SSR
Solid-state relay
A solid-state relay switches an output through semiconductor circuitry in response to a control input.
Schematic
Symbols · OPTO-TR
Phototransistor optocoupler
An optical isolation component using an input light emitter and a transistor output on the isolated side.
Schematic · OPTO-TR
What it represents
An optical isolation component using an input light emitter and a transistor output on the isolated side.
On a schematic, identify the emitter current circuit, output collector/emitter and isolation boundary and trace the isolated input status or feedback path. Keep the component tag and signal/reference names consistent across the control drawing, terminal schedule and device documentation.
Optical isolation separates electrical domains; the current-transfer behaviour and output polarity are component-specific.
The preview is an independently drawn educational functional reference. Add the selected component’s actual power pins, terminal numbers, timing or analogue reference details when producing a construction drawing.
How to read it
- Identify the emitter current circuit, output collector/emitter and isolation boundary.
- Trace the isolated input status or feedback path.
Information to show or reference
- Label the emitter current circuit, output collector/emitter and isolation boundary.
- Cross-reference the isolated input status or feedback path.
- Add the selected device or circuit documentation revision, power/reference connections and project signal convention.
A distinction that matters
Optical isolation separates electrical domains; the current-transfer behaviour and output polarity are component-specific.
Sources you can follow
These public references support the explanation and provide further detail. Their graphics and downloadable files remain with their publishers.
Optocoupler output-family reference
Public primary manufacturer documentation establishes the component function or circuit/topology relationship. Preview geometry and drafting explanations are independently authored.
About this graphic
This illustration was authored independently by Elora Grid to explain the concept. It is not reproduced from a customer drawing, an official standard graphic or a manufacturer CAD file. Its correspondence to an exact IEC or IEEE symbol identifier has not been certified.
SVG and DXF downloads contain this original artwork. DXF uses unscaled drawing units; a GA envelope supplies no product dimensions, clearances or fabrication information. Original artwork is available under CC BY 4.0. Third-party references retain their own terms.
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