Does the relay work make a sound?


Does the relay work make a sound? The answer is yes. Th […]

Does the relay work make a sound? The answer is yes. The role of the relay is very wide, and there are many types of relays. We can see the relay in circuit control. The role of the relay is to use it as a switch. Pulling in will make a sound, but only mechanical relays will make a sound. Let's take a look at the working principle of the relay to understand the reason for the sound.


Working principle of mechanical relay

The relay is generally composed of iron core, coil, armature, contact reed, etc. As long as a certain voltage is applied to both ends of the coil, a certain current will flow through the coil, thereby generating an electromagnetic effect. The moving contact and the static contact (normally open contact) are attracted. When the coil is de-energized, the electromagnetic suction will also disappear, and the armature will return to the original position under the reaction force of the spring, so that the moving contact and the original static contact (normally closed contact) are released. This pulls in and releases, thus achieving the purpose of turning on and off in the circuit. So when the relay continues to pull in, it will make a sound.



The solution of the sound when the relay works:

The sound of the relay will generally be produced when the mechanical relay is used. Then the only way to solve the problem of the sound of the relay is to replace the relay and replace the mechanical relay with a solid-state relay. Because the solid-state relay is the on and off of the semiconductor element, there is no sound.

The relay includes a relay that uses an electromagnet and a relay that uses a semiconductor. However, when a relay that uses an electromagnet operates and resets, parts (iron pieces, movable contacts, fixed contacts, etc.) collide and make a sound. The sound makes it easy to confirm the action, but it is not popular in automatic machines such as air conditioners and automobiles.