{"schemaVersion":1,"slug":"89-line-switch","name":"Line switch","kind":"function","abbreviation":"89","aliases":["ANSI 89","line disconnector","line disconnect"],"category":"power-distribution","drawingTypes":["SLD","Schematic"],"referenceFamilies":["IEEE / ANSI"],"summary":"The device-function number used for a line-switching or disconnecting device in its documented application.","description":["Device function number 89 identifies a line switch in the power-system device-function convention. The selected equipment and drawing context establish its actual operating duties and capabilities; the number is not a substitute for a switch 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":["Identify the physical device associated with the reference.","Read switching, isolation and position information separately."],"drawingChecklist":["Link the equipment identification.","Reference the selected device capabilities.","Cross-reference control and position circuits."],"distinction":"The number 89 and number 52 identify different device functions. A drawing reference does not establish equivalent interruption capability.","facts":[{"label":"ANSI / IEEE function number","value":"89"},{"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":["disconnector","load-break-switch","52-ac-circuit-breaker"],"artwork":"function","publishedOn":"2026-10-13","updatedOn":"2026-10-13","provenance":"independent-public-research","url":"https://eloragrid.ai/protection-functions/89-line-switch","illustration":{"url":"https://eloragrid.ai/library/illustrations/89-line-switch.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."}]}