# Carbon-disc variable resistor

Canonical URL: https://eloragrid.ai/symbols/iec-carbon-disc-variable-resistor
Publisher: Elora Grid
Updated: 2026-10-14
Lookup label: HVR1R8
Drawing use: Schematic
Reference families: IEC, Manufacturer

## Symbol convention

Convention: IEC
Form: Carbon-disc variable resistor
Autodesk IEC-60617 Symbol Preview — Resistive component forms; vendor family reference, not certified IEC geometry or database identifier.

This representation identifies the publisher's carbon-disc variable-resistance form.

## What it represents

This representation identifies the publisher's carbon-disc variable-resistance form. The publisher identifies a variable resistive form using carbon discs as part of its operating construction. That identifies a component principle without assigning a resistance law or power rating.
Document the actual control mechanism and terminal arrangement where the device appears in a legacy circuit. It should not be silently replaced with a potentiometer having a different connection and operating behaviour.

## How to read it

- State the resistance-control mechanism and associated terminals in the equipment description.
- The material/mechanism indication is distinct from a generic electronic potentiometer.

## Information to show or reference

- Identify the associated device, circuit or diagram boundary.
- State the resistance-control mechanism and associated terminals in the equipment description.
- Cross-reference the equipment data, terminal mapping or operating-state legend needed to interpret the form.

## Important distinction

The material/mechanism indication is distinct from a generic electronic potentiometer.

## Facts

- Reference scope: Specific public IEC-context family form
- Publisher reference token: HVR1R8 (Autodesk token; not a verified IEC database ID)
- Information added: State the resistance-control mechanism and associated terminals in the equipment description.
- Preview: Independent educational concept; consult the publisher and applicable standard for the exact graphic

## Public references

- [Resistors and heater-element symbols](https://help.autodesk.com/cloudhelp/2021/ENU/AutoCAD-Electrical/files/GUID-1D071951-D38E-4B15-8B9E-C30ECBD55C19.htm) — Autodesk. Official public publisher family name and reference context; vendor identifiers and graphics are distinct from licensed IEC database content.

## Graphic scope

Independent original educational concept illustration by Elora Grid. Not a certified standards graphic or manufacturer footprint. Unitless; not to scale. Original artwork licence: https://creativecommons.org/licenses/by/4.0/. Publisher material is linked only.