Why Choose the ABB CT4/250 Current Transformer?
The ABB CT4/250 is a reliable 250/5 A current transformer designed to convert high primary currents into a proportional secondary current suitable for electrical metering and measurement equipment. Supplied under ABB order code 2CSG221130R1101, it forms part of the ABB CT4 current transformer series and is designed for use in low-voltage electrical distribution and energy monitoring installations.
With a rated primary current of 250 A and a rated secondary current of 5 A, the CT4/250 allows compatible meters and measuring instruments to monitor circuits carrying currents that would otherwise be too high for direct measurement. Its class 0.5 accuracy and 6 VA rated burden make it suitable for accurate electrical measurement applications.
The CT4/250 is suitable for installation around a cable or busbar and accommodates a primary conductor up to 25 mm diameter or a busbar up to 40 × 10 mm. With screw secondary connections, a 50–60 Hz operating frequency and compact construction, it provides a practical current-sensing solution for switchboards, distribution panels and metering systems.
Key Advantages
- Reliable 250/5 A current transformation for electrical metering applications.
- Class 0.5 accuracy supports precise current measurement.
- 6 VA rated burden for compatible measuring instruments.
- Suitable for cable and 40 × 10 mm busbar installations.
- Standard 5 A secondary output for compatible meters and measuring equipment.
- Operates across standard 50–60 Hz electrical systems.
- Screw secondary connections provide secure electrical termination.
- Compact construction simplifies integration into electrical distribution panels.
Key Features
- ABB CT4 current transformer series.
- 250 A rated primary current.
- 5 A rated secondary current.
- 250/5 A transformation ratio.
- Class 0.5 measurement accuracy.
- 6 VA rated burden.
- 50–60 Hz operating frequency.
- IP30 degree of protection.
- Suitable for busbar or cable installation.
- Maximum round conductor diameter of 25 mm.
- Suitable for busbars up to 40 × 10 mm.
Current transformers allow measuring instruments to monitor high-current electrical circuits without carrying the full primary current through the meter itself. The ABB CT4/250 converts a primary current of up to 250 A into a standard 5 A secondary signal, enabling compatible meters, analysers and monitoring equipment to measure circuit current safely and accurately.
The CT4 series is designed for installation in electrical distribution and metering systems where dependable current measurement is required. The CT4/250 combines class 0.5 accuracy with a practical pass-through design for cables and busbars, making it suitable for new switchboard installations as well as upgrades to existing metering systems.
Typical Applications
- Electrical energy metering systems.
- Low-voltage switchboards and distribution panels.
- Power and network monitoring equipment.
- Industrial electrical installations.
- Building energy management systems.
- Panel-mounted ammeters and measuring instruments.
- Current monitoring for busbar circuits.
- Commercial and industrial energy monitoring.
