{"schemaVersion":1,"slug":"63-pressure-switch-or-relay","name":"Pressure switch or relay","kind":"function","abbreviation":"63","aliases":["pressure relay","pressure switch","Buchholz pressure","ANSI 63","IEEE device 63"],"category":"measurement-protection","drawingTypes":["SLD","Schematic"],"referenceFamilies":["IEEE / ANSI"],"summary":"Provides an electrical response to a gas, liquid or other pressure condition.","description":["Provides an electrical response to a gas, liquid or other pressure condition.","In a drafting package, connect this reference to the monitored vessel or compartment and sensor contact. The associated drawing should trace the pressure alarm, trip or permissive path; the number identifies the role and does not specify the terminal arrangement, ratings or operating settings."],"readingNotes":["Identify the monitored vessel or compartment and sensor contact.","Trace the pressure alarm, trip or permissive path."],"drawingChecklist":["Label the monitored vessel or compartment and sensor contact.","Cross-reference the pressure alarm, trip or permissive path.","Identify the device tag, manual revision and logic drawing that define this implementation."],"distinction":"Pressure supervision is not automatically a Buchholz gas-accumulation function; identify the sensor and the actual operating quantity.","facts":[{"label":"ANSI / IEEE function number","value":"63"},{"label":"Drawing context","value":"The monitored vessel or compartment and sensor contact"},{"label":"Application scope","value":"Protection or apparatus-control role; exact implementation is defined by the equipment documentation."}],"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":["transformer-envelope","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/63-pressure-switch-or-relay","illustration":{"url":"https://eloragrid.ai/library/illustrations/63-pressure-switch-or-relay.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."}]}