R
Resistor
A resistive component with its value and purpose documented separately.
Schematic
Symbols · VDR
Varistor
A varistor is a voltage-dependent resistive component used in a documented circuit, often for transient limiting.
SLD / Schematic · VDR
What it represents
A varistor is a voltage-dependent resistive component used in a documented circuit, often for transient limiting. Its rating and protected connection are needed beyond the generic outline.
How to read it
- Check continuous-voltage rating separately from clamping-related data.
- 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
- Identify protected terminals
- State selected voltage rating
- Reference energy and surge data
A distinction that matters
A varistor is nonlinear; a fixed resistor does not provide the same voltage-dependent function.
Sources you can follow
These public references support the explanation and provide further detail. Their graphics and downloadable files remain with their publishers.
Resistors and heater-element symbols
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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