Relays are available in communications equipment, automation, home appliances, automotive electronics, and other places where circuit conversion is required.
Since the relay is composed of two parts: the coil and the contact group, the graphical symbol of the relay in the circuit diagram also includes two parts: one long square indicates the coil; and one set of contact symbols indicates the contact combination. When the contactless circuit is relatively simple, the contact group is often drawn directly on one side of the coil frame. This drawing is called a centralized representation.
The application fields of relays are as follows:
The field of relay application is very wide, and its environmental conditions and technical requirements are very different. Is the same use in different fields of application, the requirements are not the same