Carlo Gavazzi CTD5S1255AXXX is a CTD-5S split-core 125/5 A current transformer with Class 1 accuracy, a 5 A secondary output and capacity for cables up to 26 mm or rectangular busbars up to 26 × 32 mm for electrical metering and energy monitoring.
£117.21
The Carlo Gavazzi CTD5S1255AXXX is a reliable split-core current transformer designed for electrical current measurement, energy monitoring and metering applications. As part of the Carlo Gavazzi CTD-5S current transformer series, its split-core construction allows installation around an existing cable or busbar without requiring the primary conductor to be disconnected.
This current transformer provides a 125 A rated primary current and 5 A secondary output, giving a 125/5 A transformation ratio for connection to compatible energy meters, power analysers and electrical monitoring equipment. Its Accuracy Class 1 provides dependable measurement performance for industrial and commercial electrical systems.
The CTD5S1255AXXX accommodates cables up to approximately 26 mm diameter and rectangular busbars up to 26 × 32 mm. Its split-core format and screw-terminal secondary connections make it particularly suitable for retrofit installations in switchboards, distribution panels and control cabinets where existing conductors need to remain in place.
Current transformers such as the Carlo Gavazzi CTD-5S convert the current flowing through a primary conductor into a lower proportional secondary current suitable for compatible measuring instruments. This allows energy meters, power analysers and monitoring systems to measure substantial electrical loads without requiring the full primary circuit current to pass directly through the measuring device.
The split-core construction of the CTD5S1255AXXX makes it particularly useful for retrofit projects. The transformer can be opened and positioned around an existing cable or busbar, helping minimise disruption to established wiring while its 125/5 A ratio provides a standard 5 A secondary signal for compatible industrial metering equipment.
| Manufacturer | Carlo Gavazzi |
|---|---|
| Series | CTD-5S |
| Model | CTD5S1255AXXX |
| Product type | Split-core current transformer |
| Rated primary current | 125 A |
| Rated secondary current | 5 A |
| Transformation ratio | 125/5 A |
| Accuracy class | Class 1 |
| Rated secondary apparent power | 1 VA |
| Overcurrent limiting factor | FS 5 |
| Opening diameter | approx. 26 mm |
| Maximum busbar size | 26 × 32 mm |
| Core type | Split core |
| Secondary connection | Screw terminals |
| Number of primary inputs | 1 |
| Mounting type | Cable / busbar mounting |
The CTD5S1255AXXX is used to convert a 125 A primary current into a proportional 5 A secondary current for compatible electrical meters, power analysers and energy-monitoring equipment.
The current transformer has a 125/5 A transformation ratio, with a rated primary current of 125 A and a rated secondary output of 5 A.
The CTD5S1255AXXX provides Accuracy Class 1, making it suitable for dependable current and energy measurement applications.
The transformer accommodates cables up to approximately 26 mm diameter and rectangular busbars up to 26 × 32 mm.
A split-core current transformer can be opened and fitted around an existing conductor, making it particularly useful for retrofit metering and monitoring installations where disconnecting existing cables or busbars would be inconvenient.
Carlo Gavazzi CTD-5S split-core current transformers provide a practical solution for electrical current measurement and energy monitoring, combining straightforward retrofit installation with dependable integration into industrial and commercial metering 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...