Understand the difference.

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

Q021210

IEC

Mechanical stop latch in engaged state

This form identifies an engaged stop-latch mechanism. The state describes mechanical retention. The affected device can have separate electrical contacts reporting that position, so engagement is not equivalent to energisation.

Drawing use

Schematic

Application

Control circuits

Reference family

IEC / Manufacturer

Form evidence

Mechanical stop latch in engaged state. Autodesk IEC-60617 Symbol Preview — Mechanical return and interlock qualifiers; vendor family reference, not certified IEC geometry or database identifier.

A distinction that matters

An engaged latch does not automatically indicate a circuit is energised.

Full referenceAdd to legend

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 referenceAdd to legend

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