Carlo Gavazzi CTA5X300A5A is a Class 1 split-core current transformer with a 300 A primary rating, 5 A secondary output, 2.5 VA burden and 24 mm aperture for energy metering and retrofit current measurement applications.
£97.10
The Carlo Gavazzi CTA5X300A5A is a split-core current transformer from the CTA series, designed for accurate AC current measurement in energy monitoring, metering and electrical distribution applications. With a rated primary current of 300 A and a standard 5 A secondary output, it can be connected to compatible energy meters and measuring instruments equipped with 5 A current inputs.
Its split-core construction allows the transformer to be fitted around an existing conductor without disconnecting or removing the cable, making the CTA5X300A5A particularly useful for retrofit installations. The unit provides a 24 mm aperture, Class 1 accuracy and a rated burden of 2.5 VA, delivering dependable measurement performance for commercial and industrial energy-monitoring systems.
Designed for 50–60 Hz electrical systems, the CTA5X300A5A combines compact dimensions with a pre-wired 1 m secondary cable for straightforward installation. Its split-core format provides a practical solution where conventional solid-core current transformers would require existing power conductors to be disconnected during installation.
Split-core current transformers are particularly useful when adding energy measurement to an existing electrical installation. Instead of disconnecting the primary conductor and feeding it through a closed transformer core, the CTA5X300A5A can be opened and installed around the conductor, helping reduce installation work and disruption when retrofitting metering equipment.
The transformer's 300:5 current ratio converts primary currents of up to 300 A into a standard 5 A secondary signal for compatible measurement equipment. This makes the CTA5X300A5A well suited to Carlo Gavazzi energy meters and other metering devices designed to accept conventional 5 A current transformer inputs.
| Current | 5 A |
|---|---|
| Manufacturer | Carlo Gavazzi |
| Series | CTA |
| Model | CTA5X300A5A |
| Product type | Split-core current transformer / current sensor |
| Rated primary current | 300 A |
| Rated secondary current | 5 A |
| Current ratio | 300:5 |
| Accuracy class | Class 1 |
| Rated burden | 2.5 VA |
| Frequency range | 50–60 Hz |
| Hole diameter | 24 mm nominal |
| Secondary cable length | 1 m |
| Construction | Split core |
| Mounting | Cable / conductor mounted |
| Application | Current measurement and energy metering |
| Operating temperature | -20 to +65 °C |
| Weight | Approximately 165 g |
| Protection rating | IP24 |
| Applicable standard | EN 61869-2 |
| Certifications | CE, cURus |
The CTA5X300A5A is a split-core current transformer used to measure AC current for energy meters, monitoring systems and other electrical measuring equipment with compatible 5 A current inputs.
The CTA5X300A5A has a 300:5 current ratio, with a rated primary current of 300 A and a rated secondary output of 5 A.
The Carlo Gavazzi CTA5X300A5A provides Class 1 accuracy and has a rated burden of 2.5 VA.
The current transformer has a nominal 24 mm diameter aperture, allowing it to be installed around a suitably sized electrical conductor.
A split-core current transformer can be opened and fitted around an existing conductor, making it particularly useful for retrofit energy-monitoring installations where disconnecting the existing power cable would be inconvenient.
Carlo Gavazzi CTA split-core current transformers provide convenient retrofit installation and dependable current measurement for energy meters, monitoring equipment and electrical energy-management systems.
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2025 has been a big year for LED Controls, and our blog has expanded accordingly. We've covered a wide range of topics across industrial control and factory automation this year. From core technology explainers and new product releases to panel building best practice...