{"schemaVersion":1,"slug":"circuit-breaker-with-electronic-trip-unit","name":"Circuit breaker with electronic trip unit","kind":"symbol","abbreviation":"CB ETU","aliases":["HCB11Q138","VCB11Q138"],"category":"power-distribution","drawingTypes":["SLD","Schematic"],"referenceFamilies":["IEC","Manufacturer"],"summary":"A breaker electronic trip unit measures current and applies configured protection functions.","description":["A breaker electronic trip unit measures current and applies configured protection functions. A functional tag should link the breaker to its selected trip unit, sensors and settings record."],"readingNotes":["Protection setting letters and function names depend on the trip unit family.","The preview is an original explanation of this function. Match the actual drawing convention to its legend and the selected equipment documentation."],"drawingChecklist":["Name trip unit model","Reference sensor and rating plug","Link protection settings"],"distinction":"The electronic trip unit is part of breaker protection; a remote protection relay is a separate device unless the design documents otherwise.","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":"HCB11Q138, VCB11Q138 (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-electronic-trip-unit","publishedOn":"2026-10-13","updatedOn":"2026-10-13","provenance":"independent-public-research","url":"https://eloragrid.ai/symbols/circuit-breaker-with-electronic-trip-unit","illustration":{"url":"https://eloragrid.ai/library/illustrations/circuit-breaker-with-electronic-trip-unit.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."}]}