Understand the difference.

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

PB NO LAMP

IEEE / ANSI

ANSI/IEEE illuminated normally-open pushbutton symbol

The illuminated NO pushbutton form combines a manually operated contact and a lamp function in one operator assembly. The indication circuit needs its own supply and signal reference, because illumination does not necessarily track the contact position.

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

An illuminated button and a push-to-test lamp combine different operator and indication functions.

Full referenceAdd to legend

PB NO LAMP

Symbols

Illuminated normally-open pushbutton

An illuminated NO pushbutton combines a manual normally-open contact function with an indication lamp. The lamp circuit is drawn or referenced separately because its indication need not follow the contact state.

Drawing use

Schematic

Application

Control circuits

Reference family

IEC / Manufacturer

A distinction that matters

An illuminated actuator does not make its contact a lamp-test contact.

Full referenceAdd to legend

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