# Motor overload alarm NO contact

Canonical URL: https://eloragrid.ai/symbols/motor-overload-alarm-no-contact
Publisher: Elora Grid
Updated: 2026-10-13
Lookup label: OL NO
Drawing use: Schematic
Reference families: IEC, Manufacturer

An overload alarm NO contact closes on the documented overload relay operation.

## What it represents

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.

## How to read it

- Verify the contact behaviour after reset and after loss of auxiliary supply.
- The preview is an original explanation of this function. Match the actual drawing convention to its legend and the selected equipment documentation.

## Information to show or reference

- Link overload device
- Identify alarm destination
- Reference contact terminal pair

## Important distinction

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

## Facts

- Drawing role: Contact state
- Representation scope: Functional concept; not an official standard graphic or a product footprint
- Public vendor block reference: HOL21, VOL21 (Autodesk identifiers; not IEC symbol numbers)
- Identifier status: The short label is a functional lookup label, not an assigned IEC or IEEE symbol number. Any separately listed Autodesk code is a verified vendor block name.

## Public references

- [AutoCAD Electrical: Motor control and overloads](https://help.autodesk.com/cloudhelp/2021/ENU/AutoCAD-Electrical/files/GUID-D74101D4-8702-418C-B349-B15EEAEFAA20.htm) — Autodesk. Public documentation of this equipment function or named vendor variant; the illustration is independently authored and is not the source graphic.

## Graphic scope

Independent original educational concept illustration by Elora Grid. Not a certified standards graphic or manufacturer footprint. Unitless; not to scale. Original artwork licence: https://creativecommons.org/licenses/by/4.0/. Publisher material is linked only.