SS
Selector switch
An operator switch selecting between documented control positions.
Schematic
Protection functions · 69
Permissive control device
Permits or prevents an equipment operation according to a selected control condition.
SLD / Schematic · 69
What it represents
Permits or prevents an equipment operation according to a selected control condition.
In a drafting package, connect this reference to the permissive selector or control input. The associated drawing should trace the inhibited or enabled operating command; the number identifies the role and does not specify the terminal arrangement, ratings or operating settings.
How to read it
- Identify the permissive selector or control input.
- Trace the inhibited or enabled operating command.
Information to show or reference
- Label the permissive selector or control input.
- Cross-reference the inhibited or enabled operating command.
- Identify the device tag, manual revision and logic drawing that define this implementation.
A distinction that matters
A permissive control establishes command authority; a numbered interlocking relay may separately verify apparatus state.
Sources you can follow
These public references support the explanation and provide further detail. Their graphics and downloadable files remain with their publishers.
ANSI device-number and suffix reference table
Public manufacturer number/name association. Drafting explanations are independently written.
IEEE C37.2-2022: power-system device function numbers
Normative device-number publication; exact edition wording and compliance require the licensed standard.
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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