ACE 6347-12V 8 Channel Relay Module

A relay generally consists of an iron core, coil, armature, contact, etc. As long as a certain voltage is applied to both ends of the coil, a certain amount of current will flow through the coil, generating electromagnetic effects. The armature will overcome the pulling force of the return spring and attract to the iron core under the attraction of electromagnetic force, thereby driving the moving contact of the armature to engage with the static contact (normally open contact). When the coil is powered off, the electromagnetic attraction also disappears, and the armature will return to its original position under the reaction force of the spring, causing the moving contact to engage with the original static contact (normally closed contact). This suction and release achieves the purpose of conduction and disconnection in the circuit. For the “normally open and normally closed” contacts of relays, they can be distinguished as follows: the static contacts that are in the disconnected state when the relay coil is not energized are called “normally open contacts”; The static contact in the on state is called a “normally closed contact”.

A relay is equivalent to an electronic switch and can replace a mechanical switch. It itself does not output current and cannot be used as a power source!