{"schemaVersion":1,"slug":"circuit-breaker-with-undervoltage-release","name":"Circuit breaker with undervoltage release","kind":"symbol","abbreviation":"CB UV","aliases":["HCB11Q33","VCB11Q33"],"category":"power-distribution","drawingTypes":["SLD","Schematic"],"referenceFamilies":["IEC","Manufacturer"],"summary":"A breaker undervoltage release changes the breaker operating condition when its control voltage falls below the specified range.","description":["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."],"readingNotes":["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."],"drawingChecklist":["Identify release voltage","Show release terminals","Cross-reference loss-of-supply behaviour"],"distinction":"An undervoltage release responds to its own supply; a voltage protection relay can measure another circuit and issue a separate trip.","facts":[{"label":"Drawing role","value":"Circuit interruption"},{"label":"Representation scope","value":"Functional concept; not an official standard graphic or a product footprint"},{"label":"Public vendor block reference","value":"HCB11Q33, VCB11Q33 (Autodesk identifiers; not IEC symbol numbers)"},{"label":"Identifier status","value":"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."}],"references":[{"sourceId":"autodesk-breakers","relevance":"Public documentation of this equipment function or named vendor variant; the illustration is independently authored and is not the source graphic."},{"sourceId":"breaker-characteristics","relevance":"Public documentation of this equipment function or named vendor variant; the illustration is independently authored and is not the source graphic."}],"related":["circuit-breaker","52-ac-circuit-breaker"],"artwork":"edu-circuit-breaker-with-undervoltage-release","publishedOn":"2026-10-13","updatedOn":"2026-10-13","provenance":"independent-public-research","url":"https://eloragrid.ai/symbols/circuit-breaker-with-undervoltage-release","illustration":{"url":"https://eloragrid.ai/library/illustrations/circuit-breaker-with-undervoltage-release.svg","scope":"Original educational concept; not an official standard graphic or product footprint","license":"https://creativecommons.org/licenses/by/4.0/"},"sources":[{"id":"autodesk-breakers","title":"Circuit-breaker symbol variants","publisher":"Autodesk","url":"https://help.autodesk.com/cloudhelp/2021/ENU/AutoCAD-Electrical/files/GUID-DB1548A3-A4D3-47E5-86AC-37000DC57D80.htm","type":"cad-reference","scope":"Circuit-breaker variants and thermal, magnetic and differential qualifiers.","checkedOn":"2026-10-13","reuse":"link-only","relevance":"Public documentation of this equipment function or named vendor variant; the illustration is independently authored and is not the source graphic."},{"id":"breaker-characteristics","title":"Fundamental characteristics of a circuit-breaker","publisher":"Schneider Electric — Electrical Installation Guide","url":"https://www.electrical-installation.org/enwiki/Fundamental_characteristics_of_a_circuit-breaker","type":"manufacturer","scope":"Voltage, current, tripping and breaking-capacity concepts; not a product selection or settings prescription.","checkedOn":"2026-10-13","reuse":"link-only","relevance":"Public documentation of this equipment function or named vendor variant; the illustration is independently authored and is not the source graphic."}]}