{"schemaVersion":1,"slug":"miniature-circuit-breaker","name":"Miniature circuit breaker","kind":"symbol","abbreviation":"MCB","aliases":["miniature breaker"],"category":"power-distribution","drawingTypes":["SLD","Schematic"],"referenceFamilies":["IEC","Manufacturer"],"summary":"An MCB is a compact low-voltage circuit breaker commonly used for final circuits and auxiliary supplies.","description":["An MCB is a compact low-voltage circuit breaker commonly used for final circuits and auxiliary supplies. Its symbol must be accompanied by the actual rating, pole count and applicable device standard."],"readingNotes":["Do not infer interrupting rating from the MCB abbreviation.","The preview is an original explanation of this function. Match the actual drawing convention to its legend and the selected equipment documentation."],"drawingChecklist":["State current rating and curve","State pole arrangement","Reference product breaking rating"],"distinction":"MCB describes a product family; thermal-magnetic describes an operating mechanism.","facts":[{"label":"Drawing role","value":"Circuit interruption"},{"label":"Representation scope","value":"Functional concept; not an official standard graphic or a product footprint"},{"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":"pub-symbol-breaker-types","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-miniature-circuit-breaker","publishedOn":"2026-10-13","updatedOn":"2026-10-13","provenance":"independent-public-research","url":"https://eloragrid.ai/symbols/miniature-circuit-breaker","illustration":{"url":"https://eloragrid.ai/library/illustrations/miniature-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":"pub-symbol-breaker-types","title":"Circuit breakers and switches","publisher":"Schneider Electric","url":"https://www.se.com/au/en/product-category/4200-circuit-breakers-and-switches/","type":"manufacturer","scope":"Public manufacturer explanation of the equipment function and selection context.","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."}]}