Three forms of relay contacts

Relays have a wide variety of uses. According to the different input signals can be divided into voltage relays, current relays, speed relays, time relays, pressure relays. According to the working principle can be divided into electromagnetic relays, electric relays, inductive relays, electronic relays.

There are three basic forms of relay contacts. Learn about them together:

1. The two contacts are disconnected when the movable type (normally open) (H type) coil is not energized. After the energization, the two contacts are closed. This is the Chinese phonetic alphabet H.

2. The two contacts are closed when the disconnected (normally closed) (D type) coil is not energized, and the two contacts are opened after energization. It is represented by the phonetic prefix D of the hyphenation.

3. Conversion type (Z type) This is a contact type. This contact group has a total of three contacts, ie, the middle is a moving contact and each of the upper and lower stationary contacts. When the coil is not energized, the movable contact is disconnected from one of the stationary contacts and the other is closed. After the coil is energized, the movable contact is moved, so that the original disconnection is closed, and the original closed state becomes an open state, and the conversion is achieved. purpose. Such contact groups are called transition contacts. The pinyin prefix z is used to indicate the word.