{"schemaVersion":1,"slug":"93-field-changing-contactor","name":"Field-changing contactor","kind":"function","abbreviation":"93","aliases":["field changing","field change contactor","ANSI 93","IEEE device 93"],"category":"measurement-protection","drawingTypes":["SLD","Schematic"],"referenceFamilies":["IEEE / ANSI"],"summary":"Changes the machine excitation connection or arrangement as part of a controlled field sequence.","description":["Changes the machine excitation connection or arrangement as part of a controlled field sequence.","In a drafting package, connect this reference to the field circuits and alternative excitation connections. The associated drawing should trace the field-change coil, contacts and interlocks; the number identifies the role and does not specify the terminal arrangement, ratings or operating settings.","This designation is useful when reading machine and legacy control drawings. Retain the documented function on an existing drawing and consult the original equipment manual before assigning it to a new design."],"readingNotes":["Identify the field circuits and alternative excitation connections.","Trace the field-change coil, contacts and interlocks."],"drawingChecklist":["Label the field circuits and alternative excitation connections.","Cross-reference the field-change coil, contacts and interlocks.","Identify the device tag, manual revision and logic drawing that define this implementation."],"distinction":"Field-changing 93 switches an excitation arrangement; field application 56 initiates application of the field.","facts":[{"label":"ANSI / IEEE function number","value":"93"},{"label":"Drawing context","value":"The field circuits and alternative excitation connections"},{"label":"Application scope","value":"Specialist or legacy machine-control use; interpret with the equipment legend."}],"references":[{"sourceId":"pub-function-abb-secogear","relevance":"Public manufacturer number/name association. Drafting explanations are independently written."},{"sourceId":"ieee-functions","relevance":"Normative device-number publication; exact edition wording and compliance require the licensed standard."}],"related":["generator","52-ac-circuit-breaker"],"artwork":"pub-function-box","publishedOn":"2026-10-13","updatedOn":"2026-10-13","provenance":"independent-public-research","url":"https://eloragrid.ai/protection-functions/93-field-changing-contactor","illustration":{"url":"https://eloragrid.ai/library/illustrations/93-field-changing-contactor.svg","scope":"Original educational concept; not an official standard graphic or product footprint","license":"https://creativecommons.org/licenses/by/4.0/"},"sources":[{"id":"pub-function-abb-secogear","title":"SecoGear medium-voltage switchgear application and technical guide, DET-882","publisher":"ABB","url":"https://library.e.abb.com/public/a06cf4cf38b34800b27bb337ab12f74f/DET-882%20SecoGear%205kV-15kV%20IEEE%20Metal%20Clad%20Switchgear_Application%20and%20installation%20guide.pdf","type":"manufacturer","scope":"Public switchgear application guide with a device-number reference table. Used to cross-check 54, 61, 62 and specialist labels. Text, photographs and manufacturer diagrams are linked only and are not redistributed.","checkedOn":"2026-10-13","reuse":"link-only","relevance":"Public manufacturer number/name association. Drafting explanations are independently written."},{"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 device-number publication; exact edition wording and compliance require the licensed standard."}]}