NO
Normally open contact
A contact shown open in the normal state defined for its device.
Schematic
IEEE / ANSI · NO
ANSI/IEEE normally open contact symbol
IEEE-oriented graphical reference for normally open contact, with public vendor evidence and drawing-reading notes.
IEEE / ANSI · Autodesk IEEE-oriented Relays and Contacts functional form
Autodesk explicitly publishes this block under IEEE Symbol Preview. The counterpart is the matching functional concept; no equivalence of every detailed standard graphic is asserted.
Shown as an independently authored educational illustration. Use the cited publication and drawing legend to verify the required drafting form.
Schematic · NO
What it represents
The normally-open relay contact form describes an unoperated open connection in the named IEEE-oriented library. Device tag and terminal references establish which relay or operator controls it; the two conductors are followed as a control path independent of the coil's power circuit.
This is a convention-specific lookup based on the publisher's IEEE-labelled preview. The geometry here is independently drawn to explain the connection or operation; it is not a certified reproduction of the standard graphic.
How to read it
- Read the stated reference condition before analysing the operating sequence.
- Read the selected library and the project legend together. A vendor block identifier is meaningful within its named library and is not a universal standard-symbol code.
Information to show or reference
- Identify parent device tag
- Show terminal pair
- Cross-reference operating element
A distinction that matters
Normally open is a contact state. A complete relay contains operating and contact functions that may appear on different sheets.
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 — Relays and Contacts
Exact public IEEE-oriented category page verifying the component name and vendor block identifier.
IEEE/ANSI 315-1975: graphic symbols for electrical and electronics diagrams
Graphic-symbol standards context and official status; not a source of reproduced artwork.
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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NC
Normally closed contact
A contact shown closed in the normal state defined for its device.
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CO
Changeover contact
A contact arrangement switching a common connection between two contact paths.
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Coil
Relay coil
The operating element associated with a relay and its separately drawn contacts.
Schematic
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