GE Entellisys Installation And Maintenance Instructions Manual page 15

All of the primary circuit switching and protective devices,
Entellisys instrumentation, control fuses, and instrument
transformers are mounted in the enclosure. The breaker
compartments include drawout rails, stationary breaker
contacts, interlocks, and EntelliGuard Messengers. The
breakers are provided with self-aligning primary and
secondary disconnect contacts and a breaker mechanism
Fig. 3-2. Outline of a typical Entellisys Load Center Unit Substation
Entellisys Low Voltage Switchgear
locking unit. The individual sections, compartments, and
devices are described in the following paragraphs.
Fig. 3-2 is an outline of a typical single-ended load center
unit substation illustrating the nomenclature used for all
equipment.
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Chapter 3. Description