RUEF900

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PTC Resettable Fuses are current-limiting devices used for protection from low-power electrical circuits, and a common example of these is the RUEF900 type fuse. These fuses are designed for quick-opening for high-current overloads and short circuits, as these are the most common causes of circuit malfunctions. The RUEF900 is very popular and widely used because of its small size, ease of installation and cost effectiveness.

The RUEF900 fuse has many uses in different fields, such as automotive wiring, motor controllers, security systems and industrial automation. In automotive wiring, it prevents damage from short circuits due to its low internal resistance. It is also helpful in controlling the current on AC motors since it reduces the effects of voltage transients. In motor controllers, it serves as a protection device when there is a current overload due to heavy load conditions. Also, the RUEF900 provides protection from electrical surges in security systems and industrial automation. It helps to prevent unintended activation of security alarms or automated equipment.

The working principle of the RUEF900 is based on thermally-controlled bi-metallic elements. This fuse is made up of two metal pieces which are joined together at one end to form one unit. The two pieces of metal wire are arranged in two parallel circuits. When the current is below the rated value, the two pieces of metal are in contact, allowing the current to flow freely. When the current rises above the rated value, one of the two pieces expands due to the generation of heat, thus creating a break in the circuit.

On cooling, the metal piece contracts, re-establishing the contact and resetting the fuse. The RUEF900 has a fixed resistance with a relatively high breaking current. This means that the fuse can tolerate high overloads without being destroyed. It also has an extremely low internal resistance, so it has very little effect on the circuit in terms of voltage drop.

In conclusion, the RUEF900 fuse is an invaluable protection device for many applications, and its working principle of thermally controlled bi-metallic elements is highly efficient. It is easy to install, cost-effective, and its small size means it can fit in most electrical circuits. All these factors combined make the RUEF900 a popular choice for many applications.

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