{"schemaVersion":1,"slug":"ansi-pushbutton-nc","name":"ANSI/IEEE normally closed pushbutton symbol","kind":"symbol","abbreviation":"PB NC","aliases":["IEEE normally closed pushbutton symbol","ANSI normally closed pushbutton symbol","HPB12"],"category":"control-circuits","drawingTypes":["Schematic"],"referenceFamilies":["IEEE / ANSI","Manufacturer"],"summary":"IEEE-oriented graphical reference for normally closed pushbutton, with public vendor evidence and drawing-reading notes.","description":["The momentary NC pushbutton form describes a normally continuous path opened by the operator. Its circuit role can be stop, inhibit or another command, but that purpose comes from the wiring and label rather than from NC alone.","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":["Evaluate the path before, during and after operation.","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":["Name commanded function","Show terminal pair","State return behaviour"],"distinction":"An NC contact form does not by itself identify a complete emergency-stop safety circuit.","facts":[{"label":"Convention evidence","value":"Autodesk IEEE Symbol Preview — Push Buttons"},{"label":"Public vendor block name","value":"HPB12 (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-863a2eb5-8ecd-4348-90c7-49a37de11b8b","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":["pushbutton-nc","pushbutton-no","emergency-stop","normally-closed-contact"],"artwork":"edu-ansi-pushbutton-nc","publishedOn":"2026-10-14","updatedOn":"2026-10-14","provenance":"independent-public-research","symbolVariant":{"convention":"IEEE / ANSI","form":"Autodesk IEEE-oriented Push Buttons functional form","counterpart":"pushbutton-nc","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-pushbutton-nc","illustration":{"url":"https://eloragrid.ai/library/illustrations/ansi-pushbutton-nc.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-863a2eb5-8ecd-4348-90c7-49a37de11b8b","title":"Autodesk IEEE Symbol Preview — Push Buttons","publisher":"Autodesk","url":"https://help.autodesk.com/cloudhelp/2021/ENU/AutoCAD-Electrical/files/GUID-863A2EB5-8ECD-4348-90C7-49A37DE11B8B.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."}]}