Why Choose the ABB CT1M-2 400 Current Transformer?
The ABB CT1M-2 400 is a through-primary 400/5 A current transformer designed for indirect measurement of electrical network parameters. Supplied under ABB order code 2CSG280305R1000, it transforms a rated primary current of 400 A into a proportional 5 A secondary current for compatible energy meters, ammeters and multifunction measuring instruments.
Part of ABB's CT1M current-transformer range, the CT1M-2 400 is designed in accordance with IEC 61869-2. It provides a best accuracy class of 0.5, with a rated burden of 5 VA at class 0.5, 5 VA at class 1 and 7.5 VA at class 3, making it suitable for dependable current and energy measurement.
The CT1M-2 format accommodates cables up to 21 mm and horizontal busbars up to 20 × 10 mm. With compact 65 × 45 × 40 mm dimensions, IP20 protection and a 50–60 Hz rated frequency, the CT1M-2 400 is well suited to switchboards, metering panels and electrical distribution systems.
Key Advantages
- 400/5 A transformation ratio for indirect AC current measurement.
- Best measurement accuracy of class 0.5.
- 5 VA rated burden at class 0.5.
- 5 VA rated burden at class 1.
- 7.5 VA rated burden at class 3.
- Standard 5 A secondary output for compatible measuring instruments.
- Accommodates cables up to 21 mm and horizontal busbars up to 20 × 10 mm.
- Designed in accordance with IEC 61869-2.
Key Features
- ABB CT1M-2 series current transformer.
- 400 A rated primary current.
- 5 A rated secondary current.
- 400/5 A current transformation ratio.
- Accuracy class 0.5.
- FS 5 current limiting factor.
- 50–60 Hz rated frequency.
- IP20 protection rating.
- Through-primary design for cable or horizontal busbar installation.
- Busbar and mounting-foot fixings supplied as standard for the CT1M-2 series.
- Optional CT1M-2 DIN rail mounting adapter available.
Reliable Indirect Current Measurement for Metering Systems
Current transformers allow electrical measuring equipment to monitor circuits carrying currents beyond the direct-input capability of the instrument. The ABB CT1M-2 400 converts a rated 400 A primary current into a proportional 5 A secondary current, providing a standardised signal for compatible meters and monitoring devices.
With class 0.5 accuracy at a 5 VA burden, the CT1M-2 400 is suitable for applications requiring dependable current information for metering, energy analysis and load monitoring. Its through-primary design accepts either a cable or horizontal busbar, while an optional DIN rail adapter provides additional installation flexibility.
Typical Applications
- Indirect electrical current measurement up to 400 A.
- Energy meters with 5 A current-transformer inputs.
- Ammeters and multifunction measuring instruments.
- Commercial and industrial switchboards.
- Electrical distribution and metering panels.
- Energy monitoring and load-analysis systems.
