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    Current Transformer, 10/5A, 20/5A, 40/5A to 75/5A

    5 out of 5 based on 2 reviews | Write a review
    Current transformer current ratio can select 10/5A, 25/5A, 50/5A and 75/5A, accuracy classes can choose 0.5s, 0.2, 0.2s, rated frequency 50 Hz/60Hz, low cost and manufacturer direct sale.
    SKU: ATO-CT-30I
    30-day Returns
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    Delivery date: 6-12 days

    Cheap price AC current transformer with light weight, low price, fast response, high accuracy and good stability. The current ratio 10:5A,  25:5A, 30:5A and 75:5A are optional.

    Note: The installation method of current transformer can be fixed by busbar and fixed by the bottom plate, suitable for installation in any direction. The primary conductor can be busbar or cable.


    Model ATO-CT-30I
    Weight 1kg
    Current Ratio (A) VA Secondary load/ Burden (VA) Cross-core Turn Number
    0.2 0.5S 0.2S
    10/5 2.5 1.5 1.5 15
    15/5 2.5 1.5 1.5 10
    20/5 2.5 1.5 1.5 8
    25/5 2.5 1.5 1.5 6
    30/5 2.5 1.5 1.5 5
    40/5 2.5 1.5 1.5 4
    50/5 2.5 1.5 1.5 3
    75/5 2.5 1.5 1.5 2
    Rated Frequency 50/60Hz
    Rated Test Voltage 3kV AC (1min)
    Rated Short-Time Thermal Current (ith) 60 in
    Rated Dynamic Current (idyn) 2.5 lth
    Rated Voltage (Um) 0.66 kV AC
    Continuous Overload (ld) 1.2 in
    Operating Temperature -10℃~50℃
    Housing Self-Extinguishing Class VO
    Safety Factor FS 5
    Secondary Current 5A/ 1A
    Bus Specification (mm)/Number /

    Dimension (unit: mm)

    Current transformer dimension

    Model Dimensions Perforation size Installation size
    W H D a e φ M N
    ATO-CT-30I 62 78 45 32 11 22 40 57.5
    ATO-CT-3030I 85 102 50 32 11 28  / 57.5
    ATO-CT-40I 75 95 45 42 11 31 40 57.5
    ATO-CT-60I 102 130 45 61.5 21 45 42 57.5
    ATO-CT-60II 102 125 45 31 33 / 42 57.5
    ATO-CT-80I 118 140 45 82 11 52 60 57.5
    ATO-CT-100II 145 125 45 103 35 / 80 57.5

    Tips: How to Prevent Current Transformer Burning up?

    • Add a watchdog breaker and avoid the power failure of whole feeder line caused by faults on branches, particularly, ensure that the branch breaker can trip correctly in case of single-phase grounding at the user side.
    • Connect the metering current transformer downstream the breaker, so as to guarantee that the breaker and lightning arrester operate correctly to remove faults when the transformer breaks down.
    • Strengthen the flashing test for user’s high voltage metering current transformer and lightning arrester (it shall not be more than 4 years according to regulations), find out the aging degree of current transformer and lightning arrester insulation as early as possible, replace timely to avoid power failure caused by burning out of metering current transformer.
    • Clean the user primary device regularly to reduce the occurrence of flashover, avoid insulation reduction.
    Existing reviews of Current Transformer, 10/5A, 20/5A, 40/5A to 75/5A
    Cool CT
    I'm sure this is a cool CT, the price is very cheap, buy a few'll always get, and measure my generator power, ATO current transformer did a great job!
    From: Karl | Date: 04/02/2020
    Was this review helpful? Yes No (0/0)
    Good frequency response
    I am using to monitor a well pump current draw. Devices installed easily and perform well. Good frequency response aided in identifying the various loads. I am very satisfied with this current transformer.
    From: Thomas | Date: 27/09/2018
    Was this review helpful? Yes No (1/0)
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    Current Transformer, 30/5A, 75/5A, 100/5A to 400/5A

    SKU: ATO-CT-3030I
    Low cost CT transformer rated frequency 50Hz and 60Hz are optional, current ratio can be 30/5A, 75/5A, 100/5A, 200/5A and 400/5A, accuracy classes can be selected. AC current transformer with high accuracy, fast response and light weight.