Side-by-side reference

Understand the difference.

Compare the meaning, drawing context and source references of two entries. A similar graphic or shared abbreviation does not establish equivalence.

First referenceCompare with

IEC

Time-delay push switch plan mark

A time-delay push switch, often wired to a staircase timer, turns lighting on when pressed and lets it switch off after a set interval. Plans draw a push-button mark at each push position with a small clock or t tag, and show the timer location in the board where one is used.

Drawing use: GA
Application: Installation & communications
Reference family: IEC
Form evidence: Time-delay push switch. IEC 60617 installation-plan style (architectural and topographical installation symbols); independently drawn, not certified IEC geometry or a database identifier.

A distinction that matters

A momentary bell push is not connected to lighting; a time-delay push switch starts a lighting timer.

Full reference

TON

Symbols

On-delay timer relay

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.

Drawing use: Schematic
Application: Control circuits
Reference family: IEC / Manufacturer

A distinction that matters

On-delay postpones the specified transition on operation; off-delay postpones a transition after removal of the initiating condition.

Full reference

Original educational previews. Follow the source references on each full entry for the appropriate standard or selected product.