How a Small Signal Controls Big Power — What a Relay Really Does A relay is not just a switch — it’s a power translator. In this clear, practical explanation by Diopter Technologies Limited, we break down what a relay is, how a low-power control signal safely switches high-power loads, and why relays are still everywhere despite solid-state alternatives. You’ll see what happens when the coil energizes, how magnetic force moves contacts, and why electrical isolation makes relays critical for auto
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How a Small Signal Controls Big Power — What a Relay Really Doe…
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