Understand the difference.

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

SBDM

Symbols

Station battery discharge-current measurement

Identifies the measured battery discharge contribution to the station DC load. A station battery system supplies protection, control and other assigned DC loads through a documented charger and distribution arrangement. Charger output, battery contribution and load distribution are related but separately monitored paths.

Drawing use

Schematic

Application

Metering & protection

Reference family

Manufacturer

A distinction that matters

Sensor polarity determines charge versus discharge sign. 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 referenceAdd to legend

SBCM

Symbols

Station battery charge-current measurement

Identifies the battery charging-current measurement used by the assigned supervisory function. A station battery system supplies protection, control and other assigned DC loads through a documented charger and distribution arrangement. Charger output, battery contribution and load distribution are related but separately monitored paths.

Drawing use

Schematic

Application

Metering & protection

Reference family

Manufacturer

A distinction that matters

Charger output current includes connected load where applicable. 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 referenceAdd to legend

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.