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

Q021404

IEC

Gas-flow actuation qualifier

A gas-flow qualifier identifies operation responding to gas movement. Gas-flow actuation identifies the moving-gas condition used by the device. It is not equivalent to a static pressure condition, even where both participate in one ventilation or process sequence.

Drawing use: Schematic
Application: Control circuits
Reference family: IEC / Manufacturer
Form evidence: Gas-flow actuation qualifier. Autodesk IEC-60617 Symbol Preview — Operating-device and function qualifiers; vendor family reference, not certified IEC geometry or database identifier.

A distinction that matters

Gas flow and gas pressure are different process quantities.

Full reference

Coil

Symbols

Relay coil

A relay coil represents an operating element that changes the state of associated contacts when the device operates. Coil and contact representations are often drawn in different locations to make the circuit easier to read. Their shared identifier and cross-references establish the relationship.

Drawing use: Schematic
Application: Control circuits
Reference family: IEC / IEEE / ANSI

A distinction that matters

A relay coil is not a contactor power pole. Similar operating-element marks can represent equipment with different switching duties.

Full reference

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