{"schemaVersion":1,"slug":"ansi-thermal-magnetic-circuit-breaker","name":"ANSI/IEEE thermal-magnetic circuit breaker symbol","kind":"symbol","abbreviation":"CB TM","aliases":["IEEE thermal-magnetic circuit breaker symbol","ANSI thermal-magnetic circuit breaker symbol","HCB11Q9"],"category":"power-distribution","drawingTypes":["SLD","Schematic"],"referenceFamilies":["IEEE / ANSI","Manufacturer"],"summary":"IEEE-oriented graphical reference for thermal-magnetic circuit breaker, with public vendor evidence and drawing-reading notes.","description":["The thermal-magnetic form combines two protection responses associated with the same breaker. An expanded drawing may show the operating path and additional functional marks, but device selection and coordination still depend on the scheduled breaker and trip data.","This is a convention-specific lookup based on the publisher's IEEE-labelled preview. The geometry here is independently drawn to explain the connection or operation; it is not a certified reproduction of the standard graphic."],"readingNotes":["Read thermal and magnetic operating information separately.","Read the selected library and the project legend together. A vendor block identifier is meaningful within its named library and is not a universal standard-symbol code."],"drawingChecklist":["Name breaker model","Document current and curve","Reference coordination study"],"distinction":"The combination is different from an electronic relay issuing a trip to an otherwise separately protected breaker.","facts":[{"label":"Convention evidence","value":"Autodesk IEEE Symbol Preview — 1 Pole Circuit Breakers"},{"label":"Public vendor block name","value":"HCB11Q9 (Autodesk identifier; not an IEEE symbol number)"},{"label":"Standards context","value":"IEEE/ANSI 315-1975 covers diagram graphics. IEEE lists this edition as Inactive-Reserved."},{"label":"Artwork scope","value":"Original functional illustration; exact standard glyph and compliance are not certified"}],"references":[{"sourceId":"ansi-autodesk-7f08a484-0517-4954-bd68-1648ddbc84a1","relevance":"Exact public IEEE-oriented category page verifying the component name and vendor block identifier."},{"sourceId":"ieee-315","relevance":"Graphic-symbol standards context and official status; not a source of reproduced artwork."}],"related":["thermal-magnetic-circuit-breaker","circuit-breaker","52-ac-circuit-breaker"],"artwork":"edu-ansi-thermal-magnetic-circuit-breaker","publishedOn":"2026-10-14","updatedOn":"2026-10-14","provenance":"independent-public-research","symbolVariant":{"convention":"IEEE / ANSI","form":"Autodesk IEEE-oriented 1 Pole Circuit Breakers functional form","counterpart":"thermal-magnetic-circuit-breaker","reference":"Autodesk explicitly publishes this block under IEEE Symbol Preview. The counterpart is the matching functional concept; no equivalence of every detailed standard graphic is asserted."},"url":"https://eloragrid.ai/symbols/ansi-thermal-magnetic-circuit-breaker","illustration":{"url":"https://eloragrid.ai/library/illustrations/ansi-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":"ansi-autodesk-7f08a484-0517-4954-bd68-1648ddbc84a1","title":"Autodesk IEEE Symbol Preview — 1 Pole Circuit Breakers","publisher":"Autodesk","url":"https://help.autodesk.com/cloudhelp/2021/ENU/AutoCAD-Electrical/files/GUID-7F08A484-0517-4954-BD68-1648DDBC84A1.htm","type":"cad-reference","scope":"Verified public IEEE-oriented vendor catalogue. Block names identify vendor symbols, not IEEE standard symbol numbers. Linked only; graphics and CAD files are not redistributed. IEEE/ANSI 315-1975 is a historical graphics reference with Inactive-Reserved status; this page does not certify current standards compliance.","checkedOn":"2026-10-14","reuse":"link-only","relevance":"Exact public IEEE-oriented category page verifying the component name and vendor block identifier."},{"id":"ieee-315","title":"IEEE/ANSI 315-1975: graphic symbols for electrical and electronics diagrams","publisher":"IEEE Standards Association","url":"https://standards.ieee.org/ieee/315/515/","type":"standard","scope":"Graphic symbols and designation letters. IEEE lists this edition as Inactive-Reserved; it is a historical reference, not a claim of current compliance.","checkedOn":"2026-10-13","reuse":"link-only","relevance":"Graphic-symbol standards context and official status; not a source of reproduced artwork."}]}