{"schemaVersion":1,"slug":"52-ac-circuit-breaker","name":"AC circuit breaker","kind":"function","abbreviation":"52","aliases":["ANSI 52","AC breaker","52a","52b"],"category":"power-distribution","drawingTypes":["SLD","Schematic"],"referenceFamilies":["IEEE / ANSI"],"summary":"The device-function number identifying an AC circuit breaker.","description":["Device function number 52 identifies an AC circuit breaker in the power-system device-function convention. It can appear in equipment identification, control references or a protection drawing, but it remains distinct from the graphical symbol and product specification.","On a power drawing, keep this function reference connected to the selected equipment and its complete designation. A multifunction relay can implement several numbered functions. This entry explains the reference; it supplies no settings or commissioning procedure."],"readingNotes":["Associate the number with the intended breaker equipment reference.","Read auxiliary-contact and control designations from the applicable documentation."],"drawingChecklist":["Link the breaker equipment tag.","Cross-reference close and trip circuits.","Reference auxiliary contacts and device documentation."],"distinction":"The number 52 identifies a device function. It is not an IEC graphical-symbol identifier, breaker current rating or manufacturer model.","facts":[{"label":"ANSI / IEEE function number","value":"52"},{"label":"Equipment implementation","value":"Consult the selected device manual"},{"label":"Suffix interpretation","value":"Application and manufacturer documentation"}],"references":[{"sourceId":"device-numbers","relevance":"Public manufacturer table used to check the base function-number name."},{"sourceId":"ieee-functions","relevance":"Normative publication reference for the device-function convention."}],"related":["circuit-breaker","normally-open-contact","86-lockout"],"artwork":"function","publishedOn":"2026-10-13","updatedOn":"2026-10-13","provenance":"independent-public-research","url":"https://eloragrid.ai/protection-functions/52-ac-circuit-breaker","illustration":{"url":"https://eloragrid.ai/library/illustrations/52-ac-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":"device-numbers","title":"Public reference table of ANSI device-function numbers","publisher":"Schneider Electric","url":"https://www.se.com/es/es/faqs/FA34639/","type":"manufacturer","scope":"Spanish-language public reference table. Used to check device-number names; no claim that every function is implemented in every device.","checkedOn":"2026-10-13","reuse":"link-only","relevance":"Public manufacturer table used to check the base function-number name."},{"id":"ieee-functions","title":"IEEE C37.2-2022: power-system device function numbers","publisher":"IEEE","url":"https://ieeexplore.ieee.org/document/9984140","type":"standard","scope":"Device function numbers, acronyms and contact designations. The full publication may require access through IEEE.","checkedOn":"2026-10-13","reuse":"link-only","relevance":"Normative publication reference for the device-function convention."}]}