Isolator
Disconnector
A switching device providing an electrical isolation function.
SLD / Schematic
Symbols · SSW UNI
Unidirectional semiconductor power switch
A unidirectional semiconductor switch has a specified direction for its power conduction or control behaviour.
SLD / Schematic · SSW UNI
What it represents
A unidirectional semiconductor switch has a specified direction for its power conduction or control behaviour. The functional direction must be identified so reversing a schematic orientation does not reverse the intended meaning.
How to read it
- Use terminal polarity and the product circuit rather than page orientation to determine direction.
- 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
- Show permitted conduction direction
- Identify control polarity
- Reference reverse-voltage capability
A distinction that matters
Unidirectional operation concerns the circuit path; it does not describe the direction of all system power flows.
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: Power semiconductor switches
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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