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I’m looking for the name of the component that act like a relay but instead of using a coil to generate a magnetic field that moves the relay « arm » it uses a LED and a photosensor.

It allows to isolate a high voltage of a circuit from a low voltage.

Thanks a lot!

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  • \$\begingroup\$ I think you're looking for an opto-isolator (aka optocoupler). \$\endgroup\$
    – Christopher Bennett
    Commented Jan 20, 2021 at 16:52

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Optocoupler, optoisolator, solid state relay, opto-triac.

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  • \$\begingroup\$ Optocoupler! That’s what I was looking for ! Thanks a lot!! \$\endgroup\$
    – Dominique
    Commented Jan 20, 2021 at 17:08
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Solid-state relay is the term you are looking for for high power devices.

Opto-isolator for small currents.

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    \$\begingroup\$ A solid-state relay is just an optocoupler with aspirations. \$\endgroup\$
    – Hearth
    Commented Jan 20, 2021 at 16:55

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