Relays are mechanic switches that use a voltage and a certain amount of current to switch them. They typically have a double pole double throw mechanical switch that is electrically separate from an inductor used to move a magnet between switch positions.
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Just a schematic of the relay component for this page. I’m not sure that there is a standard schematic diagram for relays, so I made this one based on some similar ones I seen. The schematics for relays that I come across tend to be drawn in a way that fits the rest of the circuit well.
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