Back to COSI-CT F3 product page Current Transformers specifications

  • Single phase, three phase, and six phase system configurations available
  • Sensor enclosure; fiberglass box;
    • Type A and Type B:
      Dimensions: 14 x 12 x 5.74 inches
      Weight: 20 lbs
      IP66
    • Closed Loop F3:
      Dimensions: 16 x 14 x 5.74 inches
      Weight: 45 lbs
      IP66
  • 20-meter length wrap-around sensing fiber standard, other lengths available on request
  • Programmable output scaling
  • Output format options: analog voltage (IEC 60044-8 200 mV and 4V formats), current (1 A or 5 A metering format), digital (IEC 61850)
COSI-CT F3 Type A Type B Closed Loop
Class .1     x
Class .15s x   x
Class .2s x   x
Class .3 x   x
Class 1   x  
Class 5   x  
AC x
(up to 20 kHz)		 x
(10 Hz to 3 kHz)		 x
(up to 20 kHz)
DC x   x
AC/DC x   x
Sensor box HV isolated   x  
Max distance between
electronics and sensor		 1 km 10 km
(no repeater)		 100 m
Fiber cable required x x x
Copper cables required x   x
Applications
COSI-CT F3 Type A Type B Closed Loop
Bushing x x x
Currents > 160 kA     x
GIS x x  
Calibration     x
Field service x x x
Metering x   x
Protection x x x
Cable monitoring x x  
Rated current range vs. number of fiber wraps
# of fiber wraps Minimum rated current* Max rated current*
1 2000 A 80 kA
2 1000 A 40 kA
5 400 A 16 kA
10 200 A 8 kA
20 100 A 4 kA
*F3 maintains accuracy class from 1% to 200% of rated current.

Back to COSI-CT F3 product page