What is the function and wiring method of relay?

Relay is still very common in our life, but many people are still unfamiliar with it. They only know that this component exists, but they don't know what it is for. Then, the following small series will take you to understand the role of relays, what is the wiring method, and the precautions for relay purchase.

What is the function and wiring method of relay?

Expanding control range and the function of integrated signal: When the signal controlled by relay reaches a certain value, the control range can be expanded and multiple control signals can be used together. The wiring of each relay is different, such as a 3-pin relay. 1 port is connected to the load, port 2 is connected to the power supply, which is a male port, and the remaining port 3 is connected to the button.

Matters needing attention in relay procurement

1. When selecting a relay, you need to pay attention to the contact type and load. Because of the same type of relay, there are many contact methods, such as single contact, multi-group contact and so on. Therefore, when choosing a relay, we should pay attention to the contact type.

2. In the process of selecting relay, its rated current must be within the specified range. If the relay is a transistor, its rated current should be less than its output current.

3, the size of the relay is also a place to pay attention to in the purchase, because it has a very big relationship with the contact load, which has a great influence on its size. The relays we use are basically determined according to the requirements of the circuits used, so that there will be no abnormalities when using them.

4. When choosing a relay, pay attention to its coil power supply and voltage. For electromagnetic relay, it belongs to DC or AC, so it is rated working voltage. If it is an ordinary relay, it should be less than its working voltage.

Summary: All the above are about the function of relay, what is the connection mode, and the matters needing attention in selecting relay. I hope it will help everyone. For more information, please keep an eye on Qijia. com。