.

RUE700 is a range of polyfuses featuring high-performance product design and comprehensive protection. This series includes single- and multi-pole automotive polyfuses for automotive applications, SPD overvoltage and overcurrent protection, transformer and audio output protection, overvoltage protection, overcurrent protection, EMC countermeasure, timer relay protection, and thermal fuses. It also offers a variety of product capacities to meet different application needs, including 40A, 25A, 20A, 15A, 10A, and 5A. The RUE700 series provides single- and three-phase solutions, allowing for efficient power supply and protection of motor, converter, and compressor.

The principle upon which PTC resettable fuses work is that the conducting path is full of positively charged particles, each having a positive temperature coefficient of resistance. When the current surging through them exceeds the configured current rating, the temperature of the particles increases, causing them to expand and form a closed state. This prevents further current from passing through the conducting path. Once the underlying cause of the overload is removed, the particles will cool and return to their original state, allowing for a resumption of the electric current.

The RUE700 series has several advantages that make it a popular choice in the market. Its polymeric materials and special construction make it less sensitive to temperature, humidity, and electrical overstress, ensuring a reliable product. The superior self-resetting ability also allows it to quickly resume its normal working state without manual intervention. Compared to traditional fuse devices, the PTC resettable fuses are comparatively simpler, with no more than two wires to connect both sides of the product.

The selection of PTC resettable fuses should be based on certain criteria. The wattage, base type, mount size, and price should be considered based on the application it is being used for, along with its thermal stability, capacity, operating current, and voltage rating. In addition, additional features such as overvoltage protection, humidity protection, etc. should also be taken into account when selecting an appropriate PTC resettable fuse for a particular application.

In conclusion, RUE700 series PTC resettable fuses are effective current protection devices used in a variety of applications. They offer a range of product capacities with high thermal stability and self-resetting ability. The selection of a PTC resettable fuse should take into account wattage, mount size, capacity, and voltage rating, along with additional features like overvoltage and humidity protection.