2CSG280825R1000 ABB CT1M-S-120 800 Current Transformer 800 A/5 A

Why Choose the ABB CT1M-S-120 800 Current Transformer?

The ABB CT1M-S-120 800, order code 2CSG280825R1000, is an 800 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 800 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-120 series, the CT1M-S-120 800 provides a large through-primary opening for substantial vertical busbars. ABB's CT1M range is designed according to IEC 61869-2, providing a dedicated solution for transforming primary currents into standard 5 A secondary currents for indirect measurement of electrical network parameters.

With a rated primary current of 800 A, rated secondary current of 5 A and best accuracy class 0.5, the CT1M-S-120 800 provides an 800:5 transformation ratio. It delivers 7.5 VA at class 0.5, 10 VA at class 1 and 12.5 VA at class 3, while its through-primary opening accommodates vertical busbars up to 125 × 85 mm.

Key Advantages

• Designed for indirect electrical current measurement in metering and monitoring systems.
• 800 A/5 A current ratio for compatible measuring equipment.
• Accuracy class 0.5 supports accurate current and energy measurement.
• 7.5 VA rated output at class 0.5.
• Large through-primary opening accommodates vertical busbars up to 125 × 85 mm.
• 50–60 Hz rated frequency for standard AC electrical networks.
• IP20 protection for installation within suitable electrical enclosures.

Key Features

• ABB CT1M-S-120 current transformer series.
• Through-primary construction.
• 800 A rated primary current.
• 5 A rated secondary current.
• 800:5 current transformation ratio.
• Best accuracy class 0.5.
• 7.5 VA rated output at class 0.5.
• 10 VA rated output at class 1.
• 12.5 VA rated output at class 3.
• 50–60 Hz rated frequency.
• IP20 protection rating.
• Large 125 × 85 mm maximum vertical busbar section.

Accurate Indirect Measurement for Large-Busbar 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, enabling electrical parameters to be measured without routing the full primary circuit current through the connected measuring instrument.

The ABB CT1M-S-120 800 converts a nominal 800 A primary current into a 5 A secondary current. Its class 0.5 accuracy, 7.5 VA class 0.5 output and large 125 × 85 mm vertical busbar opening make it particularly suitable for indirect current measurement in distribution boards, switchboards, power distribution systems and energy management installations using substantial busbar conductors.

Typical Applications

• Electrical energy metering systems.
• Commercial and industrial power distribution installations.
• Main and sub-distribution switchboards.
• Indirect measurement of circuits with an 800 A nominal current.
• Energy monitoring and management systems.
• Current measurement with compatible network analysers, meters and instrumentation.
• Large vertical busbar current measurement.
• Industrial panel-building and electrical instrumentation applications.