FCT electronic electrical components Germany FCT electronic models FCT electronic prices

FCT electronic electrical components are varactor diodes, also known as "variable reactance diodes," manufactured 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 varactor diodes is generally small, with maximum values ranging from tens of pF to hundreds of pF. They are mainly used in high-frequency circuits for automatic tuning, frequency modulation, and phase adjustment, such as serving as variable capacitors in the tuning circuits of television receivers. 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, cartridge, 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, making them suitable for low-voltage outdoor use. Significant noise and light are produced in the atmosphere when interrupting current. In semi-enclosed fuses, the fusible element is mounted on a porcelain frame and inserted into a porcelain box with metal sockets at both ends, making them suitable for low-voltage indoor use. The noise and light produced during current interruption are contained by the porcelain box. In cartridge 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 the fusible element installed in an insulating tube made of solid gas-generating material. Solid gas-generating materials can include electrical anti-white cardboard or organic glass. When short-circuit current passes through the fusible element, it melts immediately, creating an arc. The high-temperature arc causes the solid gas-generating material to rapidly decompose, producing a large amount of high-pressure gas, which expels the ionized gas and arc from both ends of the tube, emitting significant 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: The electrodes of a fuel cell are the sites for electrochemical reactions where fuel undergoes oxidation and oxidant undergoes reduction. Their performance depends mainly on catalyst performance, electrode materials, and electrode manufacturing processes. 2, electrolyte membrane: The main function is to separate the oxidant from the reductant and conduct ions. 6, current collector: Also known as bipolar plates, they function to collect current, separate oxidant from reductant, and guide reaction gases. The performance of current collectors mainly depends on their 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; and rated short-circuit breaking current. Rated ultimate short-circuit breaking capacity refers to the ability of a low-voltage circuit breaker to operate normally again and interrupt the same short-circuit current once more after interrupting the maximum three-phase short-circuit current at its output terminals; the breaker does not guarantee normal connection and interruption thereafter. Rated service short-circuit breaking capacity refers to the ability of the circuit breaker to interrupt normally multiple times when the maximum three-phase short-circuit current occurs 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 trip for short-circuit) can achieve selective protection, and most main lines (including transformer output terminals) use them as main protection switches. Circuit breakers without short-time delay for short-circuit (only having long-time delay for overload and instantaneous trip for short-circuit) cannot provide selective protection and can only be used in branch circuits. "Marine Electrical Engineering" points out that for circuit breakers with three-stage protection, emphasis is placed on their service short-circuit breaking capacity value, while for circuit breakers used in branch lines, sufficient ultimate short-circuit breaking capacity must be ensured. A common bias is to choose larger values rather than appropriate ones, believing larger is safer. However, choosing excessively large values causes 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 appliance with overload, short-circuit, and undervoltage protection functions, capable of protecting lines 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: If the protection action connects the tripping circuit at any moment during the closing process, 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 the accident scope.

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