eltako electrical components Germany eltako model eltako price

eltako electrical components refer to an electrical device that disconnects the circuit by melting the fuse element with the heat generated by itself when the current exceeds the specified value. A fuse is a current protection device made based on the principle that when the current exceeds the specified value for a period of time, the heat generated by itself melts the fuse element, thereby disconnecting the circuit. Fuses are widely used in high and low voltage distribution systems, control systems, and electrical equipment as short-circuit and overcurrent protectors, and are one of the most commonly used protective devices. It is an electrical device that uses a metal conductor as a fuse element connected in series in the circuit. When overload or short-circuit current passes through the fuse element, it melts due to its own heating, thereby breaking the circuit. The fuse has a simple structure and is easy to use. It is widely used in power systems, various electrical equipment, and household appliances as a protective device.

eltako electrical component principle

A NPN type bipolar transistor can be regarded as two diodes joined together with a common anode. In the normal operating state of a bipolar transistor, the base-emitter junction is forward-biased, while the base-collector junction is reverse-biased. When no external voltage is applied, the electron concentration in the N region of the emitter junction is greater than that in the P region, and some electrons will diffuse into the P region. Similarly, some holes in the P region will also diffuse into the N region. In this way, a space charge region is formed on the emitter junction, generating an internal electric field directed from the N region to the P region. This electric field hinders the further occurrence of the above diffusion process, thereby achieving dynamic equilibrium. At this time, if a forward voltage is applied to the emitter junction, the dynamic balance between the above carrier diffusion motion and the internal electric field in the depletion layer will be broken, causing thermally excited electrons to be injected into the base region. In NPN type transistors, the base region is P type doped, where holes are the majority dopants, so electrons in this region are called "minority carriers". Electrons injected from the emitter into the base region partly recombine with the majority carriers (holes) here. On the other hand, due to the low doping level and thin physical dimensions of the base region, and because the collector junction is reverse-biased, most electrons will reach the collector region through drift motion, forming the collector current. To minimize the recombination of electrons before they reach the collector junction, the base region of the transistor must be made thin enough so that the time required for carrier diffusion is shorter than the lifetime of semiconductor minority carriers. At the same time, the thickness of the base must be much smaller than the diffusion length of electrons. In modern bipolar transistors, the typical value of the base region thickness is a few tenths of a micrometer. It should be noted that although both the collector and emitter are N type doped, their doping levels and physical properties are not the same. Therefore, a bipolar transistor must be distinguished from the form of two diodes connected in series in opposite directions.

eltako electrical component classification

There are various classification methods for thyristors: (1) Classification by turn-off, conduction, and control methods: Thyristors can be divided into conventional thyristors, bidirectional thyristors, reverse-conducting thyristors, gate turn-off thyristors, BTG thyristors, temperature-controlled thyristors, and light-controlled thyristors according to their turn-off, conduction, and control methods. (2) Classification by pins and polarity: Thyristors can be divided into two-pin thyristors, three-pin thyristors, and four-pin thyristors according to their pins and polarity. (3) Classification by package form: Thyristors can be divided into three types: metal-packaged thyristors, plastic-packaged thyristors, and ceramic-packaged thyristors according to their package form. Among them, metal-packaged thyristors are further divided into bolt-type, flat-type, round-shell type, etc.; plastic-packaged thyristors are divided into two types: with heat sink and without heat sink. (4) Classification by current capacity: Thyristors can be divided into high-power thyristors, medium-power thyristors, and low-power thyristors according to their current capacity. Usually, high-power thyristors mostly adopt metal shell packaging, while medium and low-power thyristors mostly adopt plastic or ceramic packaging. (5) Classification by turn-off speed: Thyristors can be divided into conventional thyristors and high-frequency (fast) thyristors according to their turn-off speed. (6) Zero-crossing trigger - generally for power regulation, i.e., triggering when the phase of the sinusoidal AC voltage crosses zero. Triggering must occur at the zero-crossing point to conduct the thyristor. (7) Non-zero-crossing trigger - The thyristor can be triggered to conduct regardless of the phase of the AC voltage. Commonly, it is phase-shift triggering, i.e., changing the output percentage by changing the conduction angle (phase angle) of the sinusoidal AC.

eltako electrical component advantages

Components are not consumed. No matter how excellent the vacuum tube is, it will gradually deteriorate due to changes in cathode atoms and chronic air leakage. Due to technical reasons, transistors had the same problem at the beginning of their manufacture. They consume very little electrical energy, only one-tenth or even one-hundredth of that of vacuum tubes. Unlike vacuum tubes, they do not need to heat a filament to generate free electrons. A transistor radio can run for half a year or a year on just a few dry cells, which is difficult to achieve for vacuum tube radios. No preheating is required; it works as soon as it is turned on. For example, a transistor radio sounds as soon as it is turned on, and a transistor TV displays images quickly after being turned on. Vacuum tube equipment cannot achieve this. After turning on, you have to wait a while before you can hear sound or see images. Obviously, transistors have significant advantages in military, measurement, recording, and other aspects. They are sturdy and reliable, resistant to impact and vibration, which vacuum tubes cannot match. In addition, the volume of a transistor is only one-tenth to one-hundredth of that of a vacuum tube, and it generates very little heat, making it suitable for designing small, complex, and reliable circuits. Although the manufacturing process of transistors is precise, the procedures are simple, which is conducive to increasing the installation density of components.

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