{"schemaVersion":1,"slug":"ansi-single-phase-autotransformer","name":"ANSI/IEEE single-phase autotransformer symbol","kind":"symbol","abbreviation":"AT 1PH","aliases":["IEEE single-phase autotransformer symbol","ANSI single-phase autotransformer symbol","HXF1P1AUTO"],"category":"power-distribution","drawingTypes":["SLD","Schematic"],"referenceFamilies":["IEEE / ANSI","Manufacturer"],"summary":"IEEE-oriented graphical reference for single-phase autotransformer, with public vendor evidence and drawing-reading notes.","description":["The single-phase autotransformer form identifies a shared winding path between input and output. Following that common electrical path explains why this device differs from two electrically separate windings even when the voltage transformation purpose is similar.","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."],"readingNotes":["Locate the common winding terminal and the load tap.","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."],"drawingChecklist":["State input/output voltages","Show common connection","Reference tap ratings"],"distinction":"An autotransformer does not provide the same winding separation as a two-winding transformer.","facts":[{"label":"Convention evidence","value":"Autodesk IEEE Symbol Preview — Transformers"},{"label":"Public vendor block name","value":"HXF1P1AUTO (Autodesk identifier; not an IEEE symbol number)"},{"label":"Standards context","value":"IEEE/ANSI 315-1975 covers diagram graphics. IEEE lists this edition as Inactive-Reserved."},{"label":"Artwork scope","value":"Original functional illustration; exact standard glyph and compliance are not certified"}],"references":[{"sourceId":"ansi-autodesk-68d02867-7a98-47d1-a83f-dbad1ddb616f","relevance":"Exact public IEEE-oriented category page verifying the component name and vendor block identifier."},{"sourceId":"ieee-315","relevance":"Graphic-symbol standards context and official status; not a source of reproduced artwork."}],"related":["single-phase-autotransformer","power-transformer","voltage-transformer"],"artwork":"edu-ansi-single-phase-autotransformer","publishedOn":"2026-10-14","updatedOn":"2026-10-14","provenance":"independent-public-research","symbolVariant":{"convention":"IEEE / ANSI","form":"Autodesk IEEE-oriented Transformers functional form","counterpart":"single-phase-autotransformer","reference":"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."},"url":"https://eloragrid.ai/symbols/ansi-single-phase-autotransformer","illustration":{"url":"https://eloragrid.ai/library/illustrations/ansi-single-phase-autotransformer.svg","scope":"Original educational concept; not an official standard graphic or product footprint","license":"https://creativecommons.org/licenses/by/4.0/"},"sources":[{"id":"ansi-autodesk-68d02867-7a98-47d1-a83f-dbad1ddb616f","title":"Autodesk IEEE Symbol Preview — Transformers","publisher":"Autodesk","url":"https://help.autodesk.com/cloudhelp/2021/ENU/AutoCAD-Electrical/files/GUID-68D02867-7A98-47D1-A83F-DBAD1DDB616F.htm","type":"cad-reference","scope":"Verified public IEEE-oriented vendor catalogue. Block names identify vendor symbols, not IEEE standard symbol numbers. Linked only; graphics and CAD files are not redistributed. IEEE/ANSI 315-1975 is a historical graphics reference with Inactive-Reserved status; this page does not certify current standards compliance.","checkedOn":"2026-10-14","reuse":"link-only","relevance":"Exact public IEEE-oriented category page verifying the component name and vendor block identifier."},{"id":"ieee-315","title":"IEEE/ANSI 315-1975: graphic symbols for electrical and electronics diagrams","publisher":"IEEE Standards Association","url":"https://standards.ieee.org/ieee/315/515/","type":"standard","scope":"Graphic symbols and designation letters. IEEE lists this edition as Inactive-Reserved; it is a historical reference, not a claim of current compliance.","checkedOn":"2026-10-13","reuse":"link-only","relevance":"Graphic-symbol standards context and official status; not a source of reproduced artwork."}]}