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

VSCI

Symbols

Ventilation shutdown cause indication

Identifies the initiating control condition that stopped the monitored ventilation function. Ventilation control coordinates the equipment that manages heat and air movement in an electrical room. A temperature request, a fan command and proof of airflow are separate signals, and the room design determines how they interact.

Drawing use: Schematic
Application: Installation & communications
Reference family: Manufacturer

A distinction that matters

Fire response requires a separate coordinated design. This reference describes the named application; it does not establish a new IEC graphical symbol, an ANSI device-function number or an exact manufacturer connection diagram.

Full reference

SHVD

Symbols

Switchroom high-temperature ventilation demand

Generates a ventilation request from the monitored room-temperature condition. Ventilation control coordinates the equipment that manages heat and air movement in an electrical room. A temperature request, a fan command and proof of airflow are separate signals, and the room design determines how they interact.

Drawing use: Schematic
Application: Installation & communications
Reference family: Manufacturer

A distinction that matters

Thresholds belong to the thermal design. This reference describes the named application; it does not establish a new IEC graphical symbol, an ANSI device-function number or an exact manufacturer connection diagram.

Full reference

Follow the full entry for source drawings and the appropriate standard or selected product. Equipment previews show a manufacturer drawing where available, otherwise a 3D thumbnail.