PREKAB electrical components Germany PREKAB model PREKAB price

PREKAB electrical components are devices that convert optical signals into electrical signals. Their operating principle is based on the photoelectric effect. The photoelectric effect refers to the phenomenon where electrons in a material absorb photon energy when light strikes certain substances, resulting in corresponding electrical effects. Based on the different manifestations of the photoelectric effect, it is classified into three categories: external photoelectric effect, internal photoelectric effect, and photovoltaic effect. Photoelectric devices include phototubes, photomultiplier tubes, photoresistors, photodiodes, phototransistors, and solar cells. The performance and characteristic curves of photoelectric devices are analyzed.

PREKAB electrical components applications

Dedicated solid-state relays can feature short-circuit protection, overload protection, and overheat protection. When encapsulated with fixed combination logic, they form intelligent modules tailored to user requirements for direct use in control systems. Solid-state relays are widely used in computer peripheral interface equipment, constant temperature systems, temperature regulation, electric furnace heating control, motor control, CNC machinery, remote control systems, and industrial automation devices; signal lights, dimming, flashers, and stage lighting control systems; instruments and meters, medical devices, copiers, and automatic washing machines; automatic fire fighting and security systems, as well as switching switches for power capacitors used in grid power factor compensation. They are also extensively used in explosive-proof, moisture-proof, and corrosion-resistant environments such as the chemical industry and coal mines.

PREKAB electrical components characteristics

Typically, the actual static characteristic output of a sensor is a curve rather than a straight line. In practical applications, to enable instruments to have uniformly scaled readings, a fitted straight line is commonly used to approximate the actual characteristic curve. Linearity (non-linear error) is a performance indicator of this degree of approximation. There are various methods for selecting the fitted straight line. For example, the theoretical straight line connecting the zero-input and full-scale output points can be used as the fitted line; or the theoretical straight line that minimizes the sum of squared deviations from each point on the characteristic curve can be used, known as the least squares fitted line.

PREKAB electrical components composition

1. A typical fuse consists of three parts: First is the fusible element, which is the core of the fuse and serves to cut off the current when it melts. For fuses of the same type and rating, the fusible elements must have the same material, identical geometric dimensions, minimally low and consistent resistance values, and most importantly, consistent fusing characteristics. Household fuses are commonly made of lead-antimony alloy. Second is the electrode part, usually consisting of two electrodes, which are critical components connecting the fusible element to the circuit. They must have good electrical conductivity and should not produce significant contact resistance upon installation. Third is the support structure. Since the fusible element of a fuse is generally thin and flexible, the support structure serves to fix the fusible element and make the three parts a rigid whole for easy installation and use. It must have good mechanical strength, insulation, heat resistance, and flame retardancy, and should not exhibit breaking, deformation, combustion, or short-circuiting during use. 2. Arc extinguishing device: Fuses used in power circuits and high-power equipment not only have the three parts of a general fuse but also include an arc extinguishing device. This is because the circuits protected by such fuses not only have higher operating currents, but also exhibit very high voltage across the terminals when the fusible element melts. Often, the fusible element may have melted (fused) or even vaporized, but the current is not interrupted. The reason is that arcing occurs between the two electrodes of the fuse under the influence of voltage and current at the moment of fusing. This arc extinguishing device must have strong insulation, good thermal conductivity, and negative electronegativity. Quartz sand is a commonly used arc-extinguishing material. 11. Fusing indication device: Some fuses are equipped with a fusing indication device. Its function is to undergo a certain visual change after the fuse operates (melts), making it easy for maintenance personnel to detect, such as emitting light, changing color, or popping out a solid indicator.

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