Relay is an electrical control device that uses the principle of electromagnetic induction to switch circuits on and off. It contains an electromagnet and a set of contacts. When the electromagnet is energized by current, it produces a magnetic field that attracts or repels the contacts, thereby controlling the circuit opening and closing. Relays are widely used in various electrical control fields, such as home appliances, industrial automation, traffic lights, power systems, etc. Relays have advantages such as large control current, good isolation, and high reliability, and can realize various circuit control functions such as time delay, interlocking, and timing control. At the same time, relays can also expand the control quantity of circuits and realize hierarchical control of circuits.
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