Why Choose the ABB CT1M-S-120 1200 Current Transformer?
The ABB CT1M-S-120 1200 is a high-capacity 1200/5 A current transformer designed for indirect measurement of electrical current in low-voltage metering and energy-monitoring systems. As part of the ABB CT1M current transformer series, it transforms high primary currents into a standardised 5 A secondary current suitable for connection to compatible meters and electrical measuring instruments.
Designed in accordance with IEC 61869-2, the CT1M-S-120 1200 provides a best accuracy class of 0.5 and an FS 10 current limit function for dependable metering applications. Its through-primary construction is designed for large vertical busbars, making it suitable for main distribution switchboards, industrial panels and energy-monitoring installations.
With a rated primary current of 1200 A, rated secondary current of 5 A and rated frequency of 50–60 Hz, the CT1M-S-120 1200 provides rated outputs of 15 VA at Class 0.5, 30 VA at Class 1 and 45 VA at Class 3. The CT1M-S-120 format accommodates a vertical busbar section up to 125 × 85 mm, providing generous conductor clearance for high-current distribution applications.
Key Advantages
- Reliable 1200/5 A current transformation for indirect electrical measurement.
- Best accuracy class 0.5 for precise metering applications.
- 15 VA rated output at Class 0.5.
- Designed in accordance with IEC 61869-2.
- FS 10 current limit function for metering applications.
- Through-primary design suitable for large vertical busbar installations.
- Large opening accommodates a vertical busbar section up to 125 × 85 mm.
Key Features
- ABB CT1M-S-120 current transformer series.
- 1200 A rated primary current.
- 5 A rated secondary current.
- 1200/5 A transformation ratio.
- Accuracy class 0.5 with 15 VA rated output.
- 30 VA rated output at Class 1.
- 45 VA rated output at Class 3.
- 50–60 Hz rated frequency.
- FS 10 current limit function.
- IP20 protection rating.
- Through-primary construction for indirect electrical measurement.
Reliable Current Measurement for High-Current Distribution
Current transformers allow measuring equipment to monitor high electrical currents without routing the full primary current directly through the measuring instrument. The ABB CT1M-S-120 1200 converts a 1200 A primary current proportionally to a standard 5 A secondary signal, enabling compatible ammeters, multifunction meters and energy meters to perform indirect electrical measurement.
The CT1M range is designed for electrical distribution and energy-efficiency applications where accurate and dependable current measurement is required. The CT1M-S-120 through-primary format provides a large opening for substantial vertical busbars, while its defined accuracy classes and VA ratings allow the transformer to be matched appropriately to compatible metering circuits.
Typical Applications
- High-current electrical energy metering systems.
- Main low-voltage distribution switchboards.
- Industrial electrical distribution panels.
- Indirect current measurement with ammeters.
- Multifunction electrical measuring instruments.
- Energy monitoring and management systems.
- Commercial and industrial busbar installations.
