ABB 微型断路器 SH202-C20 OV；1014739

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继电器是具有隔离功能的自动开关元件，广泛应用于遥控、遥测、
The relay is an automatic switch element with isolation function, which is widely used in remote control, telemetry, and remote sensing.

通讯、自动控制、机电一体化及电力电子设备中，是最重要的控制元件之一。
In communication, automatic control, electromechanical integration and power electronic equipment, it is one of the most important control elements.
继电器一般都有能反映一定输入变量（如电流、电压、功率、阻抗、频率、温度、压力、速度、光等）的感应机构（输入部分）；有能对被控电路实现“通”、“断”控制的执行机构（输出部分）；在继电器的输入部分和输出部分之间，还有对输入量进行耦合隔离，功能处理和对输出部分进行驱动的中间机构（驱动部分）。
The relay generally reflects the input variables (such as current, voltage, power, frequency, impedance, temperature, pressure, speed and light) of the induction mechanism (input); to the controlled circuit on and off control actuator (output) between the input part; and the output part of the relay, and are coupled to the input isolation function, treatment and mechanism of the middle part of the output (driver).
作为控制元件，概括起来，继电器有如下几种作用：
As a control element, the relay has several functions as follows:
1）扩大控制范围：例如，多触点继电器控制信号达到某一定值时，可以按触点组的不同形式，同时换接、开断、接通多路电路。
1) expand the control range: for example, when the control point of a multi contact relay reaches a certain value, it can be changed according to different forms of contact groups, and at the same time replace, break and connect multiple circuits.
2）放大：例如，灵敏型继电器、中间继电器等，用一个很微小的控制量，可以控制很大功率的电路。
2) magnification: for example, sensitive relays, intermediate relays, and so on, with a very small control amount that can control a large power circuit.
3）综合信号：例如，当多个控制信号按规定的形式输入多绕组继电器时，经过比较综合，达到预定的控制效果。
3) comprehensive signal: for example, when multiple control signals are entered into a multi winding relay in a prescribed form, the desired control effect is achieved through a comparative synthesis.
4）自动、遥控、监测：例如，自动装置上的继电器与其他电器一起，可以组成程序控制线路，从而实现自动化运行。
4) automatic, remote control and monitoring: for example, the relay on the automatic device can be programmed together with other electrical appliances to realize automatic operation.
  

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