{"schemaVersion":1,"slug":"maintained-normally-closed-pushbutton","name":"Maintained normally-closed pushbutton","kind":"symbol","abbreviation":"PB NC HOLD","aliases":["HPB12S76","VPB12S76"],"category":"control-circuits","drawingTypes":["Schematic"],"referenceFamilies":["IEC","Manufacturer"],"summary":"A maintained NC pushbutton retains its actuated open state until the documented return action.","description":["A maintained NC pushbutton retains its actuated open state until the documented return action. This affects permissive and stopping circuits that depend on contact continuity."],"readingNotes":["Determine how the operator returns to the reference position.","The preview is an original explanation of this function. Match the actual drawing convention to its legend and the selected equipment documentation."],"drawingChecklist":["Label retained state","Show contact terminal numbers","Reference return mechanism"],"distinction":"Maintained NC operation does not alone establish an emergency-stop safety function.","facts":[{"label":"Drawing role","value":"Manual operation"},{"label":"Representation scope","value":"Functional concept; not an official standard graphic or a product footprint"},{"label":"Public vendor block reference","value":"HPB12S76, VPB12S76 (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-illuminated-pushbuttons","relevance":"Public documentation of this equipment function or named vendor variant; the illustration is independently authored and is not the source graphic."}],"related":["pushbutton-no","pushbutton-nc"],"artwork":"edu-maintained-normally-closed-pushbutton","publishedOn":"2026-10-13","updatedOn":"2026-10-13","provenance":"independent-public-research","url":"https://eloragrid.ai/symbols/maintained-normally-closed-pushbutton","illustration":{"url":"https://eloragrid.ai/library/illustrations/maintained-normally-closed-pushbutton.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-illuminated-pushbuttons","title":"AutoCAD Electrical: Illuminated push buttons","publisher":"Autodesk","url":"https://help.autodesk.com/cloudhelp/2021/ENU/AutoCAD-Electrical/files/GUID-7B13B543-97A4-4A7E-8D08-49386A153A33.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."}]}