1. Expand the control range: For example, when the control signal of a multi-contact relay reaches a certain value, multiple circuits can be switched, disconnected, and connected at the same time according to different forms of contact groups.

2. Amplification: For example, sensitive relays, intermediate relays, etc., with a very small control quantity, can control a circuit with a large power.

3. Comprehensive signal: For example, when multiple control signals are input into a multi-winding relay in a prescribed form, they will be relatively integrated to achieve a predetermined control effect.

4. Automatic, remote control, and monitoring: For example, the relay on the automatic device and other electrical appliances can form a program control circuit to realize automatic operation.

The general circuit is often divided into two parts: the main circuit and the control circuit. The relay is mainly used for the control circuit, and the contactor is mainly used for the main circuit; through the relay, the function of controlling another or several signals with one control signal can be realized to complete the start and stop. , Linkage and other control, the main control object is the contactor; the contactor of the contactor is relatively large, and the carrying capacity is strong. Through it, the control from weak to strong current is realized, and the control object is electrical appliances.

1. Replace small contactors

The contacts of the intermediate relay have 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 gates and some small household appliances. The advantage of this is that it can not only achieve the purpose of control, but also save space and make the control part of the electrical appliance more delicate.

2. Increase the number of contacts

In the circuit control system, the contact of a contactor needs to control multiple contactors or other components. It should not be connected to other forms casually, because this is not conducive to maintenance. Instead, adding an intermediate relay to the line will not change the control form. , And easy to maintain.

3. Increase contact capacity

Although the contact capacity of the intermediate relay is not very large, it also has a certain load capacity, and the current required for its drive is very small, so the intermediate relay can be used to expand the contact capacity.

4. Convert contact type

In industrial control circuits, such a situation often occurs. The control requires the use of the normally closed contacts of the contactor to achieve the control purpose, but the normally closed contacts of the contactor itself have been used up and the control task cannot be completed. At this time, an intermediate relay can be connected in parallel 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 to achieve the required control purpose.

5. Convert contact type

In some control circuits, intermediate relays are often used for the on and off of some electrical components, which are controlled by the opening and closing of their contacts, such as the automatic degaussing circuit commonly seen in color TVs or displays. The triode controls the on and off of the intermediate relay to control the degaussing coil. The role of on-off.

6. Conversion voltage

In the industrial control circuit, the voltage in the control circuit is DC24V. The contactor KM2 needs to control the on and off of the solenoid valve KT, and the solenoid valve coil voltage is AC220V. It is not impossible in principle to connect the coil of the solenoid valve directly with the contact of the contactor, but consider the maintenance habits and safety issues. An intermediate relay should be installed in another place to control the solenoid valve through the intermediate relay. In this way, DC and AC, high voltage and low voltage can be separated. It is convenient for future maintenance and is conducive to safe use.

7. Eliminate interference in the circuit

In industrial control or computer control circuits, although there are various interference suppression measures, the interference phenomenon still exists more or less. The general induction current will not cause the action of the intermediate relay. Only when the button in the original circuit is operated will the intermediate relay be activated, giving the PLC a normal input signal, thus achieving the purpose of eliminating interference.

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