CDN15

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CDN fuses are designed to simultaneously offer overcurrent and short-circuit protection in electrical systems. Current-limiting fuses are a type of special purpose fuse used in electrical systems to protect against short-circuit currents. They are designed to offer protection against both high current and high voltage conditions, as well as combined current and voltage effects. Current-limiting fuses are classified by their voltage rating, breaking capacity, and current rating.

CDN fuses are designed for use in AC and DC applications, from 600V up to 690V. Typical applications include protection of motors, transformers, capacitors, solenoid valves, and other components. Typical currents range from 3A-1000A. It is important to match the fuse to its application, as the fuse must limit the current to a value that is below the maximum rating of the component it is protecting.

The physical construction and working principle of CDN fuses can vary depending on the application. In the most common type of CDN fuse, known as the ferrule type, consists of metal ferrules or electrodes housed in an insulating sleeve into which the fuse element is inserted. This forms a cylindrical package which allows easy installation in the load circuit. This type of fuse is generally used in AC applications and acts as a single-pole device. When an overcurrent passes through the fuse element, the ferrules surrounding it will heat up, causing the fuses to be disconnected from the load and opening the circuit. This is known as thermally disconnecting, and it is a key feature of CDN fuses, as they protect the load without the need for any sort of reset mechanism.

In addition to ferrule type CDN fuses, another type called “Quick-Break Fuses” are available. These are designed for protection against high frequency and short circuit transients, and are used for DC applications. In this type of fuse, a split copper strap is used to quickly open the circuit. This type of fuse is often used in power conversion and motor drive applications.

CDN fuses play an important role in protecting electrical components, and they are available in a variety of sizes and ratings to suit different applications. It is important to select the correct fuse type and size for your application to ensure optimal operation and safety. Selecting the correct fuse for your application is critical, and it is important to note that some fuses may require additional protection items, such as surge arresters or current limiting devices, to provide additional protection from high overcurrents or voltage spikes.

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