Isolator
Disconnector
A switching device providing an electrical isolation function.
SLD / Schematic
Protection functions · 8
Control power disconnecting device
Isolates the supply feeding a control circuit or control-power bus.
SLD / Schematic · 8
What it represents
Isolates the supply feeding a control circuit or control-power bus.
In a drafting package, connect this reference to the control supply source and disconnect poles. The associated drawing should trace the downstream control circuits and auxiliary contacts; the number identifies the role and does not specify the terminal arrangement, ratings or operating settings.
How to read it
- Identify the control supply source and disconnect poles.
- Trace the downstream control circuits and auxiliary contacts.
Information to show or reference
- Label the control supply source and disconnect poles.
- Cross-reference the downstream control circuits and auxiliary contacts.
- Identify the device tag, manual revision and logic drawing that define this implementation.
A distinction that matters
Control-power isolation does not by itself isolate the associated primary power circuit.
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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