# ANSI/IEEE Three-position disconnector form Canonical URL: https://eloragrid.ai/symbols/ansi-three-position-disconnector Publisher: Elora Grid Updated: 2026-10-28 Lookup label: DS 3POS Drawing use: SLD, Schematic Reference families: IEEE / ANSI, Manufacturer ## Symbol convention Convention: IEEE / ANSI Form: 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. Related representation: [Three-position disconnector](https://eloragrid.ai/symbols/three-position-disconnector) 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. ### Terms - 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. 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 — Disconnect 1 Pole](https://help.autodesk.com/cloudhelp/2021/ENU/AutoCAD-Electrical/files/GUID-7C62D3DE-6494-4CBF-B3CF-3E3DA309D6A4.htm) - [Elementary switching devices](https://www.electrical-installation.org/enwiki/Elementary_switching_devices) ## 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 ## Important distinction Three positions describe available states; they do not imply that every transition can occur under load. ## Facts - Convention evidence: Autodesk IEEE Symbol Preview: Disconnect 1 Pole; published form: Two Way Disconnect with 3 Positions. - Public vendor block: HDS11Q89. Vendor library token, not an IEEE symbol number. - Drawing role: Switching path - Identifier status: The short label is a functional lookup label, not an assigned IEC or IEEE symbol number. Any separately listed Autodesk code is a verified vendor block name. - Artwork scope: Original educational geometry. Exact standard graphics, product ratings and terminal pinouts are not certified. ## Public references - [Autodesk IEEE Symbol Preview — Disconnect 1 Pole](https://help.autodesk.com/cloudhelp/2021/ENU/AutoCAD-Electrical/files/GUID-7C62D3DE-6494-4CBF-B3CF-3E3DA309D6A4.htm) — Autodesk. 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](https://www.electrical-installation.org/enwiki/Elementary_switching_devices) — Schneider Electric — Electrical Installation Guide. Public documentation of this equipment function or named vendor variant; the illustration is independently authored and is not the source 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.