Coil
Relay coil
The operating element associated with a relay and its separately drawn contacts.
Schematic
Symbols · TON
On-delay timer relay
An on-delay timer postpones a specified output transition after its timing condition becomes active.
Schematic · TON
What it represents
An on-delay timer postpones a specified output transition after its timing condition becomes active. The timing input, auxiliary supply and delayed output must be distinguished in the schematic.
How to read it
- Read the timing diagram to establish when the interval starts and how interruption resets it.
- 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
- Show initiating condition
- State time setting
- Link delayed output contact
A distinction that matters
On-delay postpones the specified transition on operation; off-delay postpones a transition after removal of the initiating condition.
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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