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，它们的工作原理是一样的。
Electromagnetic relay and contactor, they work the same principle.
继电器的主要作用是 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，一般用在控制电路里，控制弱信号。接触器主要作用是用来接通或断开主电路的。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。容量大的接触器一般都带有灭弧罩。继电器的触头容量一般不会超过5A，小型继电器的触头容量一般只有1A或2A，而接触器的触头容量最小的也有9A；接触器的触头通常有三对主触头（主触头都是常开触头）另外还有几对辅助触头，而继电器的触头一般不分主辅；继电器的触头有时是成对设置的，即常开触头和常闭触头组合在一起，而接触器不成对设置；继电器针对特定的要求，会与其它装置组合设计成时间继电器、计数器，压力继电器等等，有附加功能，而接触器一般没有。
The main function of the relay is to detect, transfer, transform or handle the signal. It is usually used in the control circuit to control the weak signal. 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. The contactor with large capacity is usually equipped with an arc extinguisher. The contact capacity of the relay is generally not more than 5A, and the contact capacity of the small relay is generally only 1A or 2A, and the touch capacity of the contactor has a minimum of 9A; the contacts of the contactor usually have three pairs of main contacts (the main contacts are often open contacts) and the other pairs of auxiliary contacts, and the contacts of the relay are generally not divided into the main auxiliary; Electrical contacts are sometimes set in pairs, that is, often open contacts and often closed contacts together, and the contactor is not set; for specific requirements, the relay will be combined with other devices to design time relays, counters, pressure relays and so on, with additional functions, and the contactor is generally not.