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

E-stop

Symbols

Emergency-stop operator

An emergency-stop operator is identified by its intended function and the properties of the selected device. A schematic may show its contact blocks, actuator and reset or latching features. The drawing must connect those features to the operator description and the complete control-system design.

Drawing use: Schematic
Application: Control circuits
Reference family: IEC / IEEE / ANSI

A distinction that matters

Emergency stop is a system function. A generic mushroom pushbutton depiction does not certify an emergency-stop implementation.

Full reference

PB NC

Symbols

Normally closed pushbutton

A normally closed pushbutton has a contact closed in its specified normal state. Actuation changes that contact state according to the selected operator and contact block. Momentary, maintained, latching and positive-opening characteristics must be identified from device documentation.

Drawing use: Schematic
Application: Control circuits
Reference family: IEC / IEEE / ANSI

A distinction that matters

An ordinary NC pushbutton and an emergency-stop device are not interchangeable solely because both drawings show a closed contact.

Full reference

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