Feinmetall electrical components Germany Feinmetall model Feinmetall price

Feinmetall electrical component is a resistive device with nonlinear voltage-current characteristics, mainly used for voltage clamping when the circuit is subjected to overvoltage, absorbing excess current to protect sensitive devices. The resistive body material of the varistor is semiconductor, so it is a type of semiconductor resistor. The currently widely used "zinc oxide" varistor has a main body composed of divalent element zinc and hexavalent element oxygen. Therefore, from a material perspective, the zinc oxide varistor is a "II-VI group oxide semiconductor". In Taiwan, China, varistors are called "surge absorbers", sometimes also referred to as "electric shock (surge) suppressors (absorbers)". A varistor is a voltage-limiting protection device. Utilizing the nonlinear characteristics of the varistor, when overvoltage appears between the two poles of the varistor, the varistor can clamp the voltage to a relatively fixed value, thereby achieving protection for the downstream circuit. The main parameters of a varistor include: varistor voltage, current handling capacity, junction capacitance, response time, etc. The response time of a varistor is in the ns range, faster than gas discharge tubes, and slightly slower than TVS tubes. Generally, its response speed can meet the requirements for overvoltage protection in electronic circuits. The junction capacitance of a varistor is generally in the order of hundreds to thousands of Pf, making it unsuitable for direct application in the protection of high-frequency signal lines in many cases. When applied in AC circuit protection, its larger junction capacitance will increase leakage current, which needs to be fully considered in the design of protection circuits. The current handling capacity of a varistor is relatively large, but smaller than that of gas discharge tubes. Varistors, abbreviated as VDR, are voltage-sensitive nonlinear overvoltage protection semiconductor components.

Feinmetall electrical component structure

The rated current of the fuse element is not equal to the rated current of the fuse. The rated current of the fuse 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 fuse element and determined in coordination with the main electrical appliance. The fuse mainly consists of 3 parts: the fuse element, the housing, and the support. Among them, the fuse element is the key component controlling the fusing characteristics. The material, size, and shape of the fuse element determine the fusing characteristics. Fuse 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 low melting points and melt easily. Due to their higher resistivity, the cross-sectional size of the fuse element made from them is larger, producing more metal vapor during fusing, making them suitable only for fuses with low breaking capacity. High melting point materials, such as copper and silver, have high melting points and do not melt easily. However, due to their lower resistivity, they can be made with smaller cross-sectional sizes than low melting point fuse elements, producing less metal vapor during fusing, making them suitable for fuses with high breaking capacity. The shapes of fuse elements are divided into wire-like and strip-like. Changing the shape of the variable cross-section can significantly alter the fusing characteristics of the fuse. Fuses have various different fusing characteristic curves, suitable for the needs of different types of protected objects.

Feinmetall electrical component principle

An AC power supply that can provide a stable voltage and frequency is called an AC stabilized power supply. Most domestic manufacturers focus on AC voltage stabilization. Below is a brief description of the classification characteristics of AC stabilized power supplies available in the market. Parameter adjustment (resonance) type: The basic principle of voltage stabilization for this type of stabilized power supply is LC series resonance. Early magnetic saturation stabilizers belong to this category. Its advantages are: simple structure, few components, high reliability, wide stabilization range, strong anti-interference and overload resistance. The disadvantages are: high energy consumption, high noise, heavy weight, and high cost.

Feinmetall electrical component principle

Generators can convert mechanical energy into electrical energy, and dry cells can convert chemical energy into electrical energy. Generators and batteries themselves are not charged; their two poles have positive and negative charges respectively, generating voltage (current is formed by the directional movement of charges under the action of voltage). Charges already exist in conductors; to generate current, only voltage needs to be applied. When conductors are connected to the two poles of a battery, positive and negative charges are released to generate current. When the charges are exhausted, the current (and voltage) disappears. Dry cells and the like are called power sources. A device that converts AC to DC through transformers and rectifiers is called a rectified power supply. Electronic devices that can provide signals are called signal sources. Crystal transistors can amplify the signal sent from the previous stage and transmit the amplified signal to the subsequent circuit. For the subsequent circuit, the crystal transistor can also be regarded as a signal source. Rectified power supplies and signal sources are sometimes also called power sources.

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