MKDESIGN electrical components, German MKDESIGN models, MKDESIGN prices

MKDESIGN electrical components are fuses capable of multiple operations, 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 core. The fine pores in the ceramic core are filled with metallic sodium as the fusible element, and the void behind the piston is charged with argon gas to compress the metallic sodium. Under normal operating conditions, current can enter from 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 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. At the end of the interruption, the metallic 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.

MKDESIGN electrical component classification

(1) Point-contact diodes have a small PN junction contact area, cannot carry large forward currents or withstand high reverse voltages, but offer good high-frequency performance, making them suitable for use in high-frequency detection and switching circuits. (2) Surface-contact diodes have a large PN junction contact area, can carry large currents, and can withstand high reverse voltages, making them suitable for use in rectifier circuits. (3) Planar diodes have a small PN junction area when used as switching transistors in pulse digital circuits, and a larger PN junction area when used for high-power rectification. (4) Zener diodes are a special type of surface-contact silicon semiconductor diode that provides voltage stabilization. The main difference between zener diodes and ordinary diodes is that zener diodes operate in the reverse breakdown state of the PN junction. By implementing process controls during manufacturing and limiting the magnitude of the reverse current during use, it is ensured that the zener diode will not be damaged by overheating in the reverse breakdown state. Unlike general-purpose diodes, the reverse breakdown of a zener diode is reversible; as long as the current does not exceed the allowable value for the zener diode, the PN junction will not overheat and fail. When the external reverse voltage is removed, the zener diode restores its original performance, so it has good repetitive breakdown characteristics. (5) Photodiodes, also known as photosensitive diodes, have a glass window on their package to allow light exposure. Their characteristic is that when light strikes their PN junction, electron-hole pairs are generated, increasing the concentration of minority carriers in the semiconductor. Under a certain reverse bias voltage, this causes the reverse current to increase. Therefore, the reverse current increases linearly with increasing light intensity. In the absence of light, the volt-ampere characteristics of a photodiode are the same as those of an ordinary diode. As light-controlled components, photodiodes can be used for various object detection, photoelectric control, and automatic alarm applications. When manufactured as large-area photodiodes, they can serve as an energy source and are called solar cells. In this case, they do not require an external power supply and can directly convert light energy into electrical energy. (6) Light-emitting diodes are solid-state semiconductor display devices that directly convert electrical energy into light energy, abbreviated as LED. Similar to ordinary diodes, light-emitting diodes are also formed by a PN junction. The PN junction of a light-emitting diode is encapsulated in a transparent plastic case, with shapes including square, rectangular, and circular. Light-emitting diodes have advantages such as low drive voltage, small operating current, strong resistance to vibration and shock, small size, high reliability, low power consumption, and long service life, and are widely used in signal indication circuits. The principle of light-emitting diodes, commonly used in seven-segment displays in electronic technology, is opposite to that of photodiodes. When a light-emitting diode is forward-biased and current flows through it, it emits light as a result of energy release during the direct recombination of electrons and holes. Its spectral range is relatively narrow, and its wavelength depends on the base material used.

MKDESIGN electrical component structure

1. The cathode of an electron tube is the component used to emit electrons, divided into oxide cathodes and thoriated tungsten carbide cathodes. Generally, oxide cathodes are indirectly heated; they use a dedicated filament to heat the cathode body coated with barium oxide, etc., for thermionic emission. Thoriated tungsten carbide cathodes are generally directly heated; thermionic emission is produced simply by heating, so they serve as both the filament and the cathode. Theoretically, thoriated tungsten carbide cathodes have a much longer lifespan than oxide cathodes. Thoriated tungsten carbide cathodes are most widely used in high-power transmitter tubes, while oxide cathodes are generally used in transmitter tubes with an output power of 1kW or less. Mesh cathodes are made into a cylindrical shape using thinner thoriated tungsten wires. Their advantages are: (1) Because they are woven from many thoriated tungsten wires, they have a higher permeance. (2) It is easier to achieve a small cathode-grid spacing, which helps improve transconductance. (3) Because the filament has a mesh structure, the current in each individual filament wire is smaller, the local magnetic field is weaker, and thus the AC hum generated by the cathode current is also smaller. 2. The grids of an electron tube are divided into first grid and second grid based on their functions within the tube, sometimes also referred to as control grid and screen grid. The main function of the first grid is to control the cathode current, while the function of the second grid is to shield the first grid from the influence of the plate. The grid structure relates to its own mechanical strength and heat dissipation effect, and determines whether the tube can work stably. To reduce electron transit time, the grid-cathode spacing is made very short, even less than 1mm. Therefore, manufacturers often use materials with high mechanical strength, high thermal conductivity, good radiation coefficient, and high melting point to make the grids, to avoid thermal contact between electrodes at such small spacings. The first and second grids must be strictly aligned; this way, the screen grid captures fewer electrons, reducing screen grid dissipation, improving current distribution, and enhancing linearity. 12. The anode of an electron tube is the electrode that collects most of the electrons emitted by the cathode. During operation, due to electron bombardment of the plate surface and thermal radiation from other electrodes, a large amount of heat is generated at the plate. Since the power dissipation density of the plate is tens to hundreds of watts per square centimeter, natural radiation or conduction cooling is no longer sufficient for such high power densities. Therefore, forced cooling methods must be used. Common methods include air cooling, water cooling, and evaporative cooling.

MKDESIGN electrical component structure

The rated current of the fusible element is not equal to the rated current of the fuse. The rated current of the fusible element is selected based on the load current of the protected equipment. The rated current of the fuse should be greater than the rated current of the fusible element and determined in coordination with the main electrical appliance. The fuse mainly consists of 13 parts: the fusible element, the housing, and the support. Among these, the fusible element is the key component controlling the fusing characteristics. The material, dimensions, and shape of the fusible element determine the fusing characteristics. Fusible element materials are divided into two categories: low melting point and high melting point. Low melting point materials, such as lead and lead alloys, have a low melting point and fuse easily. Due to their higher resistivity, the cross-sectional dimensions of the fusible element made from them are larger, generating more metal vapor during fusing, so they are only suitable for fuses with low breaking capacity. High melting point materials, such as copper and silver, have a high melting point and do not fuse easily. However, due to their lower resistivity, they can be made with smaller cross-sectional dimensions than low melting point fusible elements, generating less metal vapor during fusing, making them suitable for fuses with high breaking capacity. The shape of the fusible element is divided into wire-type and strip-type. Changing the shape of the variable cross-section can significantly alter the fusing characteristics of the fuse. Fuses have various different fusing characteristic curves, which can meet the needs of different types of protected objects.

Weidou Intelligent Technology specializes in selling German MKDESIGN connectors, MKDESIGN switches, MKDESIGN relays, MKDESIGN controllers, MKDESIGN plugs, MKDESIGN sensors, MKDESIGN resistors, MKDESIGN capacitors, MKDESIGN buses, MKDESIGN modules, MKDESIGN cables, MKDESIGN power supplies, MKDESIGN interfaces, MKDESIGN gateways, and MKDESIGN circuit breakers. MKDESIGN products are original imports from Germany. Customers are welcome to inquire and place orders.