三菱 交流控制型电磁接触器；S-T35 AC400V 2A2B C
电磁式的继电器和接触器，它们的工作原理应该说是一样的。有时就是同一个器件，用在这个电路作为接触器，用到另外一个电路又作为继电器使用。如何区别呢？区别的方法就是看它们具体的用途了。
Electromagnetic relay and contactor should work the same way. Sometimes it's the same device, used in this circuit as contactor, using another circuit, and used as a relay. How do you make a difference The way to distinguish is to see their specific uses.
继电器的主要作用则是起信号检测、传递、变换或处理用的，它通断的电路电流通常较小，即一般用在控制电路（与“主电路”对比）。
The main function of the relay is to perform signal detection, transmission, transformation, or processing. It is usually used in the control circuit (compared with the "main circuit").
接触器主要作用是用来接通或断开主电路的。所谓主电路是指一个电路工作与否是由该电路是否接通为标志。主电路概念与控制电路相对应。一般主电路通过的电流比控制电路大。因此，就如一楼的朋友说的，容量大的接触器一般都带有灭弧罩（因为大电流断开会产生电弧，不采用灭弧罩灭弧，将烧坏触头）。
The main function of contactor is to connect or disconnect the main circuit. The main circuit is whether a circuit is working or not. It is a sign of whether the circuit is connected. The concept of the main circuit corresponds to the control circuit. The current of general main circuit is larger than that of control circuit. So, as a friend of the first floor said, a large contactor usually has an arc extinguisher (because a large current breaks a meeting to produce an arc, no arc hood is used to extinguish the arc, and the contact will be burned).
如果某个主电路工作电流较小，这时完全可以采用通常作为继电器用的电器来作为通断主电路的器件。即将继电器作为接触器使用。但若某个主电路工作电流非常大，以至于使用通断主电路的接触器容量非常大，要使这样的接触器工作的电流也非常大，也就是说它的控制电路中流过的电流非常大，用普通的继电器难以通断其控制电路。这时，可以选择某个原来作为接触器使用的电器来作为该控制电路的通断用，这个接触器在这个场合的作用就是继电器了。
If a main circuit has a smaller working current, it can be used as the main circuit of interruption. The relay is used as a contactor. But if a main circuit works very large current so that the contactor capacity of the main circuit is very large, so the current of the contactor is very large, that is to say, the current in the control circuit is very large, and it is difficult to use the ordinary relay to break the control circuit. At this point, an electrical appliance that is used as a contactor can be used as a switch for the control circuit. This contactor is a relay on this occasion.