{"schemaVersion":1,"slug":"lockable-switch-disconnector","name":"Lockable switch-disconnector","kind":"symbol","abbreviation":"SD LOCK","aliases":["HDS11Q77","VDS11Q77"],"category":"power-distribution","drawingTypes":["SLD","Schematic"],"referenceFamilies":["IEC","Manufacturer"],"summary":"A lockable switch-disconnector combines an isolation-capable switching device with a documented locking provision.","description":["A lockable switch-disconnector combines an isolation-capable switching device with a documented locking provision. It appears in feeder isolation and maintenance arrangements where both the electrical and mechanical functions matter."],"readingNotes":["Trace the lock provision to the specified handle or operating mechanism.","The preview is an original explanation of this function. Match the actual drawing convention to its legend and the selected equipment documentation."],"drawingChecklist":["State switching duty","Identify open-position locking","Reference the handle assembly"],"distinction":"A locking handle does not increase the switching or fault-interruption rating.","facts":[{"label":"Drawing role","value":"Switching path"},{"label":"Representation scope","value":"Functional concept; not an official standard graphic or a product footprint"},{"label":"Public vendor block reference","value":"HDS11Q77, VDS11Q77 (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-disconnect-variants","relevance":"Public documentation of this equipment function or named vendor variant; the illustration is independently authored and is not the source graphic."},{"sourceId":"switching-devices","relevance":"Public documentation of this equipment function or named vendor variant; the illustration is independently authored and is not the source graphic."}],"related":["disconnector","circuit-breaker"],"artwork":"edu-lockable-switch-disconnector","publishedOn":"2026-10-13","updatedOn":"2026-10-13","provenance":"independent-public-research","url":"https://eloragrid.ai/symbols/lockable-switch-disconnector","illustration":{"url":"https://eloragrid.ai/library/illustrations/lockable-switch-disconnector.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-disconnect-variants","title":"AutoCAD Electrical: Disconnector variants","publisher":"Autodesk","url":"https://help.autodesk.com/cloudhelp/2021/ENU/AutoCAD-Electrical/files/GUID-745AF70A-8A25-4729-AAB7-408A61929B9E.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."},{"id":"switching-devices","title":"Elementary switching devices","publisher":"Schneider Electric — Electrical Installation Guide","url":"https://www.electrical-installation.org/enwiki/Elementary_switching_devices","type":"manufacturer","scope":"Explains disconnectors, load-break switches, contactors and fuses. The manufacturer diagrams remain at the source.","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."}]}