Littelfuse CT SelecTiOn Guide - Manual

Accessories
© May 2012 Littelfuse Protection Relays & Controls www.littelfuse.com/relayct
current Transformers (cTs)
cT SelecTiOn Guide
*Phase CTs should be selected with a primary rating of 100-300% of rated current to maintain specified accuracy. CTs with a 1-A or 5-A secondary are accepted.
†Trip levels are model specific, see ordering information..
‡Select a CT with a primary rating approximately equal to the system’s rated current. CTs with 5-A secondary current are accepted.
PrOducT GrOund-faulT cT
GrOund-faulT TriP leVel
(or insulation level)
SE-601 No CTs required 1-20 mA
PGR-3100 No CTs required Indication only
PGR-3200 No CTs required
Warnings at 30 kΩ & 50 kΩ,
Alarm at 10 kΩ
SE-502 No CTs required 5 ± 0.9 mA
SE-701/SE-703
CT-200 Series 10-198 A
EFCT Series 50 mA-4.95 A
SE-CS30 Series 300 mA-29.7 A
SE-704 SE-CS30 Series 10 mA-5 A
EL731 EFCT Series 30-5,000 mA AC and DC
SE-105/SE-107 CT200 Series 0.5-4 A
SE-134C/SE-135 SE-CS10 Series 0.5-12.5 A
SE-145
SE-CS10 Series 0.5-12.5 A
SE-CS40 Series 2.0-50 A
SE-330
CT200 Series 12-200 A
EFCT Series 100 mA-5 A
SE-CS30 Series 600 mA-30 A
SE-325 CT200 Series 0.5-4 A
PGR-6150
No phase CTs required <25 A,
Optional SE-CS30 Series Ground-Fault CT
0.4-150 A
MPU-32*
CT200 Series 10-200 A
EFCT Series 50 mA-5 A
SE-CS30 Series 300 mA-30 A
MPS*
CT200 10-200 A
EFCT Series (5-A Primary) 50 mA-5 A
SE-CS30 Series (30-A Primary) 300 mA-30 A
MPU-32-X69X-PMA16 Existing CTs can be used or same as MPU-32.
MPS-469X-PMA24 Existing CTs can be used or same as MPS.
PGR-6800 No CTs required <91 A N/A †
FPU-32*
CT200 Series 10-200 A
EFCT Series 50 mA-5 A
SE-CS30 Series 300 mA-30 A
FPS*
CT200 10-200 A
EFCT Series (5-A Primary) 50 mA-5 A
SE-CS30 Series (30-A Primary) 300 mA-30 A
AF1000 ‡ CTs are optional N/A
GROUND F
AUL
T
PROTECTION
TRAILING
CABLE
PROTECTION
RESIST
ANCE
GROUNDING
MOTOR &
PUMP
PROTECTION
FEEDER
PROTECTION
ARC
-FLASH
PROTECTION