Isolator
Disconnector
A switching device providing an electrical isolation function.
SLD / Schematic
Symbols · SD LOCK
Lockable switch-disconnector
A lockable switch-disconnector combines an isolation-capable switching device with a documented locking provision.
SLD / Schematic · SD LOCK
What it represents
A lockable switch-disconnector combines an isolation-capable switching device with a documented locking provision. It appears in feeder isolation and maintenance arrangements where both the electrical and mechanical functions matter.
How to read it
- Trace the lock provision to the specified handle or operating mechanism.
- 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
- State switching duty
- Identify open-position locking
- Reference the handle assembly
A distinction that matters
A locking handle does not increase the switching or fault-interruption rating.
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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