Polytec electrical components Germany Polytec model Polytec price

Polytec electrical components are constituent parts of electronic components and small electrical machines and instruments. They often consist of several parts and are interchangeable within similar products. The term commonly refers to certain parts in the electrical appliance, radio, and instrumentation industries. In practice, electronic components is the collective term for components and devices.

Polytec electrical component characteristics

The main characteristics of circuit breakers include: rated voltage; rated current; tripping current setting range 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 continue normal operation and break this short-circuit current one more time after interrupting the maximum three-phase short-circuit current at its output terminals. The circuit breaker does not guarantee whether it can normally connect and break thereafter. Rated service short-circuit breaking capacity refers to the circuit breaker's ability to break 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. Most main lines (including transformer output terminals) use them as main protection switches. Circuit breakers without short-time delay for short-circuit function (having only two-stage protection: long-time delay for overload and instantaneous trip for short-circuit) cannot provide selective protection and can only be used on 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 on branch lines, sufficient ultimate short-circuit breaking capacity must be ensured. A common bias is to prefer larger values rather than appropriately matched ones, under the assumption that larger is safer. 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: If the protective action closes the tripping circuit at any moment during the closing process, the circuit breaker can reliably open. This is called free-tripping. Circuit breakers with free-tripping ensure rapid disconnection in case of a short-circuit fault during closing, preventing the expansion of the accident scope.

Polytec electrical component structure

Some gas discharge tubes use glass as the encapsulation shell, while others use ceramic. The discharge tube is filled with inert gases with stable electrical properties (such as argon and neon). Common discharge tubes have two or three electrodes, separated by inert gas. Based on the number of electrodes, discharge tubes are classified into two-electrode and three-electrode types. Ceramic two-electrode discharge tubes consist mainly of pure iron electrodes, nickel-chromium-cobalt alloy caps, silver-copper welding caps, and ceramic tube bodies. Radioactive oxides are coated on the discharge electrodes inside the tube, and radioactive elements are coated on the inner wall of the tube body to improve discharge characteristics. Discharge electrodes mainly come in rod and cup structures. In discharge tubes with rod electrodes, a cylindrical heat shield is installed between the electrode and the tube wall. This heat shield ensures uniform heating of the ceramic tube body, preventing local overheating and tube fracture. The heat shield is also coated with radioactive oxides to further reduce discharge dispersion. In discharge tubes with cup electrodes, a molybdenum mesh is installed at the cup opening, and cesium element is placed inside the cup, also serving to reduce discharge dispersion. Three-electrode discharge tubes are also composed of pure iron electrodes, nickel-chromium-cobalt alloy caps, silver-copper welding caps, and ceramic tube bodies. Unlike two-electrode discharge tubes, three-electrode discharge tubes include a nickel-chromium-cobalt alloy cylinder as the third electrode, i.e., the ground electrode.

Polytec electrical component classification

1, classified by operating nature, can be divided into transmitting antennas and receiving antennas. 2, classified by usage, can be divided into communication antennas, broadcast antennas, television antennas, radar antennas, etc. 3, classified by directionality, can be divided into omnidirectional antennas and directional antennas, etc. 4, classified by operating wavelength, can be divided into ultra-long wave antennas, long wave antennas, medium wave antennas, short wave antennas, ultra-short wave antennas, microwave antennas, etc. 5, classified by structural form and operating principle, can be divided into wire antennas and aperture antennas, etc. Characteristic parameters describing antennas include radiation pattern, directivity coefficient, gain, input impedance, radiation efficiency, polarization, and bandwidth. 6, classified by dimension, can be divided into two types: (1) One-dimensional antennas consist of many wires, which may be straight lines like those used in mobile phones, or clever shapes like the old "rabbit ear" antennas used on televisions before cable TV. Monopole and dipole antennas are the two most basic one-dimensional antennas. (2) Two-dimensional antennas: Diverse forms, including patch (a square piece of metal), array (an organized two-dimensional pattern of patches), horn, and dish. 9, antennas can be divided into three major categories based on application scenarios: handheld transceiver antennas, vehicle-mounted antennas, and base station antennas. Handheld transceiver antennas: Antennas for personal use with handheld walkie-talkies, commonly rubber antennas and telescopic antennas. Vehicle-mounted antennas: Communication antennas originally designed for installation on vehicles, with suction cup antennas being the most common and widely applied. Vehicle-mounted antenna structures also include shortened types, quarter-wavelength, center-loaded, five-eighths wavelength, and half-wave dipole types. Base station antennas: Play a critical role in the entire communication system, especially for communication hubs. Common base station antennas include fiberglass high-gain antennas, four-loop array antennas (eight-loop array antennas), and directional antennas.

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