SCR
Silicon-controlled rectifier
An SCR is a thyristor with a gate-controlled triggering function in its documented circuit.
Schematic
IEEE / ANSI · SCR
ANSI/IEEE silicon-controlled rectifier symbol
IEEE-oriented graphical reference for silicon-controlled rectifier, with public vendor evidence and drawing-reading notes.
IEEE / ANSI · Autodesk IEEE-oriented Semiconductor Components functional form
Autodesk explicitly publishes this block under IEEE Symbol Preview. The counterpart is the matching functional concept; no equivalence of every detailed standard graphic is asserted.
Shown as an independently authored educational illustration. Use the cited publication and drawing legend to verify the required drafting form.
Schematic · SCR
What it represents
The SCR form identifies a thyristor power path with a separate gate trigger connection. Following anode, cathode and gate independently explains the difference between the controlled power circuit and its drive circuit.
This is a convention-specific lookup based on the publisher's IEEE-labelled preview. The geometry here is independently drawn to explain the connection or operation; it is not a certified reproduction of the standard graphic.
How to read it
- Locate the gate reference before interpreting the trigger supply.
- Read the selected library and the project legend together. A vendor block identifier is meaningful within its named library and is not a universal standard-symbol code.
Information to show or reference
- Label anode/cathode/gate
- Reference gate drive
- State power-circuit rating
A distinction that matters
An SCR is different from a bidirectional TRIAC, and a gate lead is not an additional load terminal.
Sources you can follow
These public references support the explanation and provide further detail. Their graphics and downloadable files remain with their publishers.
Autodesk IEEE Symbol Preview — Semiconductor Components
Exact public IEEE-oriented category page verifying the component name and vendor block identifier.
IEEE/ANSI 315-1975: graphic symbols for electrical and electronics diagrams
Graphic-symbol standards context and official status; not a source of reproduced artwork.
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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