{"schemaVersion":1,"slug":"off-delay-timer-relay","name":"Off-delay timer relay","kind":"symbol","abbreviation":"TOFF","aliases":["HTD1F","VTD1F"],"category":"control-circuits","drawingTypes":["Schematic"],"referenceFamilies":["IEC","Manufacturer"],"summary":"An off-delay timer holds a specified output condition for a documented period after its initiating condition is removed.","description":["An off-delay timer holds a specified output condition for a documented period after its initiating condition is removed. Its auxiliary power requirements depend on the selected timer."],"readingNotes":["Determine whether the device needs a continuing supply to complete the delay.","The preview is an original explanation of this function. Match the actual drawing convention to its legend and the selected equipment documentation."],"drawingChecklist":["Show trigger removal condition","State delay interval","Reference supply retention requirements"],"distinction":"Off-delay is not the same as a minimum pulse duration generated when the trigger first arrives.","facts":[{"label":"Drawing role","value":"Timed operation"},{"label":"Representation scope","value":"Functional concept; not an official standard graphic or a product footprint"},{"label":"Public vendor block reference","value":"HTD1F, VTD1F (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-timers","relevance":"Public documentation of this equipment function or named vendor variant; the illustration is independently authored and is not the source graphic."}],"related":["relay-coil","normally-closed-contact"],"artwork":"edu-off-delay-timer-relay","publishedOn":"2026-10-13","updatedOn":"2026-10-13","provenance":"independent-public-research","url":"https://eloragrid.ai/symbols/off-delay-timer-relay","illustration":{"url":"https://eloragrid.ai/library/illustrations/off-delay-timer-relay.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-timers","title":"AutoCAD Electrical: Time-delay relays","publisher":"Autodesk","url":"https://help.autodesk.com/cloudhelp/2021/ENU/AutoCAD-Electrical/files/GUID-DA927086-EEAF-48CB-B9B1-634A4B48C8C7.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."}]}