VDR
Varistor
A varistor is a voltage-dependent resistive component used in a documented circuit, often for transient limiting.
SLD / Schematic
IEEE / ANSI · VDR
ANSI/IEEE varistor symbol
IEEE-oriented graphical reference for varistor, with public vendor evidence and drawing-reading notes.
IEEE / ANSI · Autodesk IEEE-oriented Resistive Components functional form
Autodesk explicitly publishes this block under IEEE Symbol Preview. The counterpart is the matching functional concept; no equivalence of every detailed standard graphic is asserted.
Shown as an independently authored educational illustration. Use the cited publication and drawing legend to verify the required drafting form.
SLD / Schematic · VDR
What it represents
The varistor form adds a voltage-dependent characteristic to a resistive component. The connection point and selected voltage and surge data establish the protective use; its drawing modifier does not replace the equipment rating.
This is a convention-specific lookup based on the publisher's IEEE-labelled preview. The geometry here is independently drawn to explain the connection or operation; it is not a certified reproduction of the standard graphic.
How to read it
- Check continuous-voltage duty separately from surge-limiting data.
- Read the selected library and the project legend together. A vendor block identifier is meaningful within its named library and is not a universal standard-symbol code.
Information to show or reference
- Name protected nodes
- State voltage rating
- Reference surge capability
A distinction that matters
A nonlinear varistor and a fixed current-limiting resistor do not provide the same response.
Sources you can follow
These public references support the explanation and provide further detail. Their graphics and downloadable files remain with their publishers.
Autodesk IEEE Symbol Preview — Resistive Components
Exact public IEEE-oriented category page verifying the component name and vendor block identifier.
IEEE/ANSI 315-1975: graphic symbols for electrical and electronics diagrams
Graphic-symbol standards context and official status; not a source of reproduced artwork.
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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