{"schemaVersion":1,"slug":"varistor","name":"Varistor","kind":"symbol","abbreviation":"VDR","aliases":["HVR1R3","VVR1R3"],"category":"control-circuits","drawingTypes":["SLD","Schematic"],"referenceFamilies":["IEC","Manufacturer"],"summary":"A varistor is a voltage-dependent resistive component used in a documented circuit, often for transient limiting.","description":["A varistor is a voltage-dependent resistive component used in a documented circuit, often for transient limiting. Its rating and protected connection are needed beyond the generic outline."],"readingNotes":["Check continuous-voltage rating separately from clamping-related data.","The preview is an original explanation of this function. Match the actual drawing convention to its legend and the selected equipment documentation."],"drawingChecklist":["Identify protected terminals","State selected voltage rating","Reference energy and surge data"],"distinction":"A varistor is nonlinear; a fixed resistor does not provide the same voltage-dependent function.","facts":[{"label":"Drawing role","value":"Passive circuit element"},{"label":"Representation scope","value":"Functional concept; not an official standard graphic or a product footprint"},{"label":"Public vendor block reference","value":"HVR1R3, VVR1R3 (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-resistors","relevance":"Public documentation of this equipment function or named vendor variant; the illustration is independently authored and is not the source graphic."}],"related":["resistor","capacitor"],"artwork":"edu-varistor","publishedOn":"2026-10-13","updatedOn":"2026-10-13","provenance":"independent-public-research","url":"https://eloragrid.ai/symbols/varistor","illustration":{"url":"https://eloragrid.ai/library/illustrations/varistor.svg","scope":"Original educational concept; not an official standard graphic or product footprint","license":"https://creativecommons.org/licenses/by/4.0/"},"sources":[{"id":"autodesk-resistors","title":"Resistors and heater-element symbols","publisher":"Autodesk","url":"https://help.autodesk.com/cloudhelp/2021/ENU/AutoCAD-Electrical/files/GUID-1D071951-D38E-4B15-8B9E-C30ECBD55C19.htm","type":"cad-reference","scope":"Fixed and variable resistive components, shunts and heater elements.","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."}]}