PB NC
Normally closed pushbutton
A pushbutton contact normally shown closed before actuation.
Schematic
Symbols · PB NO
Normally open pushbutton
A pushbutton contact normally shown open before actuation.
Schematic · PB NO
What it represents
A normally open pushbutton combines an operator-actuated mechanism with a contact shown open in its defined normal state. Momentary and maintained or latching operation are separate characteristics that must be described explicitly.
Control schematics should identify both the contact function and the operator-facing purpose. A start label is a circuit-specific use, not an intrinsic property of every NO pushbutton. Multiple contact blocks can belong to a single actuator.
How to read it
- Read the actuator description and contact-block association.
- Check whether the operating mode is momentary, maintained or latching.
Information to show or reference
- Identify the actuator and contact terminals.
- State the intended operating mode.
- Link additional contact blocks to the same operator device.
A distinction that matters
A NO contact symbol by itself does not identify the pushbutton actuator or its mechanical operating mode.
Sources you can follow
These public references support the explanation and provide further detail. Their graphics and downloadable files remain with their publishers.
Pushbutton contact and actuator variants
Public NO pushbutton and operating-mode variants.
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.
Explore related references
Put the reference into a drawing workflow.
Elora Grid helps electrical teams work with drawings, specifications and equipment information. Explore the drafting workflow or join the early-access waitlist.