2CSG280845R1000 ABB CT1M-S-120 1500 Current Transformer 1500/5 A

Why Choose the ABB CT1M-S-120 1500 Current Transformer?

The ABB CT1M-S-120 1500 is a high-capacity 1500/5 A current transformer designed for indirect measurement of electrical current in low-voltage metering and energy-monitoring systems. As part of the ABB CT1M current transformer series, it transforms high primary currents into a standardised 5 A secondary current suitable for compatible ammeters, multifunction meters and energy meters.

Designed in accordance with IEC 61869-2, the CT1M-S-120 1500 provides a best accuracy class of 0.5 for dependable electrical metering. Its through-primary construction is specifically designed for large vertical busbars, making it suitable for main distribution switchboards, industrial panels and energy-monitoring installations handling substantial electrical loads.

With a rated primary current of 1500 A, rated secondary current of 5 A and rated frequency of 50–60 Hz, the CT1M-S-120 1500 provides rated outputs of 20 VA at Class 0.5, 45 VA at Class 1 and 60 VA at Class 3. The CT1M-S-120 format accommodates a vertical busbar section up to 125 × 85 mm, providing generous clearance for high-current distribution conductors.

Key Advantages

• High-capacity 1500/5 A current transformation for indirect electrical measurement.
• Best accuracy class 0.5 for precise metering applications.
• 20 VA rated output at Class 0.5.
• Higher burdens supported with 45 VA at Class 1 and 60 VA at Class 3.
• Designed in accordance with IEC 61869-2.
• Through-primary design optimised for large vertical busbar installations.
• Large opening accommodates a vertical busbar section up to 125 × 85 mm.

Key Features

• ABB CT1M-S-120 current transformer series.
• 1500 A rated primary current.
• 5 A rated secondary current.
• 1500/5 A transformation ratio.
• Accuracy class 0.5 with 20 VA rated output.
• 45 VA rated output at Class 1.
• 60 VA rated output at Class 3.
• 50–60 Hz rated frequency.
• IP20 protection rating.
• Through-primary construction for large vertical busbars.

Reliable Current Measurement for Electrical Metering

Current transformers allow measuring equipment to monitor high electrical currents without routing the full primary current directly through the measuring instrument. The ABB CT1M-S-120 1500 converts a 1500 A primary current proportionally to a standard 5 A secondary signal, enabling compatible ammeters, multifunction meters and energy meters to perform indirect measurement of electrical parameters.

The CT1M range is designed for electrical distribution and energy-efficiency applications where accurate and dependable current measurement is required. The CT1M-S-120 through-primary format provides a large opening for substantial vertical busbars, while its Class 0.5 accuracy and defined VA ratings support correct matching with compatible metering circuits in high-current commercial and industrial installations.

Typical Applications

• High-current electrical energy metering systems.
• Main low-voltage distribution switchboards.
• Industrial electrical distribution panels.
• Indirect current measurement with ammeters.
• Multifunction electrical measuring instruments.
• Energy monitoring and management systems.
• Commercial and industrial vertical busbar installations.