What are the contact forms of the relay?

What are the contact forms of the relay?

A relay is an electrical control device. It is an electrical appliance that causes the controlled quantity to undergo a predetermined step change in the electrical output circuit when the input quantity (excitation quantity) changes to the specified requirements. latching relay manufacturers It has an interactive relationship between the control system (also called the input loop) and the controlled system (also called the output loop). Usually used in automated control circuits, it is actually an "automatic switch" that uses a small current to control the operation of a large current. Therefore, it plays the role of automatic adjustment, safety protection, and conversion circuit in the circuit.　　

There are three basic forms of relay contacts: 　　

1. The two contacts are disconnected when the moving-on (normally open) (H-type) coil is not energized, and the two contacts are closed after energization. It is represented by the pinyin prefix "H" of the ligature.　　

2. The two contacts of the movable-break (normally closed) (D type) coil are closed when the coil is not energized, and the two contacts are disconnected after energization. It is indicated by the pinyin prefix "D" of hyphenation.　　

3. Conversion type (Z type) This is a contact group type. This kind of contact group has three contacts in total, that is, the middle is a moving contact, and the upper and lower are static contacts. When the coil is not energized, the moving contact and one of the static contacts are disconnected and the other is closed. After the coil is energized, the moving contact moves to make the original open to be closed, and the original closed to the open state to achieve the conversion. purpose. Such contact groups are called changeover contacts. It is indicated by the pinyin prefix "z" of the word "turn".