PB NC
Normally closed pushbutton
A pushbutton contact normally shown closed before actuation.
Schematic
Symbols · E-stop
Emergency-stop operator
An identified emergency-stop operator and its documented contact arrangement.
Schematic · E-stop
What it represents
An emergency-stop operator is identified by its intended function and the properties of the selected device. A schematic may show its contact blocks, actuator and reset or latching features. The drawing must connect those features to the operator description and the complete control-system design.
This educational preview identifies the concept without specifying a safety circuit. A mushroom actuator, NC contact or stop label alone does not establish the required safety performance. Use the applicable standards, risk assessment and manufacturer information for the actual implementation.
How to read it
- Read the operator identification together with all associated contact blocks.
- Do not infer safety performance from the actuator shape or a single contact mark.
Information to show or reference
- Identify the operator and documented reset mode.
- Reference contact and mechanical characteristics.
- Link the complete control-system documentation.
A distinction that matters
Emergency stop is a system function. A generic mushroom pushbutton depiction does not certify an emergency-stop implementation.
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 mushroom-head, latching and positive-break contact categories.
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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