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

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

SLVR

Symbols

Switchroom low-temperature ventilation restraint

Restrains the specified ventilation action when the room reaches its defined low-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

Restraint must follow the room-services strategy. 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.