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 NC HOLD

IEEE / ANSI

ANSI/IEEE maintained normally-closed pushbutton symbol

The non-auto-return NC pushbutton form identifies a contact that is closed in its reference state and retained after the operator changes it. The release or reset description determines when continuity is restored.

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

A retained NC operator is not automatically an emergency-stop device.

Full referenceAdd to legend

PB NC HOLD

Symbols

Maintained normally-closed pushbutton

A maintained NC pushbutton retains its actuated open state until the documented return action. This affects permissive and stopping circuits that depend on contact continuity.

Drawing use

Schematic

Application

Control circuits

Reference family

IEC / Manufacturer

A distinction that matters

Maintained NC operation does not alone establish an emergency-stop safety function.

Full referenceAdd to legend

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