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

LS NO

IEEE / ANSI

ANSI/IEEE normally-open limit switch symbol

The NO limit-switch form links a discrete contact to mechanical position or travel. Its electrical state is only interpretable after the drawing identifies the actuated equipment position and the switch's reference condition.

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

A limit switch senses equipment movement; a manually operated pushbutton supplies an operator command.

Full reference

LS NO

Symbols

Normally-open limit switch

A normally-open limit switch closes when the documented mechanical travel or position condition actuates it. It identifies a position input rather than the complete mechanical arrangement.

Drawing use: Schematic
Application: Control circuits
Reference family: IEC / Manufacturer

A distinction that matters

A limit switch responds to mechanical position; a pushbutton responds to an operator action.

Full reference

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