ESTA electrical components Germany ESTA model ESTA price

ESTA 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 resistor body material of a 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", and 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 an 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, surge current capacity, junction capacitance, response time, etc. The response time of a varistor is at the ns level, faster than gas discharge tubes, but slightly slower than TVS tubes. Generally, its response speed meets 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, making it unsuitable for direct application in the protection of high-frequency signal lines in many cases. 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 surge current capacity of a varistor is large, but smaller than that of gas discharge tubes. Varistors are abbreviated as VDR, and are voltage-sensitive nonlinear overvoltage protection semiconductor components.

ESTA electrical component composition

Internal accessories of circuit breakers: Auxiliary contacts are contacts mechanically linked with the opening and closing mechanism of the main circuit of the circuit breaker, mainly used to display the open/closed status of the circuit breaker. Connected to the control circuit of the circuit breaker, they implement control or interlocking on related electrical appliances through the opening and closing of the circuit breaker. Alarm contacts are used for accident alarms of the circuit breaker, and this contact only acts after the circuit breaker trips and opens. It is mainly used when the load of the circuit breaker experiences faults such as overload, short circuit, or undervoltage, causing free tripping. The alarm contact switches from the original normally open position to the closed position, connecting indicator lights, electric bells, buzzers, etc., in the auxiliary circuit to display or remind of the fault trip status of the circuit breaker. Since the probability of free tripping due to load faults is not high. Shunt release: A shunt release is a release excited by a voltage source, and its voltage is independent of the main circuit voltage. A shunt release is an accessory for remote operation of opening. When the power supply voltage is equal to any voltage between 70% and 110% of the rated control power supply voltage, the circuit breaker can be reliably opened. The shunt release operates in short-time duty, and the coil energization time generally cannot exceed 1S, otherwise the coil will be burned out. To prevent coil burnout in molded case circuit breakers, a microswitch is connected in series with the shunt release coil. When the shunt release attracts via the armature, the microswitch switches from normally closed to normally open. Since the control line of the shunt release power supply is cut off, even if the button is manually pressed, the shunt coil will not be energized again, thus avoiding coil damage. After the circuit breaker is reset and closed, the microswitch returns to the normally closed position. Undervoltage release: An undervoltage release is a release that causes the circuit breaker to open with or without delay when its terminal voltage drops to a specified range. Under thermal conditions, it should ensure reliable closing of the circuit breaker. Therefore, when a certain voltage drop occurs in the power supply voltage of the protected circuit, it can automatically open the circuit breaker to cut off the power, protecting the load appliances or electrical equipment downstream from undervoltage damage. During use, the undervoltage release coil is connected to the power side of the circuit breaker; the circuit breaker can only be closed after the undervoltage release is energized.

ESTA electrical component characteristics

Resolution refers to the ability of a sensor to detect the smallest change in the measured quantity. That is, if the input changes slowly from a non-zero value, the output of the sensor will not change until the input change exceeds a certain value, meaning the sensor cannot resolve this change in the input. Only when the change in the input exceeds the resolution will its output change. Usually, the resolution at various points within the full-scale range of a sensor is not the same, so the maximum change in input that causes a step change in output within the full scale is commonly used as the indicator for measuring resolution. If the above indicator is expressed as a percentage of the full scale, it is called resolution. Resolution has a negative correlation with the stability of the sensor.

ESTA 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. For some larger fixed inductors or adjustable inductors (such as oscillator coils, choke coils, etc.), enameled wire (or silk-covered wire) is mostly wound around the bobbin, and then magnetic cores, copper cores, or iron cores are inserted into the inner cavity of the bobbin to increase 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 known as formless coils or air 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 the turns 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); multi-layer windings include layered flat winding, random winding, honeycomb winding, and other methods. 3, Magnetic Core and Magnetic Rod: Magnetic cores and rods are generally made of nickel-zinc ferrite or manganese-zinc ferrite, and come in various shapes such as "I" shape, cylindrical, cap-shaped, "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. 12, Encapsulation Material: Some inductors (such as color-coded inductors, color-ring inductors, etc.) are sealed with encapsulation materials after winding to enclose the coil and magnetic core. Encapsulation materials include plastic or epoxy resin.

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