Isolation-function qualifier

What it represents

An isolation qualifier identifies the documented disconnector function attached to a switching representation. Isolation is a device function that must be distinguished from the ability to interrupt load current or clear faults. A switching representation can therefore carry an isolation qualifier alongside other functional information.

On an SLD, keep the associated device identity and switching function readable. The selected equipment data establishes the actual isolation and operating requirements.

How to read it

• Distinguish isolation capability from load interruption and automatic tripping.
• The qualifier does not give isolation clearances or an equipment rating.

Information to show or reference

• Identify the associated device, circuit or diagram boundary.
• Distinguish isolation capability from load interruption and automatic tripping.
• 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