CWS electrical components Germany CWS model CWS price

CWS electrical components are switches controlled by electromagnets, that is, a combination of an electromagnet and a switch. When the electromagnet coil is energized, it generates electromagnetic attraction, causing the movable iron core to push or pull the switch contacts to close, thereby connecting the controlled circuit. Electromagnetic switches are widely used in various industries, most commonly as contactors in the industrial sector. An electromagnetic switch is the control switch on a starter motor and is one of the three main components of a starter motor (DC motor, transmission engagement mechanism, electromagnetic switch). Its working principle is that when the coil is energized, it generates electromagnetic attraction, causing the movable iron core to move, thereby pulling the transmission engagement mechanism to move the starter pinion forward to engage with the engine flywheel ring gear, and on the other hand pushing the switch contacts to connect, causing the DC motor to be energized and operate, thereby driving the engine to start.

CWS electrical components applications

Inductors in circuits mainly serve functions such as filtering, oscillation, delay, and wave trapping, as well as signal selection, noise filtering, current stabilization, and suppression of electromagnetic interference. The most common function of an inductor in a circuit is to form an LC filter circuit together with a capacitor. Capacitors have the characteristic of "blocking DC and passing AC," while inductors have the function of "passing DC and blocking AC." If DC power accompanied by many interference signals passes through an LC filter circuit, the AC interference signals will be converted into heat energy by the inductor and consumed; when the relatively pure DC current passes through the inductor, the AC interference signals within it are also converted into magnetic induction and heat energy. Higher frequencies are more easily impeded by the inductor's impedance, which can suppress higher-frequency interference signals. Inductors have the characteristic of blocking AC while allowing DC to pass smoothly; the higher the frequency, the greater the coil impedance. Therefore, the main functions of inductors are to isolate and filter AC signals, or to form resonant circuits with capacitors, resistors, and other components.

CWS electrical components classification

Fuses can be divided into high-voltage fuses and low-voltage fuses according to the operating voltage. According to the protected object, they can be divided 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, etc. According to structure, they can be divided into open-type, semi-enclosed, tube-type, and expulsion-type fuses. Open-type fuses have a simple structure, with the fusible element completely exposed to the air and supported by porcelain pillars without a base, suitable for low-voltage outdoor use. They produce significant sound and light in the atmosphere when interrupting current. Semi-enclosed fuses have their fusible elements mounted on porcelain frames, inserted into porcelain boxes with metal sockets at both ends, suitable for low-voltage indoor use. The sound 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. It is then inserted into a base or directly connected to the circuit for use. The fuse element is a fully sealed insulating tube with metal caps on both ends or equipped with contact blades. If the insulating tube of this type of fuse is filled with quartz sand, it has a current-limiting effect when interrupting current, which can greatly improve the breaking capacity, so 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, the purpose of which is to improve arc extinguishing performance. Since quartz sand, vacuum, and SF13 gas all have good insulation properties, this type of fuse is suitable for both low voltage and high voltage. Expulsion-type fuses have the fusible element installed in an insulating tube made of solid gas-generating material. The solid gas-generating material can be electrical anti-white cardboard or organic glass material, etc. When short-circuit current passes through the fusible element, the element melts immediately, producing an electric arc. The high-temperature arc causes the solid gas-generating material to rapidly decompose and produce a large amount of high-pressure gas, thereby ejecting the ionized gas with the electric arc from both ends of the tube, emitting intense sound and light, and extinguishing the arc when the AC current crosses zero, thus interrupting the current. The insulating tube is usually mounted on an insulating support to form the complete fuse assembly. Sometimes the upper end of the insulating tube is made movable, detaching and dropping immediately after current interruption. This type of expulsion fuse is commonly known as a drop-out fuse.

CWS electrical components characteristics

The so-called dynamic characteristics refer to the output characteristics of a sensor when the input changes. In practical work, the dynamic characteristics of a sensor are often expressed by its response to certain standard input signals. This is because the sensor's response to standard input signals is easy to obtain through experimental methods, and there is a certain relationship between its response to standard input signals and its response to arbitrary input signals; often, knowing the former allows one to deduce the latter. The most commonly used standard input signals are step signals and sinusoidal signals, so the dynamic characteristics of sensors are also often expressed by step response and frequency response.

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