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 HOLD

IEEE / ANSI

ANSI/IEEE maintained normally-open pushbutton symbol

The non-auto-return NO pushbutton form identifies a retained operator condition. The control input can remain active after the user's initiating action, so the documented release mechanism is part of the drawing's functional meaning.

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

Mechanical retention is different from a controller remembering a momentary input.

Full referenceAdd to legend

PB NO HOLD

Symbols

Maintained normally-open pushbutton

A maintained NO pushbutton stays in its actuated condition until the documented return operation. The control sequence must account for the retained input rather than assuming a momentary pulse.

Drawing use

Schematic

Application

Control circuits

Reference family

IEC / Manufacturer

A distinction that matters

A maintained pushbutton is different from a spring-return momentary operator.

Full referenceAdd to legend

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