三菱 交流控制型电磁接触器；S-T35 AC100V 2A2B C
接触器是一种用来接通或断开带负载的交直流主电路或大容量控制电路的自动化切换器，主要控制对象是电动机，此外也用于其他电力负载，如电热器，电焊机，照明设备，接触器不仅能接通和切断电路，而且还具有低电压释放保护作用/。接触器控制容量大。适用于频繁操作和远距离控制。是自动控制系统中的重要元件之一。
A contactor is an automatic switch used to connect or disconnect the loaded AC / DC main circuit or large capacity control circuit. The main control object is the motor, and it is also used for other electric loads, such as electric heater, electric welding machine, lighting equipment, and the contactor can not only connect and cut off the circuit, but also have low voltage release. Put the protective effect. The contactor has a large control capacity. It is suitable for frequent operation and long distance control. It is one of the most important components in the automatic control system.
继电器他的动做原理和接触器是一样的,但是它的触头承载电流的能力要比接触器差,一般不会超过10A的.所以它不合适控制大容量的电路的,适合加装在控制电路的中,在控制电路中得到广泛的应用
The relay has the same dynamic principle as the contactor, but its contact head is less capable of carrying the current than the contactor, generally not more than 10A. So it is not suitable for controlling the large capacity circuit, suitable for loading in the control circuit and widely used in the control circuit.
继电器的选用：
Selection of relay:
1.先了解必要的条件：1控制电路的电源电压，能提供的大电流；2被控制电路中的电压和电流；3被控电路需要几组、什么形式的触点。选用继电器时，一般控制电路的电源电压可作为选用的依据。控制电路应能给继电器提供足够的工作电流，否则继电器吸合是不稳定的。
1. first understand the necessary conditions: (1) the power supply voltage of the control circuit, the maximum current that can be provided; the voltage and current in the controlled circuit; (3) the controlled circuit needs several sets of contact points. When selecting relay, the power and voltage of general control circuit can be chosen as the basis. The control circuit should provide enough working current for the relay, otherwise the relay will be unstable.