Why Choose the ABB CT1M-6 250 Current Transformer?
The ABB CT1M-6 250 is a through-primary 250/5 A current transformer designed for indirect measurement of electrical network parameters. Supplied under ABB order code 2CSG280415R1000, it converts a rated primary current of 250 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-6 250 is designed in accordance with IEC 61869-2. It provides a best accuracy class of 0.5, with rated burdens of 1.5 VA at class 0.5, 2.5 VA at class 1 and 3.75 VA at class 3, providing a versatile measurement solution for commercial and industrial electrical systems.
The CT1M-6 frame provides a generous through-primary aperture, accommodating cables up to 65 mm diameter and horizontal or vertical busbars up to 80 × 10 mm, 60 × 30 mm or 50 × 50 mm. With 126 × 104 × 45 mm dimensions, IP20 protection and a rated frequency of 50–60 Hz, it is suitable for switchboards and metering assemblies requiring flexible conductor accommodation.
Key Advantages
- 250/5 A transformation ratio for indirect AC current measurement.
- Best measurement accuracy of class 0.5.
- 1.5 VA rated burden at class 0.5.
- 2.5 VA rated burden at class 1.
- 3.75 VA rated burden at class 3.
- Standard 5 A secondary output for compatible electrical measuring instruments.
- Large through-primary opening accommodates substantial cables and busbars.
- Busbar and mounting-foot fixings are supplied as standard.
- Optional DIN rail mounting adapter provides additional installation flexibility.
- Designed in accordance with IEC 61869-2.
Key Features
- ABB CT1M-6 series current transformer.
- 250 A rated primary current.
- 5 A rated secondary current.
- 250/5 A transformation ratio.
- Accuracy class 0.5.
- 50–60 Hz rated frequency.
- IP20 protection rating.
- Through-primary current-transformer construction.
- Maximum cable diameter of 65 mm.
- Suitable for horizontal and vertical busbars up to 80 × 10 mm, 60 × 30 mm or 50 × 50 mm.
- Compact 126 × 104 × 45 mm enclosure for its conductor capacity.
Reliable Indirect Current Measurement for Metering Systems
Current transformers enable electrical meters and measuring instruments to monitor circuits carrying currents beyond their direct-input capability. The ABB CT1M-6 250 converts a rated 250 A primary current into a proportional 5 A secondary current, providing a standardised signal for compatible electrical metering and monitoring equipment.
With class 0.5 accuracy available at a 1.5 VA burden, the CT1M-6 250 supports dependable current and energy measurement. Its unusually generous conductor opening for a 250 A transformer makes it particularly useful where large cables or busbars must pass through the CT, while supplied busbar and mounting-foot fixings simplify integration into electrical distribution assemblies.
Typical Applications
- Indirect electrical current measurement up to 250 A.
- Energy meters with 5 A current-transformer inputs.
- Ammeters and multifunction electrical measuring instruments.
- Commercial and industrial switchboards.
- Electrical distribution and metering panels.
- Large-cable and busbar metering installations.
- Energy monitoring and load-analysis systems.
