Isolator
Disconnector
A switching device providing an electrical isolation function.
SLD / Schematic
Symbols · DS 3POS
Three-position disconnector
A three-position disconnector selects between two paths and an intermediate position.
SLD / Schematic · DS 3POS
What it represents
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.
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.
AutoCAD Electrical: Disconnector variants
Public documentation of this equipment function or named vendor variant; the illustration is independently authored and is not the source 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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