Coil
Relay coil
The operating element associated with a relay and its separately drawn contacts.
Schematic
Symbols · TON NO
On-delay normally-open contact
An on-delay NO contact changes from its unoperated open state only after the associated timing condition has persisted for the documented delay.
Schematic · TON NO
What it represents
An on-delay NO contact changes from its unoperated open state only after the associated timing condition has persisted for the documented delay. The contact tag links it to the timer element.
How to read it
- The delay applies to the indicated operating transition, not automatically to both directions.
- 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
- Match timer tag
- Label delayed closing
- Reference reset behaviour
A distinction that matters
A timed contact adds transition information to the basic normally-open state.
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: Time-delay relays
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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