GE Industrial Solutions Entellisys 5.0 User Manual - Manual (Page 17)

System components 17
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1.3.3 Current transformers
Current transformers (CTs) are sensors that measure current. Each circuit breaker requires input
from three CTs (one per phase) and an optional neutral CT. Unlike traditional switchgear, this
single set of CTs provides the necessary current sensing for all needs including protection,
metering, and control.
The CTs are attached to the power bus behind the circuit breaker in the circuit breaker
compartment. Only Entellisys CTs may be used with the Entellisys system.
CTs either come in a 3-pack (shown in Figure 1-5) or as single CTs.
Figure 1-5 CT 3-pack