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.
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
