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

PB NC LAMP ANSI/IEEE illuminated normally-closed pushbutton symbol: original educational illustration

IEEE / ANSI

ANSI/IEEE illuminated normally-closed pushbutton symbol

The illuminated NC pushbutton form retains a normally-closed contact reference while adding a separate visual indication function. Circuit interpretation must establish both the switched control path and the condition energising the lamp.

Drawing use: Schematic
Application: Control circuits
Reference family: IEEE / ANSI / Manufacturer
Form evidence: Autodesk IEEE-oriented Illuminated Push Buttons functional form. Autodesk explicitly publishes this block under IEEE Symbol Preview. The counterpart is the matching functional concept; no equivalence of every detailed standard graphic is asserted.

A distinction that matters

Contact state and lamp state are two separately documented properties of the same assembly.

Full reference

PB NC LAMP Illuminated normally-closed pushbutton: original educational illustration

Symbols

Illuminated normally-closed pushbutton

An illuminated NC pushbutton combines a normally-closed manual contact with a lamp in the operator assembly. Contact operation and illumination can have different circuit sources.

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

A distinction that matters

A normally-closed contact function is independent of the lamp's on or off state.

Full reference

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