Side-by-side reference

Understand the difference.

Compare the meaning, drawing context and source references of two entries. A similar graphic or shared abbreviation does not establish equivalence.

First referenceCompare with

KEY SEL 3

Symbols

Three-position key selector

A three-position key selector combines position selection with a key-operated mechanism. Stable positions, return behaviour and key-removal conditions are all required for a complete control description.

Drawing use: Schematic
Application: Control circuits
Reference family: IEC / Manufacturer

A distinction that matters

Key operation adds access control to a selector; it does not change its electrical contact ratings.

Full reference

Symbols

Selector switch

A selector switch provides a choice between operating positions such as local and remote or manual and automatic. Its contacts may be shown separately from the operator symbol. The contact truth table or switching schedule defines which contacts operate in each position.

Drawing use: Schematic
Application: Control circuits
Reference family: IEC / IEEE / ANSI

A distinction that matters

A changeover contact describes connections; a selector switch also includes an operator and its position behaviour.

Full reference

Original educational previews. Follow the source references on each full entry for the appropriate standard or selected product.