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

SSO

IEC

Switched socket outlet

A switched socket outlet combines the outlet and a single-pole or double-pole switch in one accessory plate. On the plan the outlet half circle carries a short switch stroke with a tick, borrowed from the light-switch form, showing that the user can interrupt supply at the outlet without removing the plug.

Drawing use: GA
Application: Installation & communications
Reference family: IEC
Form evidence: Switched socket outlet. IEC 60617 installation-plan style (architectural and topographical installation symbols); independently drawn, not certified IEC geometry or a database identifier.

A distinction that matters

A socket outlet with interlocked switch prevents plug insertion or withdrawal while energised; a plain switched outlet only lets the user switch the supply.

Full reference

IEC

Socket outlet with protective earth contact

On an installation plan this mark places a socket outlet whose contact set includes a protective earth pin or earthing clip. The basic half-circle outlet form is completed by a straight bar across the top of the curve, which tells the reader that the outlet connects the protective conductor of the final circuit to the plug.

Drawing use: GA
Application: Installation & communications
Reference family: IEC
Form evidence: Socket outlet with protective contact. IEC 60617 installation-plan style (architectural and topographical installation symbols); independently drawn, not certified IEC geometry or a database identifier.

A distinction that matters

A plain socket-outlet mark shows an outlet position only; the earth bar adds the protective contact. The protective earth terminal symbol itself is a schematic conductor mark, not an outlet.

Full reference

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