Understand the difference.

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

LS NC

IEEE / ANSI

ANSI/IEEE normally-closed limit switch symbol

The NC limit-switch form describes a reference continuous circuit opened at the documented actuation position. Drawing interpretation needs the travel condition and return action, particularly where the switch participates in a permissive.

Drawing use

Schematic

Application

Control circuits

Reference family

IEEE / ANSI / Manufacturer

Form evidence

Autodesk IEEE-oriented Limit Switches 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

Normally closed does not itself establish a monitored safety or fault-detection function.

Full referenceAdd to legend

LS NC

Symbols

Normally-closed limit switch

A normally-closed limit switch opens when the documented mechanical position actuates it. The reference position must be stated so the logic is interpretable during rest and travel.

Drawing use

Schematic

Application

Control circuits

Reference family

IEC / Manufacturer

A distinction that matters

Normally closed does not by itself establish fault detection or a safety function.

Full referenceAdd to legend

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