Usually, the same text symbol is marked on the side of the same relay and the coil, and the contact group is numbered to show the difference. So, do you know which types of relays are in contact? Let's take a look at it! There are three basic forms of relay contacts:
1. When the moving type (normally open) (H type) coil is not energized, the two contacts are disconnected. After energization, the two contacts are closed. It is represented by the pinyin head "H" of the word.
2. When the break type (normally closed) (D type) coil is not energized, the two contacts are closed, and the two contacts are disconnected after power-on. It is represented by the pinyin head "D" of the hyphenation.
3. Conversion type (Z type) This is the contact type. This contact group has three contacts, that is, the middle is a moving contact, and one static contact is provided.
When the coil is not energized, the movable contact and one of the static contacts are opened and the other is closed. After the coil is energized, the movable contact moves, so that the original disconnection is closed, and the original closed state is turned off, and the conversion is achieved. purpose. Such a set of contacts is called a changeover contact. It is represented by the pinyin head "z" of the "turn" character. The above three are the basic forms of relay contact points!