A: APPENDIX
469 MOTOR MANAGEMENT RELAY – INSTRUCTION MANUAL A–7
A.3.2 Ground Fault CTs for 5 A Secondary CT
For low resistance or solidly grounded systems, a 5 A secondary CT should be used. Two
sizes are available with 5½” or 13” × 16” windows. Various Primary amp CTs can be chosen
(50 to 250).
A.3.3 Phase CTs
Current transformers in most common ratios from 50:5 to 1000:5 are available for use as
phase current inputs with motor protection relays. These come with mounting hardware
and are also available with 1 A secondaries. Voltage class: 600 V BIL 10 kV.
808709A1.CDR
GCT5
GCT16
DIMENSIONS
DIMENSIONS
C
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