KEY NO
Key-operated normally-open switch
A key-operated NO switch closes a contact through an authorised key mechanism.
Schematic
IEEE / ANSI · KEY NO
ANSI/IEEE Key-operated normally-open switch form
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.
- 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.
Read the source: Autodesk IEEE Symbol Preview — Miscellaneous Switches
IEEE / ANSI · 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.
Shown as an independently authored educational illustration. Use the cited publication and drawing legend to verify the required drafting form.
Schematic · KEY NO
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
A distinction that matters
A key switch restricts operation but is not automatically an electrical isolation or safety device.
Sources you can follow
These public references support the explanation and provide further detail. Their graphics and downloadable files remain with their publishers.
Autodesk IEEE Symbol Preview — Miscellaneous Switches
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.
About this graphic
This illustration was authored independently by Elora Grid to explain the concept. It is not reproduced from a customer drawing, an official standard graphic or a manufacturer CAD file. Its correspondence to an exact IEC or IEEE symbol identifier has not been certified.
SVG and DXF downloads contain this original artwork. DXF uses unscaled drawing units; a GA envelope supplies no product dimensions, clearances or fabrication information. Original artwork is available under CC BY 4.0. Third-party references retain their own terms.
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