{"schemaVersion":1,"slug":"silicon-controlled-rectifier","name":"Silicon-controlled rectifier","kind":"symbol","abbreviation":"SCR","aliases":["HDI1V4","VDI1V4","thyristor"],"category":"control-circuits","drawingTypes":["Schematic"],"referenceFamilies":["IEC","Manufacturer"],"summary":"An SCR is a thyristor with a gate-controlled triggering function in its documented circuit.","description":["An SCR is a thyristor with a gate-controlled triggering function in its documented circuit. Anode, cathode and gate connections must be distinguished to understand the control path."],"readingNotes":["Read turn-on and current-interruption behaviour from the chosen circuit and component.","The preview is an original explanation of this function. Match the actual drawing convention to its legend and the selected equipment documentation."],"drawingChecklist":["Label gate/anode/cathode","Reference gate drive","State voltage/current ratings"],"distinction":"An SCR is not the same as a bidirectional TRIAC.","facts":[{"label":"Drawing role","value":"Semiconductor function"},{"label":"Representation scope","value":"Functional concept; not an official standard graphic or a product footprint"},{"label":"Public vendor block reference","value":"HDI1V4, VDI1V4 (Autodesk identifiers; not IEC symbol numbers)"},{"label":"Identifier status","value":"The short label is a functional lookup label, not an assigned IEC or IEEE symbol number. Any separately listed Autodesk code is a verified vendor block name."}],"references":[{"sourceId":"pub-symbol-semiconductors","relevance":"Public documentation of this equipment function or named vendor variant; the illustration is independently authored and is not the source graphic."}],"related":["resistor","power-converter"],"artwork":"edu-silicon-controlled-rectifier","publishedOn":"2026-10-13","updatedOn":"2026-10-13","provenance":"independent-public-research","url":"https://eloragrid.ai/symbols/silicon-controlled-rectifier","illustration":{"url":"https://eloragrid.ai/library/illustrations/silicon-controlled-rectifier.svg","scope":"Original educational concept; not an official standard graphic or product footprint","license":"https://creativecommons.org/licenses/by/4.0/"},"sources":[{"id":"pub-symbol-semiconductors","title":"AutoCAD Electrical: Semiconductor components","publisher":"Autodesk","url":"https://help.autodesk.com/cloudhelp/2021/ENU/AutoCAD-Electrical/files/GUID-AC954072-7314-4682-88AF-38160D61E9A2.htm","type":"cad-reference","scope":"Public vendor catalogue naming and functional variants. Vendor block names are not IEC identifiers. Linked for reference; no graphics or CAD files are redistributed.","checkedOn":"2026-10-13","reuse":"link-only","relevance":"Public documentation of this equipment function or named vendor variant; the illustration is independently authored and is not the source graphic."}]}