knipex-werk electrical components Germany knipex-werk model knipex-werk price

knipex-werk electrical component is a resistive device with nonlinear voltage-current characteristics, mainly used for voltage clamping when the circuit is subjected to overvoltage, absorbing excess current to protect sensitive devices. The resistive body material of the varistor is semiconductor, so it is a type of semiconductor resistor. The currently widely used "zinc oxide" varistor has a main body composed of divalent element zinc and hexavalent element oxygen. Therefore, from a material perspective, the zinc oxide varistor is a "II-VI group oxide semiconductor". In Taiwan, China, varistors are called "surge absorbers", sometimes also referred to as "electric shock (surge) suppressors (absorbers)". A varistor is a voltage-limiting protection device. Utilizing the nonlinear characteristics of the varistor, when overvoltage appears between the two poles of the varistor, the varistor can clamp the voltage to a relatively fixed value, thereby achieving protection for the downstream circuit. The main parameters of a varistor include: varistor voltage, current handling capacity, junction capacitance, response time, etc. The response time of a varistor is in the ns range, faster than gas discharge tubes, but slightly slower than TVS tubes. Generally, its response speed can meet the requirements for overvoltage protection in electronic circuits. The junction capacitance of a varistor is generally in the range of hundreds to thousands of Pf, and in many cases it is not suitable for direct application in the protection of high-frequency signal lines. When applied in AC circuit protection, its larger junction capacitance will increase leakage current, which needs to be fully considered in the design of protection circuits. The current handling capacity of a varistor is relatively large, but smaller than that of gas discharge tubes. Varistors are abbreviated as VDR, and are voltage-sensitive nonlinear overvoltage protection semiconductor components.

knipex-werk electrical component applications

Photoelectric sensors using photoelectric elements as sensitive components come in various types and have wide applications. According to the nature of the output quantity of photoelectric sensors, they can be divided into two categories: (1) Photoelectric measuring instruments that convert the measured quantity into a continuously changing photocurrent, which can be used to measure physical quantities such as light intensity, object temperature, light transmission capability, displacement, and surface condition. For example: illuminance meters for measuring light intensity, photoelectric pyrometers, photoelectric colorimeters and turbidimeters, photoelectric alarms for fire prevention, and automatic inspection devices and instruments for checking the diameter, length, ovality, and surface roughness of processed parts, all of which use photoelectric elements as sensitive components. Semiconductor photoelectric elements are not only widely used in the civil industrial field, but also hold an important position in military applications. For example, lead sulfide photoresistors can be used to make infrared night vision devices, infrared cameras, and infrared navigation systems; (8) Converting the measured quantity into a continuously changing photocurrent. Various photoelectric automatic devices are made by utilizing the characteristic of photoelectric elements to output "yes" or "no" electrical signals when exposed to light or no light. Photoelectric elements are used as switch-type photoelectric conversion elements. For example, photoelectric input devices for electronic computers, switch-type temperature regulation devices, and digital photoelectric tachometers for speed measurement, etc.

knipex-werk electrical component principle

When current flows through a conductor, the conductor will heat up due to its certain resistance. The heat generation follows this formula: Q=I2RT; where Q is the heat generated, 0.33 is a constant, I is the current flowing through the conductor, R is the resistance of the conductor, and T is the time the current flows through the conductor; from this formula, we can easily understand the simple working principle of a fuse. When the material and shape of the fuse are determined, its resistance R is relatively determined (if its temperature coefficient of resistance is not considered). When current flows through it, it generates heat, and the heat generation increases with time. The magnitude of current and resistance determines the rate of heat generation, while the construction of the fuse and its installation conditions determine the rate of heat dissipation. If the rate of heat generation is less than the rate of heat dissipation, the fuse will not blow. If the rate of heat generation equals the rate of heat dissipation, it will not blow for a considerable period of time. If the rate of heat generation is greater than the rate of heat dissipation, the generated heat will accumulate. Due to its specific heat and mass, the increase in heat manifests as a rise in temperature. When the temperature rises above the melting point of the fuse, the fuse blows. This is the working principle of a fuse. From this principle, we should know that you must carefully study the physical properties of the selected materials and ensure they have consistent geometric dimensions when designing and manufacturing fuses. Because these factors play a crucial role in whether the fuse can work properly. Similarly, when using it, you must install it correctly.

knipex-werk electrical component composition

Transformer components include the core assembly (core, windings, insulation, leads), transformer oil, tank and cooling device, voltage regulation device, protection devices (breather, safety airway, gas relay, oil conservator and temperature measuring device, etc.), and outlet bushings. Specific composition and functions: ① The core is the main magnetic circuit part of the transformer. It is usually made of stacked hot-rolled or cold-rolled silicon steel sheets with high silicon content and insulated with varnish on the surface. The core is divided into two parts: the core column and the yoke. The core column is covered with windings; the yoke is used to close the magnetic circuit. ② The winding is the circuit part of the transformer, wound with double-silk insulated flat wire or enamel-coated round wire. The basic principle of a transformer is electromagnetic induction. Taking a single-phase two-winding transformer as an example to explain its basic working principle: when voltage is applied to the primary winding, current flows, generating alternating magnetic flux in the core. This flux is called the main flux. Under its action, electromotive forces are induced in the windings on both sides, finally driving the transformer control device.

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