Mounting instruction

No required special tools to install Split-core CT, JS series. To connect Split-core CT to the meter correctly, Please refer to the followings.


- Make sure that safe & proper working circumstance to install Split-core CT.

- Find the correct direction of the power flow. The primary current of conductor should be passed to P1 at first. For the correct mounting, please refer to the label attached (P1 P2) and the installation picture.

- Use the cable ties for fixing Split-core CT to prevent the moving from the conductor. (installation picture)

- Connect the secondary leads to the meter. The secondary current from Split-core CT should be flowed to the meter through S1.

- Close Split-core CT after checking if the installation is made firmly. You can hear ‘click’ if CT has been closed completely.


- Before closing Split-core CT, please re-check the complete connection of CT and the meter.
It is possible to damage the meter by the instantaneous overvoltage from the secondary leads.
Even though overvoltage protection circuit is built in Split-core CT inside, however, it recommend to close CT after connecting it to the meter for safety.

- To measure precisely, it is recommendable to use as secondary leads of AWG18 twisted wire with a short distance from a meter as possible as you can.

Precautions for the Warranty of Quality

- Split-core CT must be handled with care. A damage caused from the careless handling will not be covered by warranty.

- The product is designed to meet operating environments defined by the industrial standard IP20.

- Be careful to install the product with the correct polarity.

- Do not install the product if an application exceed the specifications of the product.

- Recommended to use the terminals specified by J&D.

Check Point for the Accurate Measurement

- Ptotection circuit bulit in inside of the product for user safety.
An additional external protection circuit would be impacted on the feature.

- The product is designed for measuring sinusoidal 50/60Hz of primary current.
Be aware that it is possible to occur the significant error if it is used to measure non-sinusoidal.

- Use Split-core CT with proper diameter to fit the conductor, otherwise it may cause the ratio error and the
phase shift. Be careful to install Split-core CT without any pollutions on the core surfaces.
The pollutions such as moisture, dust and rusty can be caused the error.

- After removing the pollutions, recommended to use WD-40 or CRC5-56 on the core surfaces.
Check whether the secondary leads is connected correctly or not.

- If the connection is not correctly, the secondary output could be lower than the expected one.

Remarks for the Customized Products

- Please provide the technical requirements for a technical evaluation.

- The color of housing is changeable upon the customer’s requirements.

- The leads can be mounted on the terminals by J&D.

- A protective tailor-made housing is available