{"schemaVersion":1,"slug":"thermal-magnetic-circuit-breaker","name":"Thermal-magnetic circuit breaker","kind":"symbol","abbreviation":"CB TM","aliases":["HCB11Q9","VCB11Q9"],"category":"power-distribution","drawingTypes":["SLD","Schematic"],"referenceFamilies":["IEC","Manufacturer"],"summary":"A thermal-magnetic breaker combines overload response with a magnetic response to high current.","description":["A thermal-magnetic breaker combines overload response with a magnetic response to high current. Its functional annotation helps distinguish the trip mechanism from an electronic trip unit."],"readingNotes":["A curve designation alone does not state every operating limit or breaking rating.","The preview is an original explanation of this function. Match the actual drawing convention to its legend and the selected equipment documentation."],"drawingChecklist":["Record rated current and curve","Show protected poles","Reference short-circuit rating"],"distinction":"An electronic trip unit may provide similar protection functions through a different measurement and operating system.","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":"HCB11Q9, VCB11Q9 (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-thermal-magnetic-circuit-breaker","publishedOn":"2026-10-13","updatedOn":"2026-10-13","provenance":"independent-public-research","url":"https://eloragrid.ai/symbols/thermal-magnetic-circuit-breaker","illustration":{"url":"https://eloragrid.ai/library/illustrations/thermal-magnetic-circuit-breaker.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."}]}