Carlo Gavazzi CTD9S12505AXXX split-core current transformer with a 1250 A primary rating, 5 A secondary output, class 1 accuracy and capacity for busbars up to approximately 125 × 35 mm.
£157.78
The Carlo Gavazzi CTD9S12505AXXX is a reliable split-core AC current transformer (CT) designed for accurate measurement of high currents in industrial electrical installations, energy monitoring systems and distribution panels. As part of the Carlo Gavazzi CTD9S current transformer series, it converts a rated primary current of 1250 A into a standard 5 A secondary output for connection to compatible 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 CTD9S12505AXXX particularly suitable for retrofit energy-monitoring projects, switchboard upgrades and industrial installations where disconnecting large power conductors would be inconvenient.
With a 1250 A primary current rating, 5 A secondary output and accuracy class 1, the CTD9S12505AXXX provides dependable current measurement for demanding applications. Its rectangular opening of approximately 126 × 36 mm accommodates busbars up to approximately 125 × 35 mm, making it well suited to high-current distribution systems and large industrial switchboards.
Current transformers such as the Carlo Gavazzi CTD9S12505AXXX proportionally reduce high primary currents to a standard secondary current that can be measured by compatible instrumentation. With a 1250/5 A ratio, a 1250 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 CTD9S12505AXXX 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 | CTD9S12505AXXX |
| Product type | Split-core current transformer |
| Rated primary current | 1250 A |
| Rated secondary current | 5 A |
| Current transformation ratio | 1250/5 A (250:1) |
| Accuracy class | 1 |
| Rated secondary apparent power, class 1 | 8 VA |
| Rated secondary apparent power, class 3 | 12 VA |
| Operating frequency | 48–62 Hz |
| Maximum system voltage | 0.72 kV |
| Rated insulation level | 3 kV RMS, 50 Hz, 1 min |
| Overcurrent limiting factor | FS 5 |
| Primary inputs | 1 |
| Rectangular opening | approx. 126 × 36 mm |
| Maximum busbar size | approx. 125 × 35 mm |
| Transformer type | Split-core / through-feed current transformer |
| Core type | Split core |
| Secondary connection | Double screw terminals |
| Mounting options | DIN rail / panel / busbar |
| Dimensions (H × W × D) | approx. 177.9 × 91.7 × 40 mm |
The CTD9S12505AXXX is used to measure high AC currents in electrical distribution, energy monitoring and industrial control systems by converting a rated 1250 A primary current into a proportional 5 A secondary current.
The current transformer has a rated ratio of 1250/5 A, equivalent to a transformation ratio of 250:1.
The CTD9S12505AXXX has an accuracy class of 1 with a rated secondary apparent power of 8 VA at this accuracy class, providing dependable measurement for industrial metering and energy-monitoring applications.
The CTD9S12505AXXX has a rectangular opening of approximately 126 × 36 mm and is suitable for busbars up to approximately 125 × 35 mm.
A split-core current transformer can be opened and installed around an existing conductor or busbar without removing the conductor, making the CTD9S12505AXXX particularly convenient for retrofit energy monitoring and electrical system upgrades.
Carlo Gavazzi CTD9S split-core current transformers provide dependable current measurement for industrial installers, panel builders and energy-management professionals, combining practical retrofit installation with reliable measurement for commercial and industrial power systems.
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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...