HIN1P29
Clock indication
A clock indication identifies a time display or clock function in the circuit documentation.
IEC
IEC · TSW
Time switch plan mark
Plan mark for a clock-operated time switch that switches a circuit on a programmed schedule.
In plain English
What does Time switch plan mark mean?
A time switch operates a contact according to a daily, weekly or astronomical program. Plans draw a clock face, a circle with hands, combined with a switch stroke or placed in the board, and link it to the controlled circuit such as external lighting or a water heater.
A simple example
Time switches are often mounted in the distribution board on a DIN rail; in that case the plan mark may appear in the board schedule rather than on the floor plan. Where local, it is drawn at the wall. The mark does not state the program, the number of channels or the reserve battery. Those are specified.
What the drawings help you do
Check whether it is board-mounted or local. Look for an associated photocell. A time-delay push switch runs for a fixed period after a press; a time switch follows a clock schedule.
This particular reference
Plan mark for a clock-operated time switch that switches a circuit on a programmed schedule. A time-delay push switch runs for a fixed period after a press; a time switch follows a clock schedule.
- Normally open / normally closed
- The contact state in the normal condition defined for the drawing.
- Schematic
- A drawing showing function and connections rather than physical appearance.
Read the source: IEC graphical symbols for diagrams · AutoCAD Electrical: Instrumentation and sensors
IEC · Time switch
IEC 60617 installation-plan style (architectural and topographical installation symbols); independently drawn, not certified IEC geometry or a database identifier.
Shown as an independently authored educational illustration. Use the cited publication and drawing legend to verify the required drafting form.
GA · TSW
What it represents
A time switch operates a contact according to a daily, weekly or astronomical program. Plans draw a clock face, a circle with hands, combined with a switch stroke or placed in the board, and link it to the controlled circuit such as external lighting or a water heater.
Time switches are often mounted in the distribution board on a DIN rail; in that case the plan mark may appear in the board schedule rather than on the floor plan. Where local, it is drawn at the wall. The mark does not state the program, the number of channels or the reserve battery. Those are specified.
How to read it
- Check whether it is board-mounted or local.
- Look for an associated photocell.
Information to show or reference
- State channels and program type.
- Link to controlled circuits.
- Note contactor if load is large.
A distinction that matters
A time-delay push switch runs for a fixed period after a press; a time switch follows a clock schedule.
Sources you can follow
These public references support the explanation and provide further detail. Their graphics and downloadable files remain with their publishers.
IEC graphical symbols for diagrams
IEC graphical symbol context; independently drawn here.
AutoCAD Electrical: Instrumentation and sensors
Public IEC-oriented family that includes a clock indication form.
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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Time-delay push switch plan mark
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