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

HSV21

IEC

Solenoid-valve NO auxiliary contact

This form identifies a normally-open auxiliary contact associated with a solenoid valve.

Drawing use: Schematic
Application: Control circuits
Reference family: IEC / Manufacturer
Form evidence: Solenoid-valve NO auxiliary contact. Autodesk IEC-60617 Symbol Preview — Solenoid actuator and feedback forms; vendor family reference, not certified IEC geometry or database identifier.

A distinction that matters

An auxiliary contact is not the power terminal of the solenoid coil.

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.