The relay is an electromagnet whose electromagnet core attracts the armature with the moving contact and cooperates with the reset tension spring to move between one or an array of normally open and normally closed static contacts. All the uses of a relay come down to one point, one or a group of electrical switches that are controlled by weak current.
It has a control system and a controlled system, usually used in automated control circuits, which usually use small currents to control large currents or high voltages. The principle of the Power Relay is the same as above, but the corresponding contacts, structure, winding, opening distance and so on.
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