Circuit-breaker function qualifier

What it represents

A breaker-function qualifier identifies automatic interruption capability in the compound representation. The function element helps distinguish a breaker from other mechanically similar switching representations. Its associated protection may be shown as integrated releases or through a separately documented relay/trip circuit.

Record the breaker and trip interfaces consistently between the SLD and schematic. The function qualifier cannot replace the trip-unit or protection schedule.

How to read it

• Identify the actual trip functions and device schedule separately.
• The qualifier does not specify thermal, magnetic or electronic trip details.

Information to show or reference

• Identify the associated device, circuit or diagram boundary.
• Identify the actual trip functions and device schedule separately.
• Cross-reference the equipment data, terminal mapping or operating-state legend needed to interpret the form.

Sources you can follow

These public references support the explanation and provide further detail. Their graphics and downloadable files remain with their publishers.

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.

Entry JSON · Entry Markdown · Last editorial update: 14 October 2026