Why Choose the ABB CT4/100 Current Transformer?
The ABB CT4/100 is a 100/5 A current transformer designed to convert high primary currents into a proportional 5 A secondary current suitable for compatible electrical measuring and metering instruments. Supplied under ABB order code 2CSG221100R1101, it belongs to the ABB CT4 range of metering current transformers.
With a rated primary current of 100 A, a 5 A secondary and accuracy class 1, the CT4/100 provides a practical solution for indirect current measurement in commercial and industrial electrical distribution systems. Its rated measuring burden is 3 VA, supporting dependable measurement when correctly matched with the connected instrument and secondary circuit.
The CT4 construction accommodates installation around a primary cable or busbar, with the range designed for conductors up to approximately 30 mm diameter or busbars around 40 × 10 mm. This makes the CT4/100 suitable for switchboards, metering panels and distribution equipment where direct connection of the measuring instrument to the primary current is impractical.
Key Advantages
- 100/5 A transformation ratio for indirect AC current measurement.
- Accuracy class 1 supports dependable metering and monitoring.
- 3 VA rated measuring burden.
- Standard 5 A secondary output for compatible measuring instruments.
- Suitable for installation around cables or busbars.
- Supports primary cables up to approximately 30 mm diameter.
- Suitable for busbars around 40 × 10 mm.
- ABB-designed metering accessory for professional electrical distribution applications.
Key Features
- ABB CT4 series current transformer.
- 100 A rated primary current.
- 5 A rated secondary current.
- 100/5 A transformation ratio.
- Accuracy class 1.
- 3 VA rated output.
- 50–60 Hz operating frequency.
- IP30 protection rating.
- Suitable for cable and busbar installation.
- Screw secondary connections.
Reliable Indirect Current Measurement for Metering Systems
Current transformers allow measuring instruments to monitor electrical circuits carrying currents above their direct-input capability. The ABB CT4/100 converts a primary current of up to 100 A into a proportional 5 A secondary signal, allowing compatible meters and measuring instruments to obtain current information without carrying the full primary circuit current through the instrument.
Correct current-transformer selection is important for measurement accuracy. The CT4/100 combines a 100/5 A ratio, class 1 accuracy and a 3 VA measuring burden with a through-primary format suitable for cables and busbars, making it a practical choice for electrical metering, load monitoring and energy-management installations.
Typical Applications
- Electrical energy metering systems.
- Indirect current measurement up to 100 A.
- Commercial and industrial switchboards.
- Electrical distribution and metering panels.
- Load and consumption monitoring systems.
- Compatible ammeters, multifunction meters and energy meters with 5 A CT inputs.
