{"schemaVersion":1,"slug":"ansi-key-operated-normally-open-switch","name":"ANSI/IEEE Key-operated normally-open switch form","kind":"symbol","abbreviation":"KEY NO","aliases":["HPB11KS","VPB11KS","IEEE Key Switch, Normally Open","ANSI Key-operated normally-open switch"],"category":"control-circuits","drawingTypes":["Schematic"],"referenceFamilies":["IEEE / ANSI","Manufacturer"],"summary":"IEEE-library form of key-operated normally-open switch: a key-operated NO switch closes a contact through an authorised key mechanism.","description":["This reference locates key-operated normally-open switch in Autodesk's IEEE-oriented miscellaneous switches family. A key-operated NO switch closes a contact through an authorised key mechanism. The schematic needs the operating positions and any key-removal restrictions to explain access control. The public library uses HPB11KS 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.","Check where the key can be inserted or removed. A key switch restricts operation but is not automatically an electrical isolation or safety device. The linked functional counterpart explains the same operating role in its own drawing context; agreement of every detailed convention mark is not asserted."],"readingNotes":["Check where the key can be inserted or removed.","The preview is an original explanation of this function. Match the actual drawing convention to its legend and the selected equipment documentation."],"drawingChecklist":["Label positions","Identify key-removal state","Show contact terminals"],"distinction":"A key switch restricts operation but is not automatically an electrical isolation or safety device.","facts":[{"label":"Convention evidence","value":"Autodesk IEEE Symbol Preview: Miscellaneous Switches; published form: Key Switch, Normally Open."},{"label":"Public vendor block","value":"HPB11KS. Vendor library token, not an IEEE symbol number."},{"label":"Drawing role","value":"Manual operation"},{"label":"Identifier status","value":"The short label is a functional lookup label, not an assigned IEC or IEEE symbol number. Any separately listed Autodesk code is a verified vendor block name."},{"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 HPB11KS as Key Switch, Normally Open. This supports the vendor convention context, not reproduction of the publisher graphic."}],"related":["key-operated-normally-open-switch","pushbutton-no","pushbutton-nc"],"artwork":"s28-ansi-key-operated-normally-open-switch","publishedOn":"2026-10-28","updatedOn":"2026-10-28","provenance":"independent-public-research","symbolVariant":{"convention":"IEEE / ANSI","form":"Key Switch, Normally Open","reference":"Autodesk IEEE Symbol Preview: Miscellaneous Switches, block HPB11KS. Matching functional counterpart linked separately. Independently drawn educational geometry; not a certified IEEE glyph or database identifier.","counterpart":"key-operated-normally-open-switch"},"plainEnglish":{"title":"What does ANSI/IEEE Key-operated normally-open switch form mean?","introduction":"This reference locates key-operated normally-open switch in Autodesk's IEEE-oriented miscellaneous switches family. A key-operated normally open switch closes a contact through an authorised key mechanism. The schematic needs the operating positions and any key-removal restrictions to explain access control. The public library uses HPB11KS 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":"Check where the key can be inserted or removed. A key switch restricts operation but is not automatically an electrical isolation or safety device. 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":"Signal","meaning":"Electrical information passed between devices, rather than necessarily the main power supply."},{"name":"Rating","meaning":"A value stating the conditions for which equipment is specified."}],"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 key-operated normally-open switch: a key-operated normally open switch closes a contact through an authorised key mechanism. A key switch restricts operation but is not automatically an electrical isolation or safety device.","profileId":"reviewed-symbol-20261028"},"url":"https://eloragrid.ai/symbols/ansi-key-operated-normally-open-switch","illustration":{"url":"https://eloragrid.ai/tools/electrical-library/illustrations/ansi-key-operated-normally-open-switch.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 HPB11KS as Key Switch, Normally Open. This supports the vendor convention context, not reproduction of the publisher graphic."}]}