PB NO
Normally open pushbutton
A pushbutton contact normally shown open before actuation.
Schematic
Symbols · KEY NO
Key-operated normally-open switch
A key-operated NO switch closes a contact through an authorised key mechanism.
Schematic · KEY NO
What it represents
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.
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.
AutoCAD Electrical: Level, flow, keyed and measurement switches
Public documentation of this equipment function or named vendor variant; the illustration is independently authored and is not the source 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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