cosmo electrical components Germany cosmo model cosmo price

cosmo electrical components are current fuses that provide overload protection. When a circuit fault or abnormality occurs, the current continues to rise. This rising current may damage certain important components in the circuit, burn out the circuit, or even cause a fire. If a fuse is correctly installed in the circuit, it will melt and cut off the current when the current abnormally rises to a certain level and temperature, thereby protecting the safe operation of the circuit. With the fuse correctly installed in the circuit, the fuse will melt and cut off the current when the current abnormally rises to a certain level and temperature, protecting the safe operation of the circuit. The fuse invented by Edison was used to protect expensive incandescent lamps at the time. With the development of the times, fuses protect power equipment from damage due to overcurrent and overheating, avoiding serious damage to electronic equipment caused by internal faults.

cosmo electrical component types

For different application scenarios, the purpose of applying varistors varies, and the voltage/current acting on the varistor is not the same; therefore, the requirements for the varistor also differ. Paying attention to these differences is very important for correct use. According to different purposes, varistors can be divided into two main categories: ① varistors for protection, and ② varistors for circuit functions. Protection resistors: (1) Distinguish whether it is a varistor for power supply protection or a varistor for signal line and data line protection, as they must meet different technical standard requirements. (2) According to the different continuous operating voltages applied to the varistor, varistors across power lines can be divided into two types: AC type and DC type. The aging characteristics of varistors under these two voltage stresses are different. (3) According to the different abnormal overvoltage characteristics withstand by the varistor, varistors can be divided into three types: surge suppression type, high-power type, and high-energy type. 1. Surge suppression type varistors refer to varistors used to suppress transient overvoltages such as lightning overvoltage and switching overvoltage. The occurrence of this transient overvoltage is random and non-periodic, and the peak current and voltage may be very high. The vast majority of varistors belong to this category. 2. High-power type varistors refer to varistors used to absorb continuous pulse groups that appear periodically, such as varistors connected in parallel to switching power supply converters. Here, the impulse voltage appears periodically, and the period is known. The energy value can generally be calculated. The voltage peak is not large, but due to the high frequency of occurrence, the average power is quite large. 6. High-energy type varistors refer to varistors used to absorb magnetic energy in large inductive coils such as generator excitation coils and lifting electromagnet coils. For such applications, the main technical indicator is energy absorption capacity. The protective function of varistors can be repeated many times in most application scenarios, but sometimes they are made into "one-time" protective devices like current fuses. For example, varistors with short-circuit contacts connected in parallel to the loads of certain current transformers.

cosmo electrical component structure

Inductors are generally composed of bobbins, windings, shielding covers, encapsulation materials, magnetic cores, or iron cores. 1, Bobbin: The bobbin refers to the support for winding the coil. Most large-volume fixed inductors or adjustable inductors (such as oscillator coils, choke coils, etc.) have enameled wire (or silk-covered wire) wound around the bobbin, and then a magnetic core, copper core, or iron core is inserted into the inner cavity of the bobbin to increase its inductance. Bobbins are usually made of plastic, bakelite, or ceramic, and can be made into different shapes according to actual needs. Small inductors (such as color-coded inductors) generally do not use bobbins but directly wind enameled wire around the magnetic core. Air-core inductors (also called formless coils or air-core coils, mostly used in high-frequency circuits) do not use magnetic cores, bobbins, or shielding covers. Instead, they are wound on a mold first, then the mold is removed, and a certain distance is maintained between each turn of the coil. 2, Winding: The winding refers to a set of coils with specified functions, which is the basic component of an inductor. Windings are divided into single-layer and multi-layer types. Single-layer windings have two forms: close-wound (wires are wound circle by circle) and spaced-wound (a certain distance is kept between each turn of wire during winding); multi-layer windings include layered flat winding, random winding, honeycomb winding, and other methods. 3, Magnetic Core and Magnetic Rod: Magnetic cores and magnetic rods are generally made of materials such as nickel-zinc ferrite or manganese-zinc ferrite. They come in various shapes such as "I" shape, columnar shape, cap shape, "E" shape, and pot shape. 4, Iron Core: Iron core materials mainly include silicon steel sheets and permalloy, and their shape is mostly "E" type. 5, Shielding Cover: To prevent the magnetic field generated by some inductors during operation from affecting the normal operation of other circuits and components, a metal shielding cover is added (such as the oscillator coil of a semiconductor radio). Inductors with shielding covers will increase coil loss, reducing the Q value. 15, Encapsulation Material: Some inductors (such as color-coded inductors and color-ring inductors) are sealed with encapsulation materials after winding to enclose the coil and magnetic core. The encapsulation material uses plastic or epoxy resin.

cosmo electrical component principle

The absorption film irradiated by infrared rays is a thin film with small heat capacity and easy temperature rise. A cavity structure is located at the lower part close to the center of the substrate. This structural design ensures the temperature difference between the cold end and the measuring end. The thermocouple is composed of polysilicon and aluminum, connected in series. When the temperature at the measuring end of each thermocouple rises, a thermoelectromotive force Vn is generated between the thermocouples, so the sum of their voltages can be obtained at the output terminal.

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