Intermediate relay is a relay, which is composed of fixed iron core, moving iron core, spring, moving contact, static contact, coil, terminal and shell. When the coil is electrified, the moving iron core acts to pull in under the action of electromagnetic force, and the moving contact acts to separate the normally closed contact and close the normally open contact; When the coil is powered off, the moving iron core drives the moving contact to reset under the action of the spring.

在工业控制线路和现在的家用电器控制线路中，常常会有中间继电器存在，对于不同的控制线路，中间继电器的作用有所不同，其在线路中的作用常见的有以下几种。

In the industrial control circuit and the current home appliances control circuit, there are often intermediate relays. For different control circuits, the role of intermediate relays is different. The common roles of intermediate relays in the circuit are as follows.

1、作用之一--代替小型接触器

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

中间继电器的触点具有一定的带负荷能力，当负载容量比较小时，可以用来替代小型接触器使用，比如电动卷闸门和一些小家电的控制。这样不仅可以起到控制的目的，而且可以节省空间，使电器的控制部分做得比较精致。

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--增加接点数量

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

在电路控制系统中，线路中增加一个中间继电器，不仅不会改变控制形式、增加接点数量，而且便于维修。

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--增加接点容量

3. The third function is to increase the contact capacity

中间继电器的接点容量虽然不是很大，但也具有一定的带负载能力，同时其驱动所需要的电流又很小，因此可以用中间继电器来扩大接点容量。而在控制线路中使用中间继电器，通过中间继电器来控制其他负载，达到扩大控制容量的目的。

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.

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