TS 632

TS 632 is a standard for graphical symbols used in electrical and technical drawings, focused on switching and protective devices. In practical diagramming, these symbols communicate how a circuit is controlled, isolated, or protected, allowing the function of equipment to be understood at a glance without relying on language-specific labels.

What switching and protective devices mean in practice

Switching devices are the components represented by symbols for turning circuits on or off, or for changing the flow of current through a circuit. Protective devices cover symbols for elements intended to limit fault conditions, interrupt abnormal current, or place a circuit in a safer state. In electrical documentation, these symbols support clear interpretation of equipment function, interconnection, and safety-related purpose across drawings and systems.

Document scope and technical position

The scope identifies this document as the section of the IEC 117-3 based graphical symbol family dealing with switching and protective devices. TS 632 addresses that symbolic domain, but its record status shows that it has been withdrawn and replaced by TS 11330, TS 11331, TS 11332, TS 11333, and TS 11334. It therefore serves as a historically important part of the standardized symbol set and a reference point for the later split into separate documents.

Graphical symbol standards help keep electrical schematics, equipment layouts, and related technical documentation consistent. The same function can then be shown in a common visual language rather than depending on local practice or individual drafting style. TS 632 belongs to that wider family of standards supporting standardized representation for switching and protection functions.

• Covers graphical symbols used in electrical diagrams.
• Focuses on switching and protective device notation.
• Referenced to IEC 117-3.
• Withdrawn and replaced by TS 11330, TS 11331, TS 11332, TS 11333, and TS 11334.