PB NO
Normally open pushbutton
A pushbutton contact normally shown open before actuation.
Schematic
Symbols · PB NO HOLD
Maintained normally-open pushbutton
A maintained NO pushbutton stays in its actuated condition until the documented return operation.
Schematic · PB NO HOLD
What it represents
A maintained NO pushbutton stays in its actuated condition until the documented return operation. The control sequence must account for the retained input rather than assuming a momentary pulse.
How to read it
- Identify the release method and any reset interlock.
- 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
- State retained position
- Document return action
- Show contact reference
A distinction that matters
A maintained pushbutton is different from a spring-return momentary operator.
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: Illuminated push buttons
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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