Understand the difference.

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

CB ETU

Symbols

Circuit breaker with electronic trip unit

A breaker electronic trip unit measures current and applies configured protection functions. A functional tag should link the breaker to its selected trip unit, sensors and settings record.

Drawing use

SLD / Schematic

Application

Power distribution

Reference family

IEC / Manufacturer

A distinction that matters

The electronic trip unit is part of breaker protection; a remote protection relay is a separate device unless the design documents otherwise.

Full referenceAdd to legend

CB

Symbols

Circuit breaker

A circuit-breaker representation identifies a device capable of interrupting its circuit under the operating conditions for which it is rated. The drawing should connect that device to its equipment identification, protection arrangement and control information. The graphical mark alone does not establish the current rating, breaking capacity or trip settings.

Drawing use

SLD / Schematic

Application

Power distribution

Reference family

IEC / IEEE / ANSI

A distinction that matters

A disconnector provides isolation; it is not automatically a fault-interrupting circuit breaker. Check published device capabilities.

Full referenceAdd to legend

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