DS 3POS
Three-position disconnector
A three-position disconnector selects between two paths and an intermediate position.
SLD / Schematic
IEEE / ANSI · DS 3POS
ANSI/IEEE Three-position disconnector form
IEEE-library form of three-position disconnector: a three-position disconnector selects between two paths and an intermediate position.
In plain English
What does ANSI/IEEE Three-position disconnector form mean?
This reference locates three-position disconnector in Autodesk's IEEE-oriented disconnect 1 pole family. A three-position disconnector selects between two paths and an intermediate position. Switchgear schematics must define each position and any linked earth or isolation function explicitly. The public library uses HDS11Q89 for its horizontal representation; this is a vendor block name, not an IEEE standards symbol number.
A simple example
Use the surrounding circuit labels and the project legend to identify the intended operating condition and connection. Carry the same device reference into the schedule or equipment document so the symbol can be reconciled with its real terminals, function and operating limits.
What the drawings help you do
The middle position must be labelled rather than assumed to be open or earthed. Three positions describe available states; they do not imply that every transition can occur under load. 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 three-position disconnector: a three-position disconnector selects between two paths and an intermediate position. Three positions describe available states; they do not imply that every transition can occur under load.
- Terminal
- An identified point where a conductor connects.
- Rating
- A value stating the conditions for which equipment is specified.
- Schematic
- A drawing showing function and connections rather than physical appearance.
Read the source: Autodesk IEEE Symbol Preview — Disconnect 1 Pole · Elementary switching devices
IEEE / ANSI · Two Way Disconnect with 3 Positions
Autodesk IEEE Symbol Preview: Disconnect 1 Pole, block HDS11Q89. 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.
SLD / Schematic · DS 3POS
What it represents
This reference locates three-position disconnector in Autodesk's IEEE-oriented disconnect 1 pole family. A three-position disconnector selects between two paths and an intermediate position. Switchgear schematics must define each position and any linked earth or isolation function explicitly. The public library uses HDS11Q89 for its horizontal representation; this is a vendor block name, not an IEEE standards symbol number.
Use the surrounding circuit labels and the project legend to identify the intended operating condition and connection. Carry the same device reference into the schedule or equipment document so the symbol can be reconciled with its real terminals, function and operating limits.
The middle position must be labelled rather than assumed to be open or earthed. Three positions describe available states; they do not imply that every transition can occur under load. 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
- The middle position must be labelled rather than assumed to be open or earthed.
- The preview is an original explanation of this function. Match the actual drawing convention to its legend and the selected equipment documentation.
Information to show or reference
- Name all three positions
- Draw each connected path
- Reference mechanical interlocks
A distinction that matters
Three positions describe available states; they do not imply that every transition can occur under load.
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 — Disconnect 1 Pole
Public IEEE-oriented Disconnect 1 Pole table explicitly lists HDS11Q89 as Two Way Disconnect with 3 Positions. This supports the vendor convention context, not reproduction of the publisher graphic.
Elementary switching devices
Public documentation of this equipment function or named vendor variant; the illustration is independently authored and is not the source 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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