这是因为交流接触器的吸合线圈的工作额定电压，要求不同。我国低压供电方式大都为三相四线制，(三根火线称相线L1L2L3，零线N与任一相线的电压为220V，俗称相电压。相线与相线之间的称为线电压，均为380V)。

This is because the rated voltage of the pull-in coil of AC contactor is different. China's low-voltage power supply mode is mostly three-phase four wire system (three live wires are called phase line l1l2l3, and the voltage between zero line N and any phase line is 220 V, commonly known as phase voltage). The voltage between phase lines is called line voltage (380V).

现在交流接触器的型号都根据GB14048.4和IEC60947-4-1标准，重新划分了。将交流接触器AC系列分为以下几类。

Now the models of AC contactors are re classified according to the standards of gb14048.4 and iec60947-4-1. AC contactor AC series are divided into the following categories.

①AC-1类接触器是用来控制无感或微感电路的.

① Ac-1 contactor is used to control non inductive or micro inductive circuit

②AC-2类接触器是用来控制绕线式异步电动机的启动和分断的.

② AC - 2 contactor is used to control the starting and breaking of wound induction motor

③AC-3和AC-4接触器可用于频繁控制异步电动机的启动和分断。常用的交流接触器CJ10、CJ40、CJ12、CJ20和CDC1、CDC3-9~110Ⅴ、CJX1.、CDX1.、CDX2、CDC7系列等等。

③ AC-3 and AC-4 contactors can be used to frequently control the starting and breaking of asynchronous motors. Commonly used AC contactors CJ10, CJ40, cj12, cj20 and cdc1, cdc3-9 ~ 110 V, cjx1., Cdx1., CDX2, cdc7 series, etc.

常用的有交流(AC)24V、36V、110V、220Ⅴ、380V。它是根据接触器的工作环境和工作条件来生产的。

Commonly used are AC 24 V, 36 V, 110 V, 220 V, 380 v. It is produced according to the working environment and conditions of the contactor.

它只是接触器吸合线圈(A1、A2)的电压值不同，其工作原理完全一样。

It is just that the voltage value of the contactor pull-in coil (A1, A2) is different, and its working principle is exactly the same.

常用的交流接触器线圈的端子标号用A1.、A2标注。如上图所示，它为一只线圈为380V工作电压的交流接触器，按图中，将A2与三相交流电连接，A1端子与启动按钮的常开。

The terminal mark of common AC contactor coil is marked with A1. And A2. As shown in the figure above, it is an AC contactor with a coil of 380V working voltage. According to the figure, A2 is connected with three-phase AC, and terminal A1 is normally open with the start button.

2连接，利用接触器的主触头来完成自锁功能(实际工作电路中是利用交流接触器的一对常开辅助触头)。这里只简化说接触器的工作原理而为之。

The main contact of the contactor is used to complete the self-locking function (in the actual working circuit, a pair of normally open auxiliary contacts of the AC contactor are used). Here, the working principle of contactor is simplified.

当按下启动按钮，电流从按钮的1常开点流向2→到停止按钮2→按钮的常闭→3，此时交流接触器得电吸合。完成一个启动的闭合回路。一断吸合，马上可以放开启动按钮，自锁由交流接触器的主触头完成任务。

When the start button is pressed, the current flows from the normally open point of the button 1 to the normally closed point of the button 2 → to the stop button 2 → to the normally closed point of the button 3. At this time, the AC contactor is powered on. Complete a start-up closed loop. As soon as the switch is closed, the start button can be released immediately, and the self-locking task is completed by the main contact of AC contactor.

停机时只需要按一下停止按钮(2~3)，它由原来的常闭变为常开，这时交流接触器线圈失电释放主触头，由制造时的压簧将E型硅钢铁顶起，电动机停止旋转。

When the machine stops, it only needs to press the stop button (2 ~ 3), which changes from the original normally closed to normally open. At this time, the coil of AC contactor loses power and releases the main contact. The E-type silicon steel is jacked up by the pressure spring during manufacturing, and the motor stops rotating.