Crank-operation qualifier

What it represents

This qualifier identifies manual operation through a crank mechanism. A crank supplies manual mechanical movement to a mechanism that may require several turns or a particular travel. Its role is different from a momentary electrical command to a motor drive.

The schematic records the operating method; the equipment instructions describe actual travel and operating procedure. Indicate any separate position switch rather than assuming the crank mark includes feedback.

How to read it

• Document the mechanism being moved and its travel or operating positions.
• A crank-operated mechanism is not automatically a motor-driven mechanism.

Information to show or reference

• Identify the associated device, circuit or diagram boundary.
• Document the mechanism being moved and its travel or operating positions.
• 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