{"schemaVersion":1,"slug":"mechanically-latched-relay-coil","name":"Mechanically latched relay coil","kind":"symbol","abbreviation":"K LATCH","aliases":["HLR1","VLR1"],"category":"control-circuits","drawingTypes":["Schematic"],"referenceFamilies":["IEC","Manufacturer"],"summary":"A mechanically latched relay retains a documented state after the initiating electrical command is removed.","description":["A mechanically latched relay retains a documented state after the initiating electrical command is removed. The schematic needs both the operating and reset mechanism so the retained state can be understood."],"readingNotes":["Identify the reset or unlatching path instead of assuming removal of coil power releases the contacts.","The preview is an original explanation of this function. Match the actual drawing convention to its legend and the selected equipment documentation."],"drawingChecklist":["Label operating coil","Show reset or unlatch action","Cross-reference retained contacts"],"distinction":"A latched relay retains state; a conventional monostable relay returns when its operating condition is removed.","facts":[{"label":"Drawing role","value":"Relay operation"},{"label":"Representation scope","value":"Functional concept; not an official standard graphic or a product footprint"},{"label":"Public vendor block reference","value":"HLR1, VLR1 (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-contacts","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-open-contact"],"artwork":"edu-mechanically-latched-relay-coil","publishedOn":"2026-10-13","updatedOn":"2026-10-13","provenance":"independent-public-research","url":"https://eloragrid.ai/symbols/mechanically-latched-relay-coil","illustration":{"url":"https://eloragrid.ai/library/illustrations/mechanically-latched-relay-coil.svg","scope":"Original educational concept; not an official standard graphic or product footprint","license":"https://creativecommons.org/licenses/by/4.0/"},"sources":[{"id":"autodesk-contacts","title":"Relays and contacts: public symbol reference","publisher":"Autodesk","url":"https://help.autodesk.com/cloudhelp/2021/ENU/AutoCAD-Electrical/files/GUID-011C62B8-9EC8-485C-B47D-B22A3F7B7574.htm","type":"cad-reference","scope":"Normally open, normally closed and changeover contacts, relay coils and latching relay variants.","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."}]}