{"schemaVersion":1,"slug":"ansi-disconnected-mechanical-coupling","name":"ANSI/IEEE Disconnected mechanical coupling form","kind":"symbol","abbreviation":"Q021217","aliases":["Q021217","IEEE Disconnected Joint","ANSI Disconnected mechanical coupling"],"category":"control-circuits","drawingTypes":["Schematic"],"referenceFamilies":["IEEE / ANSI","Manufacturer"],"summary":"IEEE-library form of disconnected mechanical coupling: this indication identifies the disconnected state of a mechanical coupling.","description":["This reference locates disconnected mechanical coupling in Autodesk's IEEE-oriented mechanical controls, coupling family. This indication identifies the disconnected state of a mechanical coupling. The driving and driven elements are represented without an engaged torque or motion-transmission relationship in this state. Either element can still have electrical connections. The public library uses Q021217 for its horizontal representation; this is a vendor block name, not an IEEE standards symbol number.","Read the operating mechanism and the contact reference state together. Cross-reference every associated contact to the same device and show which movement, signal or reset changes its condition; the symbol alone does not establish the complete switching sequence.","Use the state diagram or mechanism schedule to define what causes engagement. The disconnected coupling mark should not be substituted for a power isolation symbol. Read the state within the documented mechanism sequence. A disconnected coupling state is separate from the isolation of an electrical supply. The linked functional counterpart explains the same operating role in its own drawing context; agreement of every detailed convention mark is not asserted."],"readingNotes":["Read the state within the documented mechanism sequence.","A disconnected coupling state is separate from the isolation of an electrical supply."],"drawingChecklist":["Identify the associated device, circuit or diagram boundary.","Read the state within the documented mechanism sequence.","Cross-reference the equipment data, terminal mapping or operating-state legend needed to interpret the form."],"distinction":"A disconnected coupling state is separate from the isolation of an electrical supply.","facts":[{"label":"Convention evidence","value":"Autodesk IEEE Symbol Preview: Mechanical Controls, Coupling; published form: Disconnected Joint."},{"label":"Public vendor block","value":"Q021217. Vendor library token, not an IEEE symbol number."},{"label":"Information added","value":"Read the state within the documented mechanism sequence."},{"label":"Preview","value":"Independent educational concept; consult the publisher and applicable standard for the exact graphic"},{"label":"Artwork scope","value":"Original educational geometry. Exact standard graphics, product ratings and terminal pinouts are not certified."}],"references":[{"sourceId":"s28-ieee-mechanical-controls-coupling","relevance":"Public IEEE-oriented Mechanical Controls, Coupling table explicitly lists Q021217 as Disconnected Joint. This supports the vendor convention context, not reproduction of the publisher graphic."}],"related":["iec-disconnected-mechanical-coupling","relay-coil","normally-open-contact"],"artwork":"s28-ansi-disconnected-mechanical-coupling","publishedOn":"2026-10-28","updatedOn":"2026-10-28","provenance":"independent-public-research","symbolVariant":{"convention":"IEEE / ANSI","form":"Disconnected Joint","reference":"Autodesk IEEE Symbol Preview: Mechanical Controls, Coupling, block Q021217. Matching functional counterpart linked separately. Independently drawn educational geometry; not a certified IEEE glyph or database identifier.","counterpart":"iec-disconnected-mechanical-coupling"},"plainEnglish":{"title":"What does ANSI/IEEE Disconnected mechanical coupling form mean?","introduction":"This reference locates disconnected mechanical coupling in Autodesk's IEEE-oriented mechanical controls, coupling family. This indication identifies the disconnected state of a mechanical coupling. The driving and driven elements are represented without an engaged torque or motion-transmission relationship in this state. Either element can still have electrical connections. The public library uses Q021217 for its horizontal representation; this is a vendor block name, not an IEEE standards symbol number.","example":"Read the operating mechanism and the contact reference state together. Cross-reference every associated contact to the same device and show which movement, signal or reset changes its condition; the symbol alone does not establish the complete switching sequence.","drawings":"Use the state diagram or mechanism schedule to define what causes engagement. The disconnected coupling mark should not be substituted for a power isolation symbol. Read the state within the documented mechanism sequence. A disconnected coupling state is separate from the isolation of an electrical supply. The linked functional counterpart explains the same operating role in its own drawing context; agreement of every detailed convention mark is not asserted.","terms":[{"name":"Normally open / normally closed","meaning":"The contact state in the normal condition defined for the drawing."},{"name":"Terminal","meaning":"An identified point where a conductor connects."},{"name":"Signal","meaning":"Electrical information passed between devices, rather than necessarily the main power supply."}],"diagram":"flow","steps":["Identify the device and form","Read the connections and state","Check the equipment reference"],"caption":"A guide to reading this reference. The original symbol illustration and its drawing notes appear below; these boxes are not a wiring diagram.","sources":[{"label":"Autodesk IEEE Symbol Preview: Mechanical Controls, Coupling","url":"https://help.autodesk.com/cloudhelp/2021/ENU/AutoCAD-Electrical/files/GUID-3B784797-C632-4E0A-BCDC-D7E4D982FE34.htm"}],"detail":"IEEE-library form of disconnected mechanical coupling: this indication identifies the disconnected state of a mechanical coupling. A disconnected coupling state is separate from the isolation of an electrical supply.","profileId":"reviewed-symbol-20261028"},"url":"https://eloragrid.ai/symbols/ansi-disconnected-mechanical-coupling","illustration":{"url":"https://eloragrid.ai/tools/electrical-library/illustrations/ansi-disconnected-mechanical-coupling.svg","scope":"Original educational concept; not an official standard graphic or product footprint","license":"https://creativecommons.org/licenses/by/4.0/"},"sources":[{"id":"s28-ieee-mechanical-controls-coupling","title":"Autodesk IEEE Symbol Preview: Mechanical Controls, Coupling","publisher":"Autodesk","url":"https://help.autodesk.com/cloudhelp/2021/ENU/AutoCAD-Electrical/files/GUID-3B784797-C632-4E0A-BCDC-D7E4D982FE34.htm","type":"cad-reference","scope":"Public mechanical controls, coupling family names and vendor block tokens. Horizontal, vertical and rotated placements are not separate engineering functions. Exact standard geometry is not reproduced.","checkedOn":"2026-10-28","reuse":"link-only","relevance":"Public IEEE-oriented Mechanical Controls, Coupling table explicitly lists Q021217 as Disconnected Joint. This supports the vendor convention context, not reproduction of the publisher graphic."}]}