{"schemaVersion":1,"slug":"ansi-on-delay-normally-closed-contact","name":"ANSI/IEEE on-delay normally-closed contact symbol","kind":"symbol","abbreviation":"TON NC","aliases":["IEEE on-delay normally-closed contact symbol","ANSI on-delay normally-closed contact symbol","HTD22N"],"category":"control-circuits","drawingTypes":["Schematic"],"referenceFamilies":["IEEE / ANSI","Manufacturer"],"summary":"IEEE-oriented graphical reference for on-delay normally-closed contact, with public vendor evidence and drawing-reading notes.","description":["The on-delay NC contact form specifically describes delayed opening from its reference closed state. The controlled path remains continuous while the specified delay runs, so the timer tag and timing condition are essential circuit-reading information.","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":["Trace the permissive or command during the delay interval.","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":["Identify timer tag","State opening delay","Reference reset condition"],"distinction":"Normally closed describes the initial contact state while on-delay identifies the specified operating transition.","facts":[{"label":"Convention evidence","value":"Autodesk IEEE Symbol Preview — Time Delay Relays"},{"label":"Public vendor block name","value":"HTD22N (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-bbff0443-6ea2-4a05-a761-f411e16ba070","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":["on-delay-normally-closed-contact","relay-coil","normally-closed-contact"],"artwork":"edu-ansi-on-delay-normally-closed-contact","publishedOn":"2026-10-14","updatedOn":"2026-10-14","provenance":"independent-public-research","symbolVariant":{"convention":"IEEE / ANSI","form":"Autodesk IEEE-oriented Time Delay Relays functional form","counterpart":"on-delay-normally-closed-contact","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-on-delay-normally-closed-contact","illustration":{"url":"https://eloragrid.ai/library/illustrations/ansi-on-delay-normally-closed-contact.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-bbff0443-6ea2-4a05-a761-f411e16ba070","title":"Autodesk IEEE Symbol Preview — Time Delay Relays","publisher":"Autodesk","url":"https://help.autodesk.com/cloudhelp/2021/ENU/AutoCAD-Electrical/files/GUID-BBFF0443-6EA2-4A05-A761-F411E16BA070.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."}]}