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Relays are electromagnetic switching components that use small‑control current to switch high‑power circuits. A typical relay consists of a coil and mechanical contact switches.
When current flows through the coil, magnetic force pulls contacts open or closed to turn heavy‑load circuits on or off. They isolate low‑voltage control parts from high‑power circuits.
Key specifications include coil voltage, contact current rating and switching lifespan. Solid‑state relays without moving parts offer faster operation compared to mechanical versions.
Relays are widely adopted in home appliances, automotive systems and industrial controls. They protect delicate control chips and safely manage high‑current equipment.
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