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An LED facing a phototransistor inside one box.
Also known as: Opto-isolator symbol, Photocoupler
An optocoupler passes a signal across a gap using light, so that two circuits can communicate without sharing a connection. Its symbol shows a light-emitting diode facing a light-sensitive device inside a single outline, and the outline is the isolation barrier.
Denotes a device passing a signal optically between two electrically isolated circuits.
Contexts: Technical drawing, Electrical equipment
Draws the isolation as an enclosing outline separating an emitter from a detector, which is the safety-relevant part of the symbol rather than decoration.
Contexts: Technical drawing, Electrical equipment
A rectangle containing a diode triangle facing a transistor, with two arrows between them pointing from one to the other.