eska electrical components Germany eska model eska price

eska electrical components are fuses that can be operated multiple times, known in Japan as permanent fuses. Immediately after interrupting an overload or short-circuit current, the fusible element automatically restores to its original state. The housing is made of austenitic stainless steel, with a beryllium oxide ceramic core embedded in the center. The space between the stainless steel and the ceramic core is filled with glass to seal and secure the ceramic core. The fine pores of the ceramic core are filled with metallic sodium as the fusible element, and the void behind the piston is filled with argon gas to compress the metallic sodium. Under normal operating conditions, current can enter from the lead terminal A, pass through the metallic sodium in the fine pores of the ceramic core, conduct to the stainless steel housing, and exit via the output terminal B. When a short-circuit current passes through the fuse, it rapidly heats the metallic sodium in the fine pores of the ceramic core, causing it to change from a solid to a high-temperature, high-pressure plasma vapor. The resistivity increases rapidly, thereby strongly limiting the short-circuit current and interrupting it instantly. When the interruption ends, the sodium vapor immediately returns to liquid and solid states, while the argon gas pushes the piston again to compress the metallic sodium, re-establishing the circuit connection.

Advantages of eska electrical components

Components do not consume material. No matter how excellent a vacuum tube is, it will gradually deteriorate due to changes in cathode atoms and chronic air leakage. For technical reasons, transistors faced similar issues at the beginning of their production. They consume very little electrical energy, only one-tenth to one-several-tenths of that of vacuum tubes. Unlike vacuum tubes, they do not require heating a filament to produce free electrons. A transistor radio can operate for six months to a year on just a few dry cells, which is difficult to achieve with vacuum tube radios. No preheating is required; they work immediately upon startup. For example, a transistor radio produces sound as soon as it is turned on, and a transistor TV displays an image quickly. Vacuum tube equipment cannot achieve this. After turning on, one must wait a while before hearing sound or seeing an image. Clearly, transistors have significant advantages in military, measurement, and recording applications. They are robust and reliable, resistant to shock and vibration, which vacuum tubes cannot match. Additionally, 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 for transistors is precise, the steps are simple, facilitating higher component installation density.

eska electrical component classification

Inductor coils commonly used in circuits are roughly classified as follows: By inductance form: fixed inductors, variable inductors. By magnetic core property: air-core coils, ferrite coils, iron-core coils, copper-core coils. By operating nature: antenna coils, oscillator coils, choke coils, trap coils, deflection coils. By winding structure: single-layer coils, multi-layer coils, honeycomb coils, close-wound coils, spaced-wound coils, self-supporting coils, honeycomb coils, random-wound coils.

eska electrical component parameters

1. Stable voltage refers to the stable voltage value generated across the Zener diode when it passes the rated current. This value varies slightly with operating current and temperature. Due to differences in manufacturing processes, the stabilization voltage of Zener diodes of the same model is not completely consistent. 2. Reverse leakage current refers to the current passing through the Zener diode when it generates a stable voltage. Below this value, the Zener diode can still stabilize voltage, but the effect will be poorer; above this value, as long as the rated power dissipation is not exceeded, it is permissible, and the stabilization performance will be better, though it will consume more electrical energy. 3. Dynamic resistance refers to the ratio of the voltage change to the current change across the Zener diode. This ratio changes with the operating current; generally, the larger the operating current, the smaller the dynamic resistance. 4. Rated power dissipation is determined by the allowable temperature rise of the chip, and its value is the product of the stable voltage and the maximum allowable current. 5. Temperature coefficient: If the temperature of the Zener diode changes, its stable voltage will also undergo slight changes. The relative change in voltage across the tube caused by a temperature change of 1℃ is the temperature coefficient (unit: %/℃). Generally speaking, stabilization voltages below 6V belong to Zener breakdown, where the temperature coefficient is negative; the temperature coefficient is positive. When the temperature rises, the depletion layer decreases. In the depletion layer, the valence electrons of atoms rise to higher energy levels, and a smaller electric field strength can excite valence electrons from the atoms to produce Zener breakdown, so its temperature coefficient is negative. Avalanche breakdown occurs when the depletion layer is wider and the electric field strength is lower. An increase in temperature increases the vibration amplitude of lattice atoms, hindering the movement of carriers. In this case, avalanche breakdown can only occur if the reverse voltage is increased, so the voltage temperature coefficient of avalanche breakdown is positive. For applications with high requirements for power supplies, two Zener diodes with opposite temperature coefficients can be connected in series for compensation. Due to mutual compensation, the temperature coefficient is greatly reduced. 11. Reverse leakage current refers to the leakage current generated by the Zener diode under the specified reverse voltage.

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