Current Transformer Indoor Toroidal CT Series

Features

  • Toroidal design.
  • Supplied with 24" insulated secondary leads, terminated with crimped ring connectors.
  • Suitable for use with bare (uninsulated) primary conductor in circuits up to 600 V (4 KV Hi pot); or at higher voltages when a suitably insulated conductor is used.
  • All units have 5 A secondary for use with standard AC ammeters with 5 A movements.
  • Two hole mounting bracket on all models.

Application Data

To obtain current measurement:

  1. Pass the wire carrying the current to be measured through the window of the CT transformer (acting as a primary winding).
  2. Connect the CT secondary to an ammeter with a 5 A movement.

For higher accuracy or higher VA burden rating:

  1. Choose a CT with a primary which is a multiple of the required primary rating and which has the accuracy or VA burden you require.
  2. Loop the wire carrying the current to be measured through the window a number of times equal to the multiple. This "winding" will reduce the ratio back to required primary rating.
    • Example "A": To obtain an accuracy of 1.2% at 10VA burden with a ratio of 100:5, use a CT400 and loop 4 primary turns through the window.
    • Example "B": To obtain a 25:5 ratio, use a CT75 with 3 primary turns to yield 2% accuracy or a CT50 with 2 primary turns to yield 3.2% accuracy.

Units shown: inch. Switch units to: mm

Part No. Current Ratio Accuracy Burden Overall Dimensions Mounting Slots Ship Wt.
Pri. / Sec. % VA A B C D E F G H Lb.
CT50A 50:5 3.2 2 3.75 1.75 3.25 3.00 0.87 2.87 0.22 0.37 1.3
CT60A 60:5 2.4 2 3.75 1.75 3.25 3.00 0.87 2.87 0.22 0.37 1.4
CT75A 75:5 2 2 3.75 1.75 3.25 3.00 0.87 2.87 0.22 0.37 1.5
CT100A 100:5 2 2 3.75 1.75 3.25 3.00 1.20 2.87 0.22 0.37 1.1
CT150A 150:5 1.2 2 3.75 1.75 3.25 3.00 1.20 2.87 0.22 0.37 1.4
CT200A 200:5 1.2 2 4.75 1.75 4.25 4.00 2.20 3.87 0.22 0.37 1.7
CT250A 250:5 0.6 - 1.2 2 - 5 4.75 1.75 4.25 4.00 2.20 3.87 0.22 0.37 1.7
CT300A 300:5 0.6 - 1.2 2 - 10 4.75 1.75 4.25 4.00 2.20 3.87 0.22 0.37 1.8
CT400A 400:5 0.6 - 1.2 2 - 10 4.75 1.75 4.25 4.00 2.20 3.87 0.22 0.37 1.8
CT500A 500:5 0.3 - 1.2 2 - 20 4.75 1.75 4.25 4.00 2.20 3.87 0.22 0.37 1.8
CT600A 600:5 0.3 - 1.2 2 - 20 6.00 1.75 5.25 5.25 3.50 5.12 0.28 0.37 2.5
CT800A 800:5 0.3 - 1.2 5 - 50 6.00 1.75 5.25 5.25 3.50 5.12 0.28 0.37 2.8
CT1000A 1000:5 0.3 - 1.2 5 - 50 7.00 1.75 6.25 6.25 4.50 6.12 0.28 0.37 3.3
CT1200A 1200:5 0.3 - 1.2 10 - 50 8.00 1.75 7.25 7.25 5.50 7.12 0.28 0.37 3.8

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Data subject to change without notice.