0819R-04F

Fixed Inductors

0819R-04F application field and working principle

Fixed inductors, such as the 0819R-04F model, are very common components used as basic current limiting devices in electric circuits. Although not the only purpose they are capable of, fixed inductors are mainly used to store and release energy over a specific period of time.

These devices basically consist of two or more loops of wire wound around an iron-based core material such as a ferrite, which functions as a magnetic field booster. When a voltage is applied across one end of the loop and another across the other, an electric current is generated, which can transport either voltage or charge. When this current starts flowing, it sets up an opposing magnetic flux within the core material, which in turn creates an opposing electric field.

Therefore, the working principle of fixed inductors goes like this: the electric current flowing through one end of the loop creates a magnetic flux within the core material. This flux line, in turn, induces an opposing electric field to the current, which is then the opposing polarity of the voltage applied to create the current. As a result, the current lessens or even ceases completely. This is known as the electromagnetic field. In simpler terms, this process can be seen as a kind of "magnetic brake" controlling the movement of electrons.

The main application field of fixed inductors is the power-supply and electrical equipment industry requiring current limiting applications. There, fixed inductors are implemented in a wide range of circuit designs and components, such as DC to AC powerTransformers, power supply components, automotive and other applications needing current limiting for protection purposes. In some applications, such as in radio transmitters and receivers, fixed inductors are also used to modulate the voltage signals.

More specifically, fixed inductors such as the 0819R-04F offer a range of current-limiting capabilities, as explained: the rated isolation voltage is 5V AC RMS, the rated current is 0.05 A, the peak impulse current is 0.2 A. This fixed inductor can be easily mounted on the board and provides a reliable current limitation, thus achieving the required protection level.

In conclusion, fixed inductors, such as the 0819R-04F, are used mainly in power supplies and electrical equipment and provide current limiting capabilities. The magnetic flux created within the core material of the inductor induces an opposing electric field which limits the amount of current flowing through the component and prevents it from damaging other components.