Current Transformers(CT's)

Amps
Core Type

To determine the amount of Amperage Points/CTs needed in your assembly for ever meter point, it will vary on the voltage system.
  • 120V_1ø2 wire voltage systems require 1 CT per meter point (1:1).
  • 120/240V_1ø3 wire and 120/208V_2ø3 wire voltage systems require 2 CTs per meter point (1:2).
  • 120/208V_3ø4 wire, 240/416V_3ø4 wire, 277/480V_3ø4 wire, 347/600V_3ø4 wire, 208V_3ø3 wire, 416V_3ø3 wire, 480V_3ø3wire and 600V_3ø3 wire voltage systems require 3 CTs per meter point (1:3).

Solid Core

The window size varies on the amperage:
Window  Inside Diameter  Outside Diameter Thickness  Lead Length
100:0.1A - 0.5" 0.5"  (12.7 mm) 1.1" x  1.1"  (27.94mm)  0.79"  (20.06mm) 6ft.
200:0.1A - 0.75" 0.75" (19.5mm) 1.9" (48.26mm) 0.68" (17.27mm) 6ft.
400:0.1A - 1.68 1.68" (42.67mm) 2.78" (70.61mm) 0.8" (20.32mm) 6ft.
600:0.1A - 3.75" 3.5" (88.9mm) 4.7" 119.38mm) 0.86" (21.84mm) 6ft.
200:5 - 3/4" 3/4"  (20 mm) 2"  (50mm)  0.6"  (15mm) 2ft.
400:5A - 1 1/2" 1 1/2" (40mm) 3 1/2" (90mm) 0.9" (25mm) 2ft.
600:5A - 3 1/4" 3 1/4" (85mm) 2.78" (70.61mm) 5.6" x 5.6" (14.3mm) NO Leads

Split Core

The window size varies on the amperage:
Window Lead Length
100:0.1A - 0.75" 2ft.
200:0.1A - 0.75" 2ft.
400:0.1A - 1.25" 2ft.

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