UR8AH  CT/VT模块  用于自动控制电路中

UR8AH 通用继电器系列的CT/VT模块，GE Multilin的UR- 8ah为UR继电器提供三个1A/5A相CT, 1A/5A接地CT和4个VT。

继电器是一种电子控制器件，它具有控制系统（又称输入回路）和被控制系统（又称输出回路），通常应用于自动控制电路中，它实际上是用较小的电流去控制较大电流的一种“自动开关”。故在电路中起着自动调节、安全保护、转换电路等作用。

UR8AH 继电器是一种电子控制器件，它利用较小的电流去控制较大电流的一种“自动开关”。它的工作原理是：当输入量达到规定值时，输出量发生突然的变化。

UR8AH 继电器的输入量可以是各种物理量，如电压、电流、温度、压力、速度等，输出量则是触点的动作或电参数的变化。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、扩大等功能的中间机构。

继电器在电路中具体起到了以下作用：

- 自动调节作用：继电器可以用较小的电流去控制较大电流的一种“自动开关”，在电路中起到自动调节的作用。例如，在电动机控制电路中，当电动机的转速低于规定值时，继电器的触点接通，使电动机的转速上升；当电动机的转速高于规定值时，继电器的触点断开，使电动机的转速下降。

- 安全保护作用：继电器可以在电路中起到安全保护的作用。例如，在电动机控制电路中，当电动机过载时，继电器的触点断开，使电动机停止运转，避免电动机因过载而损坏。

- 转换电路作用：UR8AH 继电器可以在电路中起到转换电路的作用。例如，在电动机控制电路中，继电器的触点可以通过转换电路，将电动机的启动电路和停止电路连接起来，实现电动机的启动和停止控制。

- 逻辑控制作用：继电器可以实现逻辑控制。例如，在电梯控制电路中，继电器的触点可以通过逻辑控制电路，实现电梯的上行、下行、停止等控制。

总之，UR8AH 继电器在电路中起到了自动调节、安全保护、转换电路、逻辑控制等作用，是一种非常重要的电子控制器件。

UR8AH  CT/VT模块  用于自动控制电路中

UR8AH General Purpose Relay series of CT/VT modules, GE Multilin's UR-8AH provides three 1A/5A phase CT, 1A/5A ground CT and 4 VT for UR relays.

Relay is an electronic control device, it has a control system (also known as the input loop) and the controlled system (also known as the output loop), usually used in automatic control circuit, it is actually a small current to control the larger current of an "automatic switch". Therefore, it plays the role of automatic regulation, safety protection and conversion circuit in the circuit.

The UR8AH relay is an electronic control device that uses a smaller current to control a larger current as an "automatic switch". It works on the principle that when the input reaches a specified value, the output changes suddenly.

The input of the UR8AH relay can be a variety of physical quantities, such as voltage, current, temperature, pressure, speed, etc., and the output is the action of the contact or the change of electrical parameters. Between the input part and the output part of the relay, there is an intermediate mechanism for coupling, isolating, expanding and other functions of the input.

Relays play the following roles in the circuit:

- Automatic regulation: The relay can use a small current to control a large current of an "automatic switch", in the circuit to play an automatic regulation role. For example, in the motor control circuit, when the speed of the motor is lower than the specified value, the contact of the relay is connected to make the speed of the motor rise; When the speed of the motor is higher than the specified value, the contact of the relay is disconnected, and the speed of the motor is reduced.

- Safety protection: The relay can play a safety protection role in the circuit. For example, in the motor control circuit, when the motor is overloaded, the contact of the relay is disconnected, so that the motor stops running and avoid damage to the motor due to overload.

- Conversion circuit function: UR8AH relay can play the role of conversion circuit in the circuit. For example, in the motor control circuit, the contact of the relay can connect the start circuit and stop circuit of the motor through the conversion circuit to realize the start and stop control of the motor.

- Logic control function: The relay can realize logic control. For example, in the elevator control circuit, the contact of the relay can realize the up, down and stop control of the elevator through the logic control circuit.

In short, the UR8AH relay plays an automatic regulation, safety protection, conversion circuit, logic control and other functions in the circuit, and is a very important electronic control device.