# ANSI/IEEE Key-operated normally-open switch form Canonical URL: https://eloragrid.ai/symbols/ansi-key-operated-normally-open-switch Publisher: Elora Grid Updated: 2026-10-28 Lookup label: KEY NO Drawing use: Schematic Reference families: IEEE / ANSI, Manufacturer ## Symbol convention Convention: IEEE / ANSI Form: Key Switch, Normally Open 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. Related representation: [Key-operated normally-open switch](https://eloragrid.ai/symbols/key-operated-normally-open-switch) IEEE-library form of key-operated normally-open switch: a key-operated NO switch closes a contact through an authorised key mechanism. ## In plain English ### What does ANSI/IEEE Key-operated normally-open switch form mean? 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. ### A simple 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. ### What the drawings help you do 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. ### This particular reference 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. ### Terms - Normally open / normally closed: The contact state in the normal condition defined for the drawing. - Signal: Electrical information passed between devices, rather than necessarily the main power supply. - Rating: A value stating the conditions for which equipment is specified. Concept diagram: Identify the device and form → Read the connections and state → Check the equipment reference A guide to reading this reference. The original symbol illustration and its drawing notes appear below; these boxes are not a wiring diagram. - [Autodesk IEEE Symbol Preview — Miscellaneous Switches](https://help.autodesk.com/cloudhelp/2021/ENU/AutoCAD-Electrical/files/GUID-278F6C21-B1A6-4EA1-A535-E78D53BBD10D.htm) ## What it represents 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. ## How to read it - 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. ## Information to show or reference - Label positions - Identify key-removal state - Show contact terminals ## Important distinction A key switch restricts operation but is not automatically an electrical isolation or safety device. ## Facts - Convention evidence: Autodesk IEEE Symbol Preview: Miscellaneous Switches; published form: Key Switch, Normally Open. - Public vendor block: HPB11KS. Vendor library token, not an IEEE symbol number. - Drawing role: Manual operation - Identifier status: 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. - Artwork scope: Original educational geometry. Exact standard graphics, product ratings and terminal pinouts are not certified. ## Public references - [Autodesk IEEE Symbol Preview — Miscellaneous Switches](https://help.autodesk.com/cloudhelp/2021/ENU/AutoCAD-Electrical/files/GUID-278F6C21-B1A6-4EA1-A535-E78D53BBD10D.htm) — Autodesk. 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. ## Graphic scope Independent original educational concept illustration by Elora Grid. Not a certified standards graphic or manufacturer footprint. Unitless; not to scale. Original artwork licence: https://creativecommons.org/licenses/by/4.0/. Publisher material is linked only.