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

OL NO

IEEE / ANSI

ANSI/IEEE motor overload alarm no contact symbol

The overload NO contact form identifies a signal path associated with overload-device operation. Its destination may be a lamp, controller or alarm circuit and is separate from the contact used to interrupt the motor command.

Drawing use: Schematic
Application: Control circuits
Reference family: IEEE / ANSI / Manufacturer
Form evidence: Autodesk IEEE-oriented Motor Control 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

Overload alarm status and contactor closed-position status describe different equipment conditions.

Full reference

OL NO

Symbols

Motor overload alarm NO contact

An overload alarm NO contact closes on the documented overload relay operation. The schematic identifies the alarm or feedback path independently of the motor-stopping contact.

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

A distinction that matters

A trip alarm contact is different from a contactor position indication contact.

Full reference

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