FCT electronic electrical components German FCT electronic models FCT electronic prices

FCT electronic electrical components are varactor diodes, also known as "variable reactance diodes," made using the characteristic that the junction capacitance of a PN junction changes with applied voltage under reverse bias. As the reverse bias voltage increases, the junction capacitance decreases; conversely, it increases. The capacitance of a varactor diode is generally small, with maximum values ranging from tens of pF to hundreds of pF. It is mainly used in high-frequency circuits for automatic tuning, frequency modulation, and phase adjustment, such as serving as a variable capacitor in the tuning circuit of a television receiver. Main parameters include: zero-bias junction capacitance, zero-bias quality factor, reverse breakdown voltage, center reverse bias voltage, nominal capacitance, capacitance variation range (in picofarads), and cutoff frequency.

FCT electronic electrical component classification

Fuses can be classified into high-voltage fuses and low-voltage fuses based on operating voltage. Based on the protected object, they can be classified into fuses for protecting transformers and general electrical equipment, fuses for protecting voltage transformers, fuses for protecting power capacitors, fuses for protecting semiconductor components, fuses for protecting motors, and fuses for protecting household appliances. Based on structure, they can be classified into open-type, semi-enclosed, tube-type, and expulsion fuses. Open-type fuses have a simple structure, with the fusible element fully exposed to the air and supported by porcelain pillars without bases, suitable for low-voltage outdoor use. They produce significant noise and light in the atmosphere when interrupting current. Semi-enclosed fuses have their fusible elements mounted on porcelain frames and inserted into porcelain boxes with metal sockets at both ends, suitable for low-voltage indoor use. The noise and light produced during current interruption are blocked by the porcelain box. In tube-type fuses, the fusible element is installed inside the fuse body, which is then inserted into a base or directly connected to the circuit. The fuse element is a fully sealed insulating tube with metal caps or contact blades at both ends. If the insulating tube of this type of fuse is filled with quartz sand, it has a current-limiting effect during current interruption, greatly improving breaking capacity, hence it is also called a high-breaking-capacity fuse. If the tube is evacuated, it is called a vacuum fuse. If the tube is filled with SF6 gas, it is called an SF6 fuse, aimed at improving arc extinction performance. Since quartz sand, vacuum, and SF17 gas all have good insulation properties, this type of fuse is suitable for both low and high voltages. Expulsion fuses have their fusible elements installed in insulating tubes made of solid gas-generating materials. Solid gas-generating materials can include electrical anti-white cardboard or organic glass materials. When short-circuit current passes through the fusible element, it melts immediately, creating an arc. The high-temperature arc rapidly decomposes the solid gas-generating material, producing a large amount of high-pressure gas, which expels the ionized gas and arc from both ends of the tube, emitting intense noise and light, and extinguishing the arc when the AC current crosses zero, thereby interrupting the current. The insulating tube is usually mounted on an insulating support to form the complete fuse. Sometimes the upper end of the insulating tube is designed to be movable, detaching and dropping down immediately after current interruption. This type of expulsion fuse is commonly known as a drop-out fuse.

FCT electronic electrical component structure

1, electrodes are the sites in fuel cells where electrochemical reactions occur, with fuel undergoing oxidation and oxidant undergoing reduction. Their performance depends mainly on catalyst performance, electrode materials, and electrode manufacturing processes. 2, the main function of the electrolyte membrane is to separate the oxidant and reductant and conduct ions. 6, the current collector, also known as the bipolar plate, functions to collect current, separate oxidant and reductant, and guide reaction gases. The performance of the current collector mainly depends on its material properties, flow field design, and processing technology.

FCT electronic electrical component characteristics

The main characteristics of circuit breakers include: rated voltage; rated current; tripping current setting ranges for overload protection and short-circuit protection; rated short-circuit breaking current, etc. Rated ultimate short-circuit breaking capacity refers to the ability of a low-voltage circuit breaker to operate normally again and break the same short-circuit current once more after interrupting the maximum three-phase short-circuit current at its output terminals; however, the circuit breaker does not guarantee normal connection and disconnection thereafter. Rated service short-circuit breaking capacity refers to the ability of the circuit breaker to repeatedly and normally break the maximum three-phase short-circuit current occurring at its output terminals. Rated service short-circuit breaking capacity is a breaking current value lower than the rated ultimate short-circuit breaking current. Generally, circuit breakers with three-stage protection functions—long-time delay for overload, short-time delay for short-circuit, and instantaneous action for short-circuit—can achieve selective protection. Most main lines (including transformer output terminals) use them as main protection switches. Circuit breakers without short-time delay for short-circuit (having only long-time delay for overload and instantaneous action for short-circuit) cannot provide selective protection and can only be used in branch circuits. "Marine Electrical Engineering" points out that circuit breakers with three-stage protection emphasize their service short-circuit breaking capacity values, while circuit breakers used in branch lines must ensure sufficient ultimate short-circuit breaking capacity values. A common bias is to prefer larger values rather than appropriately matched ones, believing larger values offer greater safety. However, excessively large values cause unnecessary waste. Therefore, there is no need to blindly pursue high service short-circuit breaking capacity indicators for circuit breakers on branch lines. For circuit breakers used on main lines, they must meet not only the requirements for rated ultimate short-circuit breaking capacity but also those for rated service short-circuit breaking capacity. A circuit breaker is a basic low-voltage electrical device with overload, short-circuit, and undervoltage protection functions, capable of protecting circuits and power sources. The main technical indicators are rated voltage and rated current. Circuit breakers have different functions depending on the application, with many varieties and specifications, and numerous specific technical indicators. Free tripping of circuit breakers: At any moment during the closing process of a circuit breaker, if protective action connects the tripping circuit, the circuit breaker can reliably disconnect completely. This is called free tripping. Circuit breakers with free tripping ensure rapid disconnection when closing onto a short-circuit fault, preventing the expansion of accident scope.

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