# ANSI/IEEE Disconnected mechanical coupling form Canonical URL: https://eloragrid.ai/symbols/ansi-disconnected-mechanical-coupling Publisher: Elora Grid Updated: 2026-10-28 Lookup label: Q021217 Drawing use: Schematic Reference families: IEEE / ANSI, Manufacturer ## Symbol convention Convention: IEEE / ANSI Form: Disconnected Joint 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. Related representation: [Disconnected mechanical coupling](https://eloragrid.ai/symbols/iec-disconnected-mechanical-coupling) IEEE-library form of disconnected mechanical coupling: this indication identifies the disconnected state of a mechanical coupling. ## In plain English ### What does ANSI/IEEE Disconnected mechanical coupling form mean? 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. ### A simple 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. ### What the drawings help you do 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. ### This particular reference 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. ### Terms - Normally open / normally closed: The contact state in the normal condition defined for the drawing. - Terminal: An identified point where a conductor connects. - Signal: Electrical information passed between devices, rather than necessarily the main power supply. Concept diagram: Identify the device and form → Read the connections and state → Check the equipment reference A guide to reading this reference. The original symbol illustration and its drawing notes appear below; these boxes are not a wiring diagram. - [Autodesk IEEE Symbol Preview: Mechanical Controls, Coupling](https://help.autodesk.com/cloudhelp/2021/ENU/AutoCAD-Electrical/files/GUID-3B784797-C632-4E0A-BCDC-D7E4D982FE34.htm) ## What it represents 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. ## How to read it - Read the state within the documented mechanism sequence. - A disconnected coupling state is separate from the isolation of an electrical supply. ## Information to show or reference - 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. ## Important distinction A disconnected coupling state is separate from the isolation of an electrical supply. ## Facts - Convention evidence: Autodesk IEEE Symbol Preview: Mechanical Controls, Coupling; published form: Disconnected Joint. - Public vendor block: Q021217. Vendor library token, not an IEEE symbol number. - Information added: Read the state within the documented mechanism sequence. - Preview: Independent educational concept; consult the publisher and applicable standard for the exact graphic - Artwork scope: Original educational geometry. Exact standard graphics, product ratings and terminal pinouts are not certified. ## Public references - [Autodesk IEEE Symbol Preview: Mechanical Controls, Coupling](https://help.autodesk.com/cloudhelp/2021/ENU/AutoCAD-Electrical/files/GUID-3B784797-C632-4E0A-BCDC-D7E4D982FE34.htm) — Autodesk. 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. ## Graphic scope Independent original educational concept illustration by Elora Grid. Not a certified standards graphic or manufacturer footprint. Unitless; not to scale. Original artwork licence: https://creativecommons.org/licenses/by/4.0/. Publisher material is linked only.