What is the difference between the intermediate relay and the AC contactor
That popular point is
The intermediate relay controls the small flow of the AC contactor to control the flow
Commonly used control electrical - AC contactor: In the electrical control circuit, divided into control circuit and the main circuit. AC contactors are the main circuits that are often used to turn on or off the motor or other equipment. Every hour can open and close hundreds of times. In the circuit, often used in conjunction with the button.
Reference: International Electrical Network
It is used to pass the intermediate signal in the control circuit. The structure and principle of the intermediate relay are basically the same as those of the AC contactor. The main difference from the contactor is that the main contact of the contactor can pass through the high current and the contact of the intermediate relay can only pass through the small current. Therefore, it can only be used in the control circuit. It is generally no main contact, because the overload capacity is relatively small. So it is all with auxiliary contacts, the number of more. The new national standard for the definition of intermediate relay is K, the old national standard is KA. Usually DC power supply. A few use AC power.
