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

Room thermostat plan mark

A room thermostat is drawn as a small circle or square with a temperature mark, a theta or the letter T, at its wall position. A control link connects it to the heater, valve or air-conditioning unit it controls.

Drawing use: GA
Application: Installation & communications
Reference family: IEC
Form evidence: Thermostat. 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 schematic temperature switch shows a contact; the plan mark locates the room control.

Full reference

TS NO

Symbols

Temperature switch NO

A temperature-operated NO switch changes from open to closed under its specified actuation condition. The drawing must identify the sensed location and temperature direction.

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

A distinction that matters

A temperature switch provides a discrete contact state; an RTD provides a resistance measurement.

Full reference

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