2CSG280765R1000 ABB CT1M-S-80 250 Current Transformer 250 A/5 A

Why Choose the ABB CT1M-S-80 250 Current Transformer?

The ABB CT1M-S-80 250, order code 2CSG280765R1000, is a 250 A/5 A through-primary current transformer designed for indirect measurement of electrical parameters in metering, monitoring and energy management applications. Part of ABB's Metering Accessories range, it transforms a nominal 250 A primary current into a standardised 5 A secondary current for compatible electricity meters, network analysers and measuring instruments.

As part of the ABB CT1M-S-80 series, the CT1M-S-80 250 is designed for indirect current measurement in electrical distribution systems. ABB specifies the CT1M range according to IEC 61869-2, providing a practical solution for transforming higher primary currents into standard 5 A secondary signals that can be measured by compatible instrumentation.

With a 250 A rated primary current, 5 A rated secondary current and accuracy class 0.5, the CT1M-S-80 250 provides a 250:5 transformation ratio. It delivers 1 VA at class 0.5, 2.5 VA at class 1 and 3.75 VA at class 3, while the CT1M-S-80 series through-primary opening accommodates vertical busbars up to 85 × 55 mm.

Key Advantages

• Designed for indirect electrical current measurement in metering and monitoring systems.
• 250 A/5 A current ratio for compatible measuring equipment.
• Accuracy class 0.5 supports accurate current and energy measurement.
• 1 VA rated output at class 0.5.
• CT1M-S-80 series through-primary opening accommodates vertical busbars up to 85 × 55 mm.
• 50–60 Hz rated frequency for standard AC electrical networks.
• IP20 protection for installation within suitable electrical enclosures.

Key Features

• ABB CT1M-S-80 current transformer series.
• Through-primary construction.
• 250 A rated primary current.
• 5 A rated secondary current.
• 250:5 current transformation ratio.
• Accuracy class 0.5.
• 1 VA rated output at class 0.5.
• 2.5 VA rated output at class 1.
• 3.75 VA rated output at class 3.
• 50–60 Hz rated frequency.
• IP20 protection rating.
• Designed for indirect measurement with compatible meters, network analysers and electrical instrumentation.

Accurate Indirect Measurement for Electrical Distribution 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-S-80 250 converts a nominal 250 A primary current into a 5 A secondary current. Its class 0.5 accuracy and CT1M-S-80 through-primary format make it suitable for indirect current measurement in distribution boards, switchboards, energy monitoring systems and other installations where compatible 5 A measuring instrumentation is used.

Typical Applications

• Electrical energy metering systems.
• Commercial and industrial power distribution installations.
• Distribution boards and electrical switchboards.
• Indirect measurement of circuits with a 250 A nominal current.
• Energy monitoring and management systems.
• Current measurement with compatible network analysers, meters and instrumentation.
• Vertical busbar current measurement.
• Industrial panel-building and electrical instrumentation applications.