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

IEC

IEC pushbutton contact: normally closed push button recessed

A pushbutton translates a person pressing an operator into a change of electrical contact state. The operator form and the contact state are separate pieces of information, so a mushroom head can operate either a normally-open or a normally-closed contact. This entry identifies the normally closed push button recessed form in the publisher's IEC-context family.

Drawing use

Schematic

Application

Control circuits

Reference family

IEC / Manufacturer

Form evidence

Normally Closed Push Button Recessed. Autodesk IEC-60617 Symbol Preview: Push Buttons, HPB12RE / VPB12RE. This identifies the publisher's library context; exact IEC graphics and database identities are not asserted.

A distinction that matters

This entry adds the normally closed push button recessed detail to the broader pushbutton contact family. The head shape and contact drawing do not establish a safety category, contact rating or emergency-stop suitability. Direct opening, reset behaviour and the selected assembly must be confirmed from its documentation.

Full referenceAdd to legend

PB NO

Symbols

Normally open pushbutton

A normally open pushbutton combines an operator-actuated mechanism with a contact shown open in its defined normal state. Momentary and maintained or latching operation are separate characteristics that must be described explicitly.

Drawing use

Schematic

Application

Control circuits

Reference family

IEC / IEEE / ANSI

A distinction that matters

A NO contact symbol by itself does not identify the pushbutton actuator or its mechanical operating mode.

Full referenceAdd to legend

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