2CSG280285R1000 ABB CT1M-2 250 Current Transformer 250 A/5 A

Why Choose the ABB CT1M-2 250 Current Transformer?

The ABB CT1M-2 250, order code 2CSG280285R1000, is a compact 250 A/5 A solid-core current transformer designed for indirect measurement of electrical parameters in metering, monitoring and energy management applications. Part of ABB's Metering Accessories range, it converts higher primary currents into a standardised 5 A secondary current for compatible electricity meters, network analysers and measuring instruments.

As part of the ABB CT1M current transformer series, the CT1M-2 250 is designed according to IEC 61869-2 and uses a solid-core through-primary construction. The monitored conductor passes through the transformer aperture, providing a straightforward current sensing solution for electrical distribution panels, switchboards and energy monitoring systems.

With a 250 A rated primary current, 5 A rated secondary current and accuracy class 0.5, the CT1M-2 250 provides a 250:5 transformation ratio for accurate indirect electrical measurement. It provides a rated output of 5 VA at class 0.5, 5 VA at class 1 and 7.5 VA at class 3, operates at 50–60 Hz and features an IP20 protection rating.

Key Advantages

• Compact current transformer designed for indirect electrical measurement.
• 250 A/5 A current ratio for compatible metering and monitoring equipment.
• Accuracy class 0.5 supports precise current and energy measurement.
• 5 VA rated output at class 0.5 for accurate metering applications.
• Solid-core through-primary construction provides a robust current sensing solution.
• Designed according to IEC 61869-2 for instrument transformers.
• Compact dimensions make it suitable for integration into electrical panels and switchboards.

Key Features

• ABB CT1M current transformer series.
• 250 A rated primary current.
• 5 A rated secondary current.
• 250:5 current transformation ratio.
• Accuracy class 0.5.
• 5 VA rated output at class 0.5.
• 5 VA rated output at class 1.
• 7.5 VA rated output at class 3.
• 50–60 Hz rated frequency.
• IP20 protection rating.
• Solid-core through-primary current transformer construction.
• Designed for indirect measurement with a standard 5 A secondary output.

Reliable Indirect Measurement for Electrical Systems

Current transformers allow meters and measuring instruments to monitor electrical circuits carrying currents above their direct measurement range. The transformer produces a proportional secondary current, allowing electrical parameters to be measured without routing the full primary circuit current through the connected measuring instrument.

The ABB CT1M-2 250 converts a nominal 250 A primary current into a 5 A secondary current. Its class 0.5 accuracy, solid-core through-primary construction and compact dimensions make it suitable for integrating accurate indirect current measurement into commercial and industrial electrical distribution and energy monitoring systems.

Typical Applications

• Electrical energy metering systems.
• Commercial and industrial distribution panels.
• Electrical switchboards and control cabinets.
• Indirect current measurement applications.
• Energy monitoring and management systems.
• Current measurement with compatible network analysers and meters.
• Power monitoring and electrical instrumentation.
• Panel-building and electrical distribution applications.