{"schemaVersion":1,"slug":"ansi-mechanical-interlock-between-devices","name":"ANSI/IEEE Mechanical interlock between devices form","kind":"symbol","abbreviation":"Q021211","aliases":["Q021211","IEEE Interlock Between Two Devices","ANSI Mechanical interlock between devices"],"category":"control-circuits","drawingTypes":["Schematic"],"referenceFamilies":["IEEE / ANSI","Manufacturer"],"summary":"IEEE-library form of mechanical interlock between devices: a mechanical interlock indication links devices whose movements are constrained by a physical relationship.","description":["This reference locates mechanical interlock between devices in Autodesk's IEEE-oriented mechanical controls family. A mechanical interlock indication links devices whose movements are constrained by a physical relationship. A physical interlock constrains the movements of two associated mechanisms. It remains a mechanical relationship even when the electrical circuit also contains permissive contacts. The public library uses Q021211 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 both device tags and the intended exclusive positions to make the relationship readable. Draw any electrical feedback or auxiliary interlock contact separately, since it represents another interface. Identify both devices and the prohibited simultaneous condition. Mechanical interlocking differs from an electrical interlock contact or software permissive. The linked functional counterpart explains the same operating role in its own drawing context; agreement of every detailed convention mark is not asserted."],"readingNotes":["Identify both devices and the prohibited simultaneous condition.","Mechanical interlocking differs from an electrical interlock contact or software permissive."],"drawingChecklist":["Identify the associated device, circuit or diagram boundary.","Identify both devices and the prohibited simultaneous condition.","Cross-reference the equipment data, terminal mapping or operating-state legend needed to interpret the form."],"distinction":"Mechanical interlocking differs from an electrical interlock contact or software permissive.","facts":[{"label":"Convention evidence","value":"Autodesk IEEE Symbol Preview: Mechanical Controls; published form: Interlock Between Two Devices."},{"label":"Public vendor block","value":"Q021211. Vendor library token, not an IEEE symbol number."},{"label":"Information added","value":"Identify both devices and the prohibited simultaneous 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","relevance":"Public IEEE-oriented Mechanical Controls table explicitly lists Q021211 as Interlock Between Two Devices. This supports the vendor convention context, not reproduction of the publisher graphic."}],"related":["iec-mechanical-interlock-between-devices","relay-coil","normally-open-contact"],"artwork":"s28-ansi-mechanical-interlock-between-devices","publishedOn":"2026-10-28","updatedOn":"2026-10-28","provenance":"independent-public-research","symbolVariant":{"convention":"IEEE / ANSI","form":"Interlock Between Two Devices","reference":"Autodesk IEEE Symbol Preview: Mechanical Controls, block Q021211. Matching functional counterpart linked separately. Independently drawn educational geometry; not a certified IEEE glyph or database identifier.","counterpart":"iec-mechanical-interlock-between-devices"},"plainEnglish":{"title":"What does ANSI/IEEE Mechanical interlock between devices form mean?","introduction":"This reference locates mechanical interlock between devices in Autodesk's IEEE-oriented mechanical controls family. A mechanical interlock indication links devices whose movements are constrained by a physical relationship. A physical interlock constrains the movements of two associated mechanisms. It remains a mechanical relationship even when the electrical circuit also contains permissive contacts. The public library uses Q021211 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 both device tags and the intended exclusive positions to make the relationship readable. Draw any electrical feedback or auxiliary interlock contact separately, since it represents another interface. Identify both devices and the prohibited simultaneous condition. Mechanical interlocking differs from an electrical interlock contact or software permissive. 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","url":"https://help.autodesk.com/cloudhelp/2021/ENU/AutoCAD-Electrical/files/GUID-450F6FD7-7A10-4F81-92A1-0D9BECFB23FC.htm"}],"detail":"IEEE-library form of mechanical interlock between devices: a mechanical interlock indication links devices whose movements are constrained by a physical relationship. Mechanical interlocking differs from an electrical interlock contact or software permissive.","profileId":"reviewed-symbol-20261028"},"url":"https://eloragrid.ai/symbols/ansi-mechanical-interlock-between-devices","illustration":{"url":"https://eloragrid.ai/tools/electrical-library/illustrations/ansi-mechanical-interlock-between-devices.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","title":"Autodesk IEEE Symbol Preview: Mechanical Controls","publisher":"Autodesk","url":"https://help.autodesk.com/cloudhelp/2021/ENU/AutoCAD-Electrical/files/GUID-450F6FD7-7A10-4F81-92A1-0D9BECFB23FC.htm","type":"cad-reference","scope":"Public mechanical controls 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 table explicitly lists Q021211 as Interlock Between Two Devices. This supports the vendor convention context, not reproduction of the publisher graphic."}]}