SS
Selector switch
An operator switch selecting between documented control positions.
Schematic
Symbols · KEY SEL 3
Three-position key selector
A three-position key selector combines position selection with a key-operated mechanism.
Schematic · KEY SEL 3
What it represents
A three-position key selector combines position selection with a key-operated mechanism. Stable positions, return behaviour and key-removal conditions are all required for a complete control description.
How to read it
- Do not assume that a removable key is allowed in every selected position.
- 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
- List positions
- State key-removal conditions
- Cross-reference contact schedule
A distinction that matters
Key operation adds access control to a selector; it does not change its electrical contact ratings.
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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