Electric sign and contact form of relay (Dieselpartsworld) 2016-01-19     

Electric sign and contact form of relay

Relay coil in the circuit with a rectangular frame symbol, the relay has two coils, draw two parallel rectangular frame. Letter "J" to the relay on the side of a rectangular box or a square box". Relay contacts have two kinds of methods: one is to draw directly on the side of the rectangular box, this representation is more intuitive. Another is connected to the circuit, putting all the contacts were painted to the respective control circuit, usually on the side of the same relay contacts and coils are marked on the text symbols and contact group on the number, to show the difference. Relay contacts have three basic forms:

1 movable type (type H) coil is not energized when the two contacts are disconnected, power, the two contacts on the closure. The word phonetic prefix "H" said.

2 dynamic fault type (D type) coil is not energized when the two contacts are closed, the power of the two contacts on off. With the hyphenation of phonetic prefix "D" said. within

3 conversion type (Z type) this is the contact type. A total of three contacts of the contact group, namely the moving contact, the upper and lower each of a static contact. When the coil is not energized, the movable contact and one of the static contacts are disconnected and the other is closed. After the coil is electrified, the moving contact is moved, and the disconnection is closed, the closed form is broken, and the conversion is achieved. The contact group is called a switching contact. With the "turn" the word phonetic prefix "Z" said.