NO
Normally open contact
A contact shown open in the normal state defined for its device.
Schematic
Symbols · OL NO
Motor overload alarm NO contact
An overload alarm NO contact closes on the documented overload relay operation.
Schematic · OL NO
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
A distinction that matters
A trip alarm contact is different from a contactor position indication contact.
Sources you can follow
These public references support the explanation and provide further detail. Their graphics and downloadable files remain with their publishers.
AutoCAD Electrical: Motor control and overloads
Public documentation of this equipment function or named vendor variant; the illustration is independently authored and is not the source graphic.
About this graphic
This illustration was authored independently by Elora Grid to explain the concept. It is not reproduced from a customer drawing, an official standard graphic or a manufacturer CAD file. Its correspondence to an exact IEC or IEEE symbol identifier has not been certified.
SVG and DXF downloads contain this original artwork. DXF uses unscaled drawing units; a GA envelope supplies no product dimensions, clearances or fabrication information. Original artwork is available under CC BY 4.0. Third-party references retain their own terms.
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