As electric vehicle charging becomes more common, accurate current monitoring plays an important role in dynamic load balancing, solar charging and energy management.
A split core current transformer (CT) measures AC current without disconnecting the existing conductor, making it suitable for EV charging installations and retrofit projects.
Jiangyin Spark Electronic Technology Co., Ltd. has manufactured current transformers since 1995. We offer compact split core CTs with customizable current ratings, output signals, cable lengths and connectors for EV charging equipment manufacturers.
In smart EV charging systems, CT clamps can help monitor the electrical load of a home or commercial building.
The current measurement can be used by a compatible controller to:
Support dynamic load balancing
Monitor household or building electricity consumption
Support solar surplus charging
Help prevent electrical supply overload
Provide current data for energy management systems
The CT provides the current measurement signal, while the EV charger or its controller processes the data and adjusts charging accordingly.
The correct CT rating depends on the electrical installation, maximum expected current and charger controller requirements.
For example:
Current Measurement Requirement | Suggested CT Series | Window Size |
|---|---|---|
1A–80A | XH-SCT-T10 | 10mm |
1A -100A | XH-SCT-T16 | 16mm |
1A–300A | XH-SCT-T24 | 24mm |
1A–600A | XH-SCT-T36 | 36mm |
1A–1000A | XH-SCT-T50 | 50mm |
These are general selection guidelines. The final current rating should be matched to the electrical system and measurement requirements.
EV charging manufacturers use different current sensing interfaces.
Common CT output options include:
333mV Output
Suitable for controllers and energy monitoring devices designed for 333mV voltage-output CTs.
mA Output
Current-output CTs such as 100A/100mA,100A/50mA, 100A/40mA ,100A/33.33mA ,100A/20mA, or customized ratios can be supplied according to the controller input requirements.
1A or 5A Output
These are commonly used with compatible energy meters and industrial power monitoring equipment.
The CT output must match the input specification of the EV charger controller or metering device.
The CT window must be large enough to fit around the insulated conductor.
For compact EV charging installations, smaller CTs such as the XH-SCT-T10 or XH-SCT-T16 can be useful when installation space is limited.
Larger split core CTs are available for thicker cables and higher-current applications.
Single-phase EV charging installations commonly use one CT to monitor the relevant supply conductor.
Three-phase installations may require three CTs to monitor L1, L2 and L3 individually.
Some applications may also require neutral current monitoring. The number of CTs depends on the system design and controller requirements.
A conventional split core CT normally provides an analog current or voltage signal, not an RS485 digital communication output.
For systems requiring RS485 communication, the CT can be connected to a compatible energy meter or current measurement module supporting RS485/Modbus RTU.
The meter or module then transmits the measurement data to the EV charging controller or gateway.
Jiangyin Spark supports OEM current transformer customization, including:
Primary current ratings and transformation ratios
mA and voltage output options
Window sizes and housing dimensions
Cable lengths and connector types
Accuracy requirements subject to model specifications
Sample development and batch production
Our split core current transformers are suitable for evaluation in EV charging, energy monitoring and smart power management projects.
Looking for a current transformer for your EV charging system?
Please share your required current rating, CT output, cable diameter, lead length, connector type and estimated quantity.
We can recommend suitable CT models and provide datasheets, samples and quotations.
Contact: Kelly Jian
Email: kelly@xh-dianzi.com
Website: https://www.xhdzct.com
