{"schemaVersion":1,"slug":"ansi-three-point-current-measurement-selector","name":"ANSI/IEEE Three-point current measurement selector form","kind":"symbol","abbreviation":"HSW1S94","aliases":["HSW1S94","VSW1S94","IEEE Current Switch For 3 Measurement Points","ANSI Three-point current measurement selector"],"category":"measurement-protection","drawingTypes":["Schematic"],"referenceFamilies":["IEEE / ANSI","Manufacturer"],"summary":"IEEE-library form of three-point current measurement selector: this representation identifies selection among three current-measurement points.","description":["This reference locates three-point current measurement selector in Autodesk's IEEE-oriented miscellaneous switches family. This representation identifies selection among three current-measurement points. The meter is connected to one of three documented current-measurement circuits. When CT secondaries are involved, the selected switch arrangement must be considered with their continuity and test provisions. The public library uses HSW1S94 for its horizontal representation; this is a vendor block name, not an IEEE standards symbol number.","Read the operating mechanism and the contact reference state together. Cross-reference every associated contact to the same device and show which movement, signal or reset changes its condition; the symbol alone does not establish the complete switching sequence.","Document the exact terminal and switching scheme from the selected equipment. The concept is an interpretation reference rather than a field switching or testing procedure. Coordinate CT secondary handling and the selected meter-switch connection scheme. A current selector cannot be treated as an ordinary voltage selector because CT circuits require documented continuity arrangements. The linked functional counterpart explains the same operating role in its own drawing context; agreement of every detailed convention mark is not asserted."],"readingNotes":["Coordinate CT secondary handling and the selected meter-switch connection scheme.","A current selector cannot be treated as an ordinary voltage selector because CT circuits require documented continuity arrangements."],"drawingChecklist":["Identify the associated device, circuit or diagram boundary.","Coordinate CT secondary handling and the selected meter-switch connection scheme.","Cross-reference the equipment data, terminal mapping or operating-state legend needed to interpret the form."],"distinction":"A current selector cannot be treated as an ordinary voltage selector because CT circuits require documented continuity arrangements.","facts":[{"label":"Convention evidence","value":"Autodesk IEEE Symbol Preview: Miscellaneous Switches; published form: Current Switch For 3 Measurement Points."},{"label":"Public vendor block","value":"HSW1S94. Vendor library token, not an IEEE symbol number."},{"label":"Information added","value":"Coordinate CT secondary handling and the selected meter-switch connection scheme."},{"label":"Preview","value":"Independent educational concept; consult the publisher and applicable standard for the exact graphic"},{"label":"Artwork scope","value":"Original educational geometry. Exact standard graphics, product ratings and terminal pinouts are not certified."}],"references":[{"sourceId":"ansi-autodesk-278f6c21-b1a6-4ea1-a535-e78d53bbd10d","relevance":"Public IEEE-oriented Miscellaneous Switches table explicitly lists HSW1S94 as Current Switch For 3 Measurement Points. This supports the vendor convention context, not reproduction of the publisher graphic."}],"related":["iec-three-point-current-measurement-selector","current-transformer","voltage-transformer"],"artwork":"s28-ansi-three-point-current-measurement-selector","publishedOn":"2026-10-28","updatedOn":"2026-10-28","provenance":"independent-public-research","symbolVariant":{"convention":"IEEE / ANSI","form":"Current Switch For 3 Measurement Points","reference":"Autodesk IEEE Symbol Preview: Miscellaneous Switches, block HSW1S94. Matching functional counterpart linked separately. Independently drawn educational geometry; not a certified IEEE glyph or database identifier.","counterpart":"iec-three-point-current-measurement-selector"},"plainEnglish":{"title":"What does ANSI/IEEE Three-point current measurement selector form mean?","introduction":"This reference locates three-point current measurement selector in Autodesk's IEEE-oriented miscellaneous switches family. This representation identifies selection among three current-measurement points. The meter is connected to one of three documented current-measurement circuits. When CT secondaries are involved, the selected switch arrangement must be considered with their continuity and test provisions. The public library uses HSW1S94 for its horizontal representation; this is a vendor block name, not an IEEE standards symbol number.","example":"Read the operating mechanism and the contact reference state together. Cross-reference every associated contact to the same device and show which movement, signal or reset changes its condition; the symbol alone does not establish the complete switching sequence.","drawings":"Document the exact terminal and switching scheme from the selected equipment. The concept is an interpretation reference rather than a field switching or testing procedure. Coordinate CT secondary handling and the selected meter-switch connection scheme. A current selector cannot be treated as an ordinary voltage selector because CT circuits require documented continuity arrangements. The linked functional counterpart explains the same operating role in its own drawing context; agreement of every detailed convention mark is not asserted.","terms":[{"name":"Normally open / normally closed","meaning":"The contact state in the normal condition defined for the drawing."},{"name":"Terminal","meaning":"An identified point where a conductor connects."},{"name":"Signal","meaning":"Electrical information passed between devices, rather than necessarily the main power supply."}],"diagram":"flow","steps":["Identify the device and form","Read the connections and state","Check the equipment reference"],"caption":"A guide to reading this reference. The original symbol illustration and its drawing notes appear below; these boxes are not a wiring diagram.","sources":[{"label":"Autodesk IEEE Symbol Preview — Miscellaneous Switches","url":"https://help.autodesk.com/cloudhelp/2021/ENU/AutoCAD-Electrical/files/GUID-278F6C21-B1A6-4EA1-A535-E78D53BBD10D.htm"}],"detail":"IEEE-library form of three-point current measurement selector: this representation identifies selection among three current-measurement points. A current selector cannot be treated as an ordinary voltage selector because CT circuits require documented continuity arrangements.","profileId":"reviewed-symbol-20261028"},"url":"https://eloragrid.ai/symbols/ansi-three-point-current-measurement-selector","illustration":{"url":"https://eloragrid.ai/tools/electrical-library/illustrations/ansi-three-point-current-measurement-selector.svg","scope":"Original educational concept; not an official standard graphic or product footprint","license":"https://creativecommons.org/licenses/by/4.0/"},"sources":[{"id":"ansi-autodesk-278f6c21-b1a6-4ea1-a535-e78d53bbd10d","title":"Autodesk IEEE Symbol Preview — Miscellaneous Switches","publisher":"Autodesk","url":"https://help.autodesk.com/cloudhelp/2021/ENU/AutoCAD-Electrical/files/GUID-278F6C21-B1A6-4EA1-A535-E78D53BBD10D.htm","type":"cad-reference","scope":"Verified public IEEE-oriented vendor catalogue. Block names identify vendor symbols, not IEEE standard symbol numbers. Linked only; graphics and CAD files are not redistributed. IEEE/ANSI 315-1975 is a historical graphics reference with Inactive-Reserved status; this page does not certify current standards compliance.","checkedOn":"2026-10-14","reuse":"link-only","relevance":"Public IEEE-oriented Miscellaneous Switches table explicitly lists HSW1S94 as Current Switch For 3 Measurement Points. This supports the vendor convention context, not reproduction of the publisher graphic."}]}