{"schemaVersion":1,"slug":"single-phase-autotransformer","name":"Single-phase autotransformer","kind":"symbol","abbreviation":"AT 1PH","aliases":["HXF1P1AUTO","VXF1P1AUTO"],"category":"power-distribution","drawingTypes":["SLD","Schematic"],"referenceFamilies":["IEC","Manufacturer"],"summary":"A single-phase autotransformer uses a winding portion shared electrically by its input and output circuits.","description":["A single-phase autotransformer uses a winding portion shared electrically by its input and output circuits. Its drawing must make the common connection clear because it does not provide winding separation like a two-winding transformer."],"readingNotes":["Trace the common winding terminal and identify the supply and load tap positions.","The preview is an original explanation of this function. Match the actual drawing convention to its legend and the selected equipment documentation."],"drawingChecklist":["State input and output voltages","Show common winding connection","Reference tap and rating data"],"distinction":"An autotransformer is not an isolating two-winding transformer.","facts":[{"label":"Drawing role","value":"Winding connection"},{"label":"Representation scope","value":"Functional concept; not an official standard graphic or a product footprint"},{"label":"Public vendor block reference","value":"HXF1P1AUTO, VXF1P1AUTO (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":"autodesk-transformers","relevance":"Public documentation of this equipment function or named vendor variant; the illustration is independently authored and is not the source graphic."}],"related":["power-transformer","voltage-transformer"],"artwork":"edu-single-phase-autotransformer","publishedOn":"2026-10-13","updatedOn":"2026-10-13","provenance":"independent-public-research","url":"https://eloragrid.ai/symbols/single-phase-autotransformer","illustration":{"url":"https://eloragrid.ai/library/illustrations/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":"autodesk-transformers","title":"Power, potential and autotransformer symbols","publisher":"Autodesk","url":"https://help.autodesk.com/cloudhelp/2021/ENU/AutoCAD-Electrical/files/GUID-C1FE1690-DBF4-4F69-85C4-28E41F0A6392.htm","type":"cad-reference","scope":"Power transformers, voltage transformers, winding counts, screens and autotransformers.","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."}]}