IEC selector-switch contact: 3 position normally closed key operated neutral 1

What it represents

A rotary selector has discrete handle positions and one or more contact blocks driven by its mechanism. A contact shown as normally open or normally closed describes the stated reference position; it does not give the whole switching table across the remaining positions. This entry identifies the 3 position normally closed key operated neutral 1 form in the publisher's IEC-context family.

For a local/off/remote selector, prepare a contact-versus-position chart alongside the schematic. The chart tells the installer which input is active at each handle setting, while spring-return, maintained and key-operated marks explain how the operator reaches or leaves that setting. The normally-closed designation starts with a conducting output or closed contact in the documented reference condition; operation changes that state. Keep the publisher's neutral 1 designation beside its contact table; do not infer the complete position sequence from that number.

A vendor neutral-position number must be read with that vendor form and the project legend. It does not automatically establish a key-removal position, a contact overlap or an off state. Those details need their own table or equipment reference.

How to read it

• The normally-closed designation starts with a conducting output or closed contact in the documented reference condition; operation changes that state.
• Keep the publisher's neutral 1 designation beside its contact table; do not infer the complete position sequence from that number.
• A vendor neutral-position number must be read with that vendor form and the project legend. It does not automatically establish a key-removal position, a contact overlap or an off state. Those details need their own table or equipment reference.

Information to show or reference

• Label every handle position and preserve its reference orientation.
• Cross-reference a contact-versus-position chart.
• State maintained positions, return directions and any key-removal conditions.

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: 28 October 2026