SS
Selector switch
An operator switch selecting between documented control positions.
Schematic
Symbols · SEL 3 HOLD
Three-position maintained selector
A three-position maintained selector stays at the selected position until manually moved.
Schematic · SEL 3 HOLD
What it represents
A three-position maintained selector stays at the selected position until manually moved. The schematic needs a contact-state schedule covering all three positions so modes such as local, off and remote are unambiguous.
How to read it
- Read each contact against the complete position table rather than the operator label alone.
- 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 positions
- Provide contact-state table
- Cross-reference terminal numbers
A distinction that matters
Three maintained positions differ from a selector that spring-returns to centre.
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: Three-position selectors
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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