Q021217
Disconnected mechanical coupling
This indication identifies the disconnected state of a mechanical coupling.
IEC
IEEE / ANSI · Q021217
ANSI/IEEE Disconnected mechanical coupling form
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.
- 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.
Read the source: Autodesk IEEE Symbol Preview: Mechanical Controls, Coupling
IEEE / ANSI · 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.
Shown as an independently authored educational illustration. Use the cited publication and drawing legend to verify the required drafting form.
Schematic · Q021217
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.
A distinction that matters
A disconnected coupling state is separate from the isolation of an electrical supply.
Sources you can follow
These public references support the explanation and provide further detail. Their graphics and downloadable files remain with their publishers.
Autodesk IEEE Symbol Preview: Mechanical Controls, Coupling
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.
About this graphic
This illustration was authored independently by Elora Grid to explain the concept. It is not reproduced from a customer drawing, an official standard graphic or a manufacturer CAD file. Its correspondence to an exact IEC or IEEE symbol identifier has not been certified.
SVG and DXF downloads contain this original artwork. DXF uses unscaled drawing units; a GA envelope supplies no product dimensions, clearances or fabrication information. Original artwork is available under CC BY 4.0. Third-party references retain their own terms.
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