1. One of the functions -- to replace the small contactor

中間繼電器的觸點具有一定的帶負荷能力，當負載容量比較小時，可以用來替代小型接觸器使用，比如電動卷閘門和一些小家電的控制。這樣不僅可以起到控制的目的，而且可以節省空間，使電器的控制部分做得比較精致。

The contact of the intermediate relay has a certain load capacity. When the load capacity is relatively small, it can be used to replace small contactors, such as the control of electric rolling gate and some small household appliances. This not only can play the purpose of control, but also can save space, so that the control part of electrical appliances do more delicate.

2、作用之二--增加接點數量

2. The second function is to increase the number of contacts

在電路控制系統中，線路中增加一個中間繼電器，不僅不會改變控制形式、增加接點數量，而且便于維修。

In the circuit control system, adding an intermediate relay in the circuit not only does not change the control form and increase the number of contacts, but also is convenient for maintenance.

3、作用之三--增加接點容量

3. The third function is to increase the contact capacity

中間繼電器的接點容量雖然不是很大，但也具有一定的帶負載能力，同時其驅動所需要的電流又很小，因此可以用中間繼電器來擴大接點容量。而在控制線路中使用中間繼電器，通過中間繼電器來控制其他負載，達到擴大控制容量的目的。

Although the contact capacity of the intermediate relay is not very large, it also has a certain load capacity. At the same time, the current required for its drive is very small, so the intermediate relay can be used to expand the contact capacity. The intermediate relay is used in the control circuit to control other loads, so as to expand the control capacity.

4、作用之四--轉換接點類型

4. Function 4 -- type of transfer contact

在工業控制線路中，可以將一個中間繼電器與原來的接觸器線圈并聯，用中間繼電器的常閉接點去控制相應的元件，轉換一下接點類型，可以實現需要使用接觸器的常閉接點才能達到控制目的。

In the industrial control circuit, an intermediate relay can be paralleled with the original contactor coil, and the normally closed contact of the intermediate relay can be used to control the corresponding components, and the contact type can be changed, so that the normally closed contact of the contactor can be used to achieve the control purpose.

5、作用之五--用作開關

5. Function 5: used as a switch

在一些控制線路中，一些電器元件的通斷常常使用中間繼電器，用其接點的開閉來控制。如彩電或顯示器中常見的自動消磁電路，三極管控制中間繼電器的通斷，從而達到控制消磁線圈通斷的作用。

In some control circuits, the on-off of some electrical components often uses the intermediate relay, which is controlled by the opening and closing of its contact. For example, in the common automatic degaussing circuit of color TV or display, the triode controls the on-off of intermediate relay, so as to control the on-off of degaussing coil.

6、作用之六--轉換電壓

6. Function 6 -- switching voltage

在工業控制線路控制線路中電壓是DC24V，而電磁閥的線圈電壓是AC220V，安裝一個中間繼電器，可以將直流與交流、高壓與低壓分開，便于以后的維修并有利于安全使用。

In the industrial control circuit, the voltage of the control circuit is DC24 V, while the coil voltage of the solenoid valve is AC220 v. installing an intermediate relay can separate DC from AC, high voltage from low voltage, which is convenient for future maintenance and safe use.

7、作用之七--消除電路中的干擾

7. The seventh function is to eliminate the interference in the circuit

在工業控制或計算機控制線路中，雖然有各種各樣的干擾抑制措施，但干擾現象還是或多或少地存在著，在內部加入一個中間繼電器，可以達到了消除干擾的目的。

In the industrial control or computer control circuit, although there are various interference suppression measures, the interference phenomenon still exists more or less. Adding an intermediate relay inside can achieve the purpose of eliminating interference.