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 the varistor is semiconductor, so it is a type of semiconductor resistor. The currently widely used "zinc oxide" varistor has a main body material 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, the varistor is called "surge absorber", sometimes also referred to as "electric shock (surge) suppressor (absorber)". 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 voltage value, thereby achieving protection for the subsequent circuit. The main parameters of the varistor include: varistor voltage, current handling capacity, junction capacitance, response time, etc. The response time of the varistor is ns level, faster than gas discharge tubes, slightly slower than TVS tubes; generally, its response speed can meet the requirements for overvoltage protection in electronic circuits. The junction capacitance of the 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, because its larger junction capacitance will increase leakage current, this needs to be fully considered in the design of protection circuits. The current handling capacity of the varistor is relatively large, but smaller than that of gas discharge tubes. Varistor is abbreviated as VDR, which is a voltage-sensitive nonlinear overvoltage protection semiconductor component.

ESTA electrical component composition

Internal accessories of circuit breaker: 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 in 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 alarm of the circuit breaker, and these contacts only act after the circuit breaker trips and opens. They are mainly used when the load of the circuit breaker experiences faults such as overload, short circuit, or undervoltage, causing free tripping. The alarm contact changes 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 very high. Shunt release: Shunt release is a release excited by a voltage source, and its voltage is independent of the main circuit voltage. 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. 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 micro switch is connected in series with the shunt release coil. When the shunt release attracts via the armature, the micro switch changes from normally closed to normally open. Since the control circuit 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 micro switch returns to the normally closed position. Undervoltage release: 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 of the circuit breaker from undervoltage damage. During use, the undervoltage release coil is connected to the power side of the circuit breaker; only after the undervoltage release is energized can the circuit breaker be closed.

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 quantity changes slowly from a non-zero value. When the input change value does not exceed a certain value, the output of the sensor will not change, meaning the sensor cannot resolve the change in this input quantity. Only when the change in the input quantity exceeds the resolution will its output change. Usually, the resolution at each point within the full scale range of the sensor is not the same, so the maximum change value in the input quantity that causes a step change in the 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, etc. 1, Bobbin: The bobbin generally refers to the support for winding the coil. For some larger fixed inductors or adjustable inductors (such as oscillator coils, choke coils, etc.), most involve winding enameled wire (or silk-covered wire) around the bobbin, and then inserting magnetic cores, copper cores, iron cores, etc., into the inner cavity of the bobbin to increase their 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 the 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 adjacent to each other) 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 nickel-zinc ferrite or manganese-zinc ferrite materials, and come in various shapes such as "I" shape, cylindrical, cap-shaped, "E" shape, pot shape, etc. 4, Iron Core: Iron core materials mainly include silicon steel sheets, permalloy, etc., and their shape is mostly "E" type. 5, Shielding Cover: To avoid the magnetic field generated by some inductors during operation affecting the normal operation of other circuits and components, a metal shielding cover is added (such as oscillator coils in semiconductor radios). Inductors using 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, enclosing the coil and magnetic core. Encapsulation materials include plastic or epoxy resin, etc.

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