# Circuit breaker with undervoltage release

Canonical URL: https://eloragrid.ai/symbols/circuit-breaker-with-undervoltage-release
Publisher: Elora Grid
Updated: 2026-10-13
Lookup label: CB UV
Drawing use: SLD, Schematic
Reference families: IEC, Manufacturer

A breaker undervoltage release changes the breaker operating condition when its control voltage falls below the specified range.

## What it represents

A breaker undervoltage release changes the breaker operating condition when its control voltage falls below the specified range. Schematics show the release supply and any associated permissive or trip circuits.

## How to read it

- Follow the control supply separately from the breaker main poles.
- 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 release voltage
- Show release terminals
- Cross-reference loss-of-supply behaviour

## Important distinction

An undervoltage release responds to its own supply; a voltage protection relay can measure another circuit and issue a separate trip.

## Facts

- Drawing role: Circuit interruption
- Representation scope: Functional concept; not an official standard graphic or a product footprint
- Public vendor block reference: HCB11Q33, VCB11Q33 (Autodesk identifiers; not IEC symbol numbers)
- Identifier status: The short label is a functional lookup label, not an assigned IEC or IEEE symbol number. Any separately listed Autodesk code is a verified vendor block name.

## Public references

- [Circuit-breaker symbol variants](https://help.autodesk.com/cloudhelp/2021/ENU/AutoCAD-Electrical/files/GUID-DB1548A3-A4D3-47E5-86AC-37000DC57D80.htm) — Autodesk. Public documentation of this equipment function or named vendor variant; the illustration is independently authored and is not the source graphic.
- [Fundamental characteristics of a circuit-breaker](https://www.electrical-installation.org/enwiki/Fundamental_characteristics_of_a_circuit-breaker) — Schneider Electric — Electrical Installation Guide. Public documentation of this equipment function or named vendor variant; the illustration is independently authored and is not the source graphic.

## 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.