The four major functions of electromagnetic relay modules

The four major functions of electromagnetic relay modules
Electromagnetic relays generally consist of an iron core, coil, magnet, contact spring, etc. When a certain voltage is applied to both ends of the relay module coil, a certain current will flow through the coil, generating electromagnetic effects. Under the attraction of electromagnetic force, the pulling force around the return spring is attracted to the iron core, causing the moving contact (normally open contact) of the magnet to be attracted to the magnet. Once the coil loses power, the electromagnetic attraction also disappears, and the armature will return to its original position in the reaction force of the spring, releasing the moving contact from the original static contact (normally closed contact). In this way, suction and release are achieved to achieve the purpose of conduction and disconnection in the circuit. For the normally open and normally closed contacts of a relay, the static contacts that are in the disconnected state when the relay coil is not energized can be called normally open contacts; The static contact in the connected state is called a "normally closed contact". Normally, relays are divided into low-voltage control circuits and high-voltage working circuits.
The function of the relay is as follows:
*Expand control range:
For example, after the control signal of the multi contact relay module reaches a certain value, it can be switched on, off, and on simultaneously according to different forms of contact relay module point groups.
·Zoom in:
For example, sensitive relays, intermediate relays, etc. can control very large circuits with a very small amount of control.
-Merge signals:
For example, when multiple control signals are input into a multi winding relay in a specified form for comparison and synthesis, the predetermined control effect can be achieved.
Automation, remote control, and monitoring:
For example, relays and other electrical appliances on automatic devices can form a program control line to achieve automated operations.