在强电作用下，绝缘物质可能被击穿而丧失其绝缘性能。气体绝缘物质与液体绝缘物质被击穿后，一旦去掉外界因素（强电场）后即可自行恢复其应有的电气绝缘性能；而固体绝缘物质被击穿后则不可逆地完全丧失了其电气绝缘性能。因此电气线路与设备的绝缘选择必须与电压等级相配合，而且须与使用环境及运行条件相适应，以保证绝缘的安全作用。

Under the action of strong electricity, insulating materials may be broken down and lose their insulating properties. After the breakdown of gas insulating materials and liquid insulating materials, once external factors (strong electric field) are removed, their proper electrical insulation performance can be restored automatically; When solid insulating materials are broken down, they irreversibly and completely lose their electrical insulation properties. Therefore, the insulation selection of electrical lines and equipment must match the voltage level, and must be adapted to the operating environment and operating conditions to ensure the safety of insulation.

光电耦合器的输入阻抗很小，只有几百欧姆，而干扰源的阻抗较大，通常为105～106Ω。据分压原理可知，即使干扰电压的幅度较大，但馈送到光电耦合器输入端的杂讯电压会很小，只能形成很微弱的电流，由于没有足够的能量而不能使二极体发光，从而被抑制掉了。

The input impedance of the photocoupler is very small, only a few hundred ohms, while the impedance of the interference source is large, usually 105 to 106 ohms. According to the voltage division principle, even if the amplitude of the interference voltage is large, the noise voltage fed to the input terminal of the photocoupler will be very small, only forming a very weak current. Due to insufficient energy, the diode cannot emit light, which is suppressed.

光电耦合器的输入回路与输出回路之间没有电气联系，也没有共地；之间的分布电容极小，而绝缘电阻又很大，因此回路一边的各种干扰杂讯都很难通过光电耦合器馈送到另一边去，避免了共阻抗耦合的干扰信号的产生。

There is no electrical connection or common ground between the input circuit and the output circuit of the photocoupler; The distributed capacitance between them is very small, and the insulation resistance is very large. Therefore, various interference and noise on one side of the circuit are difficult to be fed to the other side through the optocoupler, avoiding the generation of interference signals due to common impedance coupling.

光电耦合器可起到很好的安全保障作用，即使当外部设备出现故障，甚至输入信号线短接时，也不会损坏仪表。因为光耦合器件的输入回路和输出回路之间可以承受几千伏的高压。光电耦合器的回应速度极快，其回应延迟时间只有10μs左右，适于对回应速度要求很高的场合。

Photocouplers can play a good security role, even when external equipment fails, or even when the input signal line is shorted, they will not damage the instrument. Because the optical coupling device can withstand a high voltage of several thousand volts between the input circuit and the output circuit. The response speed of the photocoupler is extremely fast, with a response delay time of only 10 μ About s, suitable for occasions where response speed is highly required.

推荐一款由工采网代理的来自台湾美禄的光耦合器，首先是光耦 － MPC101X，MPC101X系列结合了砷化铝镓红外发射二极管作为发射极，该发射极管光学耦合到塑料LSOP4封装中的硅平面光电晶体管探测器，具有不同的铅形成选项。MPC101X系列具有坚固的共面双模子结构，具有最稳定的隔离特性。

Recommend a type of optocoupler from Meilu, Taiwan, represented by Gongcai. Firstly, the optocoupler MPC101X series combines an aluminum gallium arsenide infrared emitter diode as the emitter, which is optically coupled to a silicon planar phototransistor detector in a plastic LSOP4 package, with different lead formation options. The MPC101X series has a robust coplanar dual mold structure with the most stable isolation characteristics.

光耦合器属光电器件中之一环，系一发光及受光元件的组合体，借由光的传输达到导通的要求，为一理想的绝缘体，因此在许多电子电器产品上，皆采用此器件作为【高压隔离】用途。发光器件通常为发光二极体，受光器件通常在低阶产品为光二級管／光三級管／光晶閘管，高阶产品为光耦合積體電路。

Optocoupler is a ring in optoelectronic devices, which is a combination of light emitting and light receiving components. It is an ideal insulator for achieving the requirements of conduction through the transmission of light. Therefore, in many electronic and electrical products, this device is used for [high voltage isolation] purposes. The light emitting device is usually a light-emitting diode, the light receiving device is usually an optical diode/optical triode/optical thyristor in the lower order product, and the higher order product is an optocoupler integrated circuit.