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.
Specification:
Model | CHN-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)

Model | Dimensions | Perforation size | Installation size |
W | H | D | a | e | φ | M | N |
CHN-CT-30I | 62 | 78 | 45 | 32 | 11 | 22 | 40 | 57.5 |
CHN-CT-3030I | 85 | 102 | 50 | 32 | 11 | 28 | / | 57.5 |
CHN-CT-40I | 75 | 95 | 45 | 42 | 11 | 31 | 40 | 57.5 |
CHN-CT-60I | 102 | 130 | 45 | 61.5 | 21 | 45 | 42 | 57.5 |
CHN-CT-60II | 102 | 125 | 45 | 31 | 33 | / | 42 | 57.5 |
CHN-CT-80I | 118 | 140 | 45 | 82 | 11 | 52 | 60 | 57.5 |
CHN-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.
Current transformer current ratio can select 10/5A, 25/5A, 50/5A and 70/5A, accuracy classes can choose 0.5s, 0.2, 0.2s, rated frequency 50 Hz/60Hz, low cost and manufacturer direct sale.