Carlo Gavazzi CTD9S40005AXXX split-core current transformer with a 4000 A primary rating, 5 A secondary output and capacity for busbars up to approximately 125 × 35 mm.
£230.36
The Carlo Gavazzi CTD9S40005AXXX is a high-current split-core AC current transformer (CT) designed for electrical measurement, energy monitoring and power distribution applications. As part of the Carlo Gavazzi CTD9S current transformer series, it converts a rated primary current of 4000 A into a standard 5 A secondary output for connection to compatible energy meters, power analysers and monitoring equipment.
The split-core construction allows the transformer to be opened and installed around an existing conductor or busbar without removing the primary conductor. This makes the CTD9S40005AXXX particularly suitable for retrofit energy-monitoring projects, switchboard upgrades and industrial installations where disconnecting large power conductors would be inconvenient or time-consuming.
With a 4000 A primary current rating, 5 A secondary output and a large 125 × 35 mm busbar capacity, the CTD9S40005AXXX is designed for demanding high-current measurement applications. The CTD9S series combines a compact split-core format with industrial insulation and frequency specifications, making it suitable for large electrical distribution systems and industrial switchboards.
Current transformers such as the Carlo Gavazzi CTD9S40005AXXX proportionally reduce high primary currents to a standard secondary current that can be measured by compatible instrumentation. With a 4000/5 A ratio, a 4000 A primary current corresponds to a 5 A secondary current, allowing meters and monitoring equipment to measure high-current circuits without carrying the full primary load current.
The CTD9S series combines high-current measurement capability with the installation convenience of a split-core design. Because the core can be opened and fitted around an existing conductor or busbar, the CTD9S40005AXXX is particularly suitable for retrofit energy monitoring, electrical distribution upgrades and industrial installations where removing existing conductors would be impractical.
| Manufacturer | Carlo Gavazzi |
|---|---|
| Series | CTD9S |
| Model | CTD9S40005AXXX |
| Product type | Split-core current transformer |
| Rated primary current | 4000 A |
| Rated secondary current | 5 A |
| Current transformation ratio | 4000/5 A (800:1) |
| Operating frequency | 48–62 Hz |
| Maximum system voltage | 0.72 kV |
| Rated insulation level | 3 kV RMS, 50 Hz, 1 min |
| Security factor | ≤5 |
| Busbar size | up to 125 × 35 mm |
| Transformer type | Split-core current transformer |
| Core type | Split core |
| AC system | Single-phase current measurement |
| Dimensions (H × W × D) | approx. 178 × 92 × 40 mm |
The CTD9S40005AXXX is designed for measuring high AC currents in electrical distribution, energy monitoring and industrial systems by converting a rated 4000 A primary current into a proportional 5 A secondary current.
The current transformer has a rated ratio of 4000/5 A, equivalent to a transformation ratio of 800:1.
The CTD9S series is designed to accommodate busbars up to approximately 125 × 35 mm, making it suitable for substantial conductors in high-current electrical distribution systems.
The CTD9S series is designed for an operating frequency of 48–62 Hz, covering standard 50 Hz and 60 Hz AC electrical systems.
A split-core current transformer can be opened and installed around an existing conductor or busbar without removing the conductor, making the CTD9S40005AXXX particularly convenient for retrofit energy monitoring and electrical system upgrades.
Carlo Gavazzi CTD9S split-core current transformers provide practical high-current measurement for industrial installers, panel builders and energy-management professionals, combining retrofit-friendly installation with compatibility for standard electrical metering systems.
● Service Agreements
Credit Accounts
Our service agreements are built to support long term procurement relationships. By working closely with engineering teams and procurement departments, we help streamline purchasing processes while ensuring consistent access to critical components and sourcing support when it matters most.
● frequently asked questions
At Led Controls Ltd we help engineers source the right automation and control gear with confidence. below are quick answers to what we are asked most often.
We supply all leading manfacturers in our industry. we offer next day delivery on most poplour products.
Your content goes here. Edit or remove this text inline or in the module Content settings. You can also style every aspect of this content in the module Design settings and even apply custom CSS to this text in the module Advanced settings.
Your content goes here. Edit or remove this text inline or in the module Content settings. You can also style every aspect of this content in the module Design settings and even apply custom CSS to this text in the module Advanced settings.
Your content goes here. Edit or remove this text inline or in the module Content settings. You can also style every aspect of this content in the module Design settings and even apply custom CSS to this text in the module Advanced settings.
Your content goes here. Edit or remove this text inline or in the module Content settings. You can also style every aspect of this content in the module Design settings and even apply custom CSS to this text in the module Advanced settings.
● latest blog
LED Controls is a specialist distributor of factory automation and industrial controls, supplying OEMs, machine builders, panel builders and end users throughout the UK and worldwide. As a trusted UK distributor for many of the world’s leading automation manufacturers, we provide industrial control products, technical expertise and bespoke automation solutions backed by outstanding customer service.
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...
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...