Vanguard MCCB-250 - Manual (Page 15)

REV 2 MCCB-250 USER’S MANUAL
12
3.2 Measuring Current Transformer Primary and Secondary Currents
Figure 4 shows a typical connection of the MCCB-250 to a current transformer. In this
configuration, the MCCB-250 injects a test current through the CT primary. The CT secondary
current is sensed by the MCCB-250’s
[EXT CURRENT] input.
Figure 4. Typical Current Transformer Current Ratio Test Connections