{"schemaVersion":1,"slug":"ansi-engaged-mechanical-coupling","name":"ANSI/IEEE Engaged mechanical coupling form","kind":"symbol","abbreviation":"Q021218","aliases":["Q021218","IEEE Engaged Joint","ANSI Engaged mechanical coupling"],"category":"control-circuits","drawingTypes":["Schematic"],"referenceFamilies":["IEEE / ANSI","Manufacturer"],"summary":"IEEE-library form of engaged mechanical coupling: this indication identifies engagement between the represented mechanical elements.","description":["This reference locates engaged mechanical coupling in Autodesk's IEEE-oriented mechanical controls, coupling family. This indication identifies engagement between the represented mechanical elements. The represented elements share the documented motion-transmission relationship in the engaged state. That state says nothing by itself about supply energisation or electrical contact position. The public library uses Q021218 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.","Show the driving/driven device identities and connect the engagement state to its actual feedback if used. Alternate publisher graphical forms are retained within this one concept. Document the elements coupled and the applicable state condition. Different published graphical forms for the same engagement are kept in one concept record. The linked functional counterpart explains the same operating role in its own drawing context; agreement of every detailed convention mark is not asserted."],"readingNotes":["Document the elements coupled and the applicable state condition.","Different published graphical forms for the same engagement are kept in one concept record."],"drawingChecklist":["Identify the associated device, circuit or diagram boundary.","Document the elements coupled and the applicable state condition.","Cross-reference the equipment data, terminal mapping or operating-state legend needed to interpret the form."],"distinction":"Different published graphical forms for the same engagement are kept in one concept record.","facts":[{"label":"Convention evidence","value":"Autodesk IEEE Symbol Preview: Mechanical Controls, Coupling; published form: Engaged Joint."},{"label":"Public vendor block","value":"Q021218. Vendor library token, not an IEEE symbol number."},{"label":"Information added","value":"Document the elements coupled and the applicable state condition."},{"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 Q021218 as Engaged Joint. This supports the vendor convention context, not reproduction of the publisher graphic."}],"related":["iec-engaged-mechanical-coupling","relay-coil","normally-open-contact"],"artwork":"s28-ansi-engaged-mechanical-coupling","publishedOn":"2026-10-28","updatedOn":"2026-10-28","provenance":"independent-public-research","symbolVariant":{"convention":"IEEE / ANSI","form":"Engaged Joint","reference":"Autodesk IEEE Symbol Preview: Mechanical Controls, Coupling, block Q021218. Matching functional counterpart linked separately. Independently drawn educational geometry; not a certified IEEE glyph or database identifier.","counterpart":"iec-engaged-mechanical-coupling"},"plainEnglish":{"title":"What does ANSI/IEEE Engaged mechanical coupling form mean?","introduction":"This reference locates engaged mechanical coupling in Autodesk's IEEE-oriented mechanical controls, coupling family. This indication identifies engagement between the represented mechanical elements. The represented elements share the documented motion-transmission relationship in the engaged state. That state says nothing by itself about supply energisation or electrical contact position. The public library uses Q021218 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":"Show the driving/driven device identities and connect the engagement state to its actual feedback if used. Alternate publisher graphical forms are retained within this one concept. Document the elements coupled and the applicable state condition. Different published graphical forms for the same engagement are kept in one concept record. 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":"Signal","meaning":"Electrical information passed between devices, rather than necessarily the main power supply."},{"name":"Rating","meaning":"A value stating the conditions for which equipment is specified."}],"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 engaged mechanical coupling: this indication identifies engagement between the represented mechanical elements. Different published graphical forms for the same engagement are kept in one concept record.","profileId":"reviewed-symbol-20261028"},"url":"https://eloragrid.ai/symbols/ansi-engaged-mechanical-coupling","illustration":{"url":"https://eloragrid.ai/tools/electrical-library/illustrations/ansi-engaged-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 Q021218 as Engaged Joint. This supports the vendor convention context, not reproduction of the publisher graphic."}]}