NO
Normally open contact
A contact shown open in the normal state defined for its device.
Schematic
Symbols · NC UNLATCH
Manually unlatched NC contact
A manually unlatched NC contact has a mechanical retained state and a documented manual release.
Schematic · NC UNLATCH
What it represents
A manually unlatched NC contact has a mechanical retained state and a documented manual release. Its reference state is closed but the retained operated position must be stated.
How to read it
- Confirm which contact position the mechanism retains.
- 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 reference and retained states
- Identify manual release
- Link associated device
A distinction that matters
A mechanical retention marker must not be confused with a delayed-return timer marker.
Sources you can follow
These public references support the explanation and provide further detail. Their graphics and downloadable files remain with their publishers.
Relays and contacts: public symbol reference
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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